Eurotherm 2704 User manual

2700
User
Manual
2704 Process Controller
HA026933/7
Nov 2012

© 2012 Eurotherm Limited
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specification in this document may therefore be changed without notice. The information in this
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2704 Controller Engineering Handbook
Part No HA026933 Issue 7.0 Nov-12 CN29089 1
MODEL 2704 CONTROLLER
ENGINEERING HANDBOOK
List of Chapters
1. CHAPTER 1 INTRODUCTION ...................................................................................................12
2. CHAPTER 2 INSTALLATION .....................................................................................................14
3. CHAPTER 3 OPERATION ..........................................................................................................36
4. CHAPTER 4 FUNCTION BLOCKS............................................................................................49
5. CHAPTER 5 SOFT WIRING........................................................................................................50
6. CHAPTER 6 ACCESS LEVELS....................................................................................................56
7. CHAPTER 7 INSTRUMENT CONFIGURATION .......................................................................58
8. CHAPTER 8 PROGRAMMER CONFIGURATION....................................................................71
9. CHAPTER 9 DIGITAL PROGRAMMER .................................................................................. 115
10. CHAPTER 10 ALARM OPERATION....................................................................................... 119
11. CHAPTER 11 LOOP SET UP................................................................................................... 134
12. CHAPTER 12 TUNING ............................................................................................................ 168
13. CHAPTER 13 CONTROLLER APPLICATIONS...................................................................... 179
14. CHAPTER 14 INPUT OPERATORS ........................................................................................ 206
15. CHAPTER 15 TIMER, CLOCK, TOTALISER, OPERATION .................................................... 215
16. CHAPTER 16 ADVANCED FUNCTIONS............................................................................... 225
17. CHAPTER 17 USER PAGES .................................................................................................... 234
18. CHAPTER 18 ANALOGUE AND MULTIPLE OPERATORS.................................................. 247
19. CHAPTER 19 LOGIC OPERATORS........................................................................................ 253
20. CHAPTER 20 DIGITAL COMMUNICATIONS....................................................................... 256
21. CHAPTER 21 2704 MASTER COMMUNICATIONS ............................................................. 263
22. CHAPTER 22 STANDARD IO ................................................................................................. 273
23. CHAPTER 23 MODULE IO ..................................................................................................... 284
24. CHAPTER 24 TRANSDUCER SCALING................................................................................. 316
25. CHAPTER 25 IO EXPANDER.................................................................................................. 326
26. CHAPTER 26 DIAGNOSTICS ................................................................................................. 328
27. CHAPTER 27 CALIBRATION.................................................................................................. 330
28. CHAPTER 28 BOILER CONTROL .......................................................................................... 343
29. APPENDIX A ORDER CODE .................................................................................................. 360
30. APPENDIX B SAFETY AND EMC INFORMATION............................................................... 362
31. APPENDIX C TECHNICAL SPECIFICATION......................................................................... 365
32. APPENDIX D PARAMETER UNITS AND ADDRESSES........................................................ 374

Engineering Handbook 2704 Controller
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Contents
1. CHAPTER 1 INTRODUCTION................................................................................................... 12
1.1 ABOUT THIS MANUAL.................................................................................................................................12
1.1.1 The Structure Of This Manual ..................................................................................................................................................12
1.2 WHAT IS 2704...............................................................................................................................................13
2. CHAPTER 2 INSTALLATION ..................................................................................................... 14
2.1 MECHANICAL INSTALLATION....................................................................................................................14
2.1.1 Positioning ..................................................................................................................................................................................14
2.1.2 Outline dimensions Model 2704.............................................................................................................................................14
2.1.3 Mounting the Controller...........................................................................................................................................................15
2.1.4 Unplugging and Plugging in the Controller .........................................................................................................................15
2.2 I/O MODULES...............................................................................................................................................16
2.2.1 To Add or Change Modules ....................................................................................................................................................16
2.3 WIRING..........................................................................................................................................................17
2.3.1 Electrical Connections ..............................................................................................................................................................17
2.3.2 Rear Terminal Layout ................................................................................................................................................................17
2.4 Rear Terminals ..............................................................................................................................................18
2.5 STANDARD CONNECTIONS.......................................................................................................................19
2.5.1 Power Supply Wiring.................................................................................................................................................................19
2.5.2 Relay Output...............................................................................................................................................................................19
2.5.3 Sensor Input Connections........................................................................................................................................................20
2.5.4 Analogue Input Connections...................................................................................................................................................21
2.5.5 I/O Expander (or Additional Digital Input) ............................................................................................................................22
2.5.6 Digital I/O....................................................................................................................................................................................23
2.6 OPTIONAL PLUG IN MODULE CONNECTIONS .......................................................................................24
2.6.1 Digital Communications Connections ...................................................................................................................................24
2.6.2 DeviceNet®Wiring.....................................................................................................................................................................26
2.6.3 Ethernet Connections ...............................................................................................................................................................28
2.6.4 I/O Modules................................................................................................................................................................................29
2.7 TO CONNECT ZIRCONIA (DUAL SIGNAL) PROBE ...................................................................................34
2.7.1 Zirconia Probe Screening.........................................................................................................................................................35
3. CHAPTER 3 OPERATION.......................................................................................................... 36
3.1 OPERATOR INTERFACE - OVERVIEW ........................................................................................................36
3.1.1 The Operator Buttons ...............................................................................................................................................................37
3.1.2 Status Messages.........................................................................................................................................................................38
3.2 PARAMETERS AND HOW TO ACCESS THEM...........................................................................................39
3.2.1 Pages ...........................................................................................................................................................................................39
3.3 NAVIGATION OVERVIEW............................................................................................................................40
3.3.1 To Select a Page Header ..........................................................................................................................................................40
3.3.2 To Navigate to a Parameter from a Page Header.................................................................................................................41
3.3.3 To Change Next Parameter in the List....................................................................................................................................42
3.3.4 To Change Any Parameter in the List .....................................................................................................................................42
3.4 BACKSCROLL ...............................................................................................................................................42
3.5 PARAMETER VALUES...................................................................................................................................43
3.5.1 Confirmation Mechanism .........................................................................................................................................................44
3.5.2 Invalid key actions......................................................................................................................................................................44
3.6 PARAMETER TABLES ...................................................................................................................................45
3.7 PARAMETER AVAILABILITY AND ALTERABILITY ......................................................................................45
3.8 NAVIGATION DIAGRAM..............................................................................................................................46
4. CHAPTER 4 FUNCTION BLOCKS ........................................................................................... 49
4.1 What is a Function Block?............................................................................................................................49
4.1.1 Inputs ...........................................................................................................................................................................................49
4.1.2 Outputs........................................................................................................................................................................................49
4.1.3 Settings........................................................................................................................................................................................49
5. CHAPTER 5 SOFT WIRING ....................................................................................................... 50
5.1 WHAT IS SOFT WIRING?..............................................................................................................................50
5.1.1 An Example of Soft Wiring .......................................................................................................................................................51
5.1.2 Configuration of the Simple PID Loop ...................................................................................................................................52
6. CHAPTER 6 ACCESS LEVELS ................................................................................................... 56
6.1 THE DIFFERENT ACCESS LEVELS...............................................................................................................56
6.2 PASSCODES .................................................................................................................................................56
6.3 TO ENTER CONFIGURATION LEVEL.......................................................................................................... 57
6.4 TO ENTER NEW PASSCODES.....................................................................................................................57
6.5 TO EXIT CONFIGURATION LEVEL..............................................................................................................57

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7. CHAPTER 7 INSTRUMENT CONFIGURATION .......................................................................58
7.1 WHAT IS INSTRUMENT CONFIGURATION? ............................................................................................. 58
7.1.1 To Select the Instrument Configuration Pages .....................................................................................................................58
7.2 TO CONFIGURE CONTROLLER OPTIONS................................................................................................ 59
7.2.1 INSTRUMENT Options Page....................................................................................................................................................59
7.2.2 INSTRUMENT Info Page ...........................................................................................................................................................60
7.2.3 INSTRUMENT Units Page .........................................................................................................................................................61
7.2.4 INSTRUMENT Display Page .....................................................................................................................................................61
7.2.5 INSTRUMENT Page Promote Page.........................................................................................................................................63
7.2.6 INSTRUMENT User Text Page..................................................................................................................................................64
7.2.7 INSTRUMENT Summary Page .................................................................................................................................................65
7.2.8 INSTRUMENT Standby Page....................................................................................................................................................67
7.3 USER TEXT EXAMPLES................................................................................................................................ 68
7.3.1 To Re-Name Loop 1 to Zone 1 ................................................................................................................................................68
7.3.2 To Re-Name User Alarm 1 and Provide a Message.............................................................................................................68
7.3.3 To Re-Name Module 1 to be called Heat Output ................................................................................................................68
7.3.4 To Rename a Digital Input and show in the Summary Page...............................................................................................69
7.3.5 To Assign Custom Units ...........................................................................................................................................................70
7.3.6 To Customise the Power Up Display ......................................................................................................................................70
8. CHAPTER 8 PROGRAMMER CONFIGURATION....................................................................71
8.1 WHAT IS SETPOINT PROGRAMMING ?..................................................................................................... 72
8.1.1 Synchronous Programmer .......................................................................................................................................................72
8.1.2 Asynchronous Programmer.....................................................................................................................................................73
8.2 SETPOINT PROGRAMMER DEFINITIONS.................................................................................................. 74
8.2.1 Run ...............................................................................................................................................................................................74
8.2.2 Hold .............................................................................................................................................................................................74
8.2.3 Reset ............................................................................................................................................................................................74
8.2.4 Servo............................................................................................................................................................................................74
8.2.5 Hot Start ......................................................................................................................................................................................74
8.3 PROGRAMMER TYPES................................................................................................................................. 75
8.3.1 Time To Target Programmer ...................................................................................................................................................75
8.3.2 Ramp Rate Programmer...........................................................................................................................................................75
8.4 SEGMENT TYPES ......................................................................................................................................... 75
8.4.1 Profile...........................................................................................................................................................................................75
8.4.2 Go Back To Segment ................................................................................................................................................................76
8.4.3 End Segment..............................................................................................................................................................................76
8.4.4 Wait..............................................................................................................................................................................................77
8.5 POWER FAIL RECOVERY............................................................................................................................. 78
8.6 HOLDBACK (GUARANTEED SOAK)........................................................................................................... 79
8.7 PROGRAM USER VALUES ........................................................................................................................... 80
8.7.1 Program User Value Enumerations.........................................................................................................................................80
8.8 External Program Inputs.............................................................................................................................. 80
8.9 PROFILE LOCK ............................................................................................................................................. 80
8.10 Example: TO CONFIGURE A SYNCHRONOUS PROGRAMMER ............................................................ 81
8.11 Example: TO CONFIGURE SYNCHRONOUS PROGRAMMER TYPE ...................................................... 82
8.11.1 PROGRAM EDIT Options Page ..........................................................................................................................................82
8.12 PROGRAMMER WIRING.............................................................................................................................. 84
8.12.1 Programmer Function Block...............................................................................................................................................84
8.12.2 PROGRAM EDIT Wiring Page.............................................................................................................................................85
8.13 TO CREATE OR EDIT A PROGRAM............................................................................................................ 86
8.14 Example: To Access the Program Edit pages........................................................................................... 86
8.14.1 PROGRAM EDIT (Program Page) Parameters .................................................................................................................86
8.14.2 Fine and Coarse Holdback .................................................................................................................................................87
8.15 Example: To Set Up Each Segment of a Program.................................................................................... 88
8.15.1 PROGRAM EDIT (Segment) Parameters...........................................................................................................................88
8.16 TO RUN A SYNCHRONOUS PROGRAM.................................................................................................... 90
8.17 TO HOLD A PROGRAM............................................................................................................................... 90
8.18 TO RESET A PROGRAM............................................................................................................................... 90
8.18.1 From Digital Inputs ..............................................................................................................................................................90
8.18.2 From Digital Communications ...........................................................................................................................................90
8.18.3 From the PROGRAM RUN Page.........................................................................................................................................90
8.19 Example: To View the State of a Running Program ................................................................................. 91
8.19.1 Run Parameter Tables .........................................................................................................................................................91
8.20 PROGRAMMER WIRING EXAMPLES .......................................................................................................... 94
8.20.1 One Profile, Three Loops....................................................................................................................................................94
8.20.2 Two Profiles, Two Loops .....................................................................................................................................................95
8.21 Asynchronous Programmer ........................................................................................................................ 96
8.22 Program Groups .......................................................................................................................................... 97
8.23 Example: TO CONFIGURE AN ASYNCHRONOUS PROGRAMMER....................................................... 98
8.24 Example: TO CONFIGURE ASYNCHRONOUS PROGRAMMER TYPE ................................................... 99
8.24.1 Program GROUP Options Page.........................................................................................................................................99
8.24.2 PROGRAM GROUPS Wiring Page ...................................................................................................................................100

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8.24.3 PROGRAM GROUPS Group Edit Page.......................................................................................................................... 100
8.25 PROFILE SETPOINT PAGES.......................................................................................................................101
8.25.1 PSP1 (2 or 3) PROFILE Options ....................................................................................................................................... 101
8.25.2 PSP1 (2 or 3) PROFILE Wiring.......................................................................................................................................... 103
8.25.3 PSP1 (2 OR 3) PROFILE Run General Pages.................................................................................................................. 103
8.25.4 PSP1 (2 OR 3) PROFILE Run Segment Pages ................................................................................................................ 106
8.25.5 PSP1 (2 OR 3) PROFILE Program Edit Parameters ...................................................................................................... 107
8.25.6 PSP1 (2 or 3) PROFILE Segment Parameters ................................................................................................................ 108
8.26 Example: To set up and run program groups.........................................................................................110
8.27 Example: To Copy a Program ..................................................................................................................111
8.28 Example: To Insert a Segment into a Program .......................................................................................112
8.29 Programmer error messages.....................................................................................................................112
8.30 runNING an asynchronous programmer..................................................................................................112
8.31 Example: To Run a Program Using the PROG Button............................................................................113
8.31.1 Asynchronous Programmer Status Bar.......................................................................................................................... 114
9. CHAPTER 9 DIGITAL PROGRAMMER...................................................................................115
9.1 WHAT IS THE DIGITAL PROGRAMMER?..................................................................................................115
9.2 TO EDIT THE DIGITAL PROGRAMMER ....................................................................................................116
9.2.1 Digital Program Edit Page..................................................................................................................................................... 116
9.2.2 Digital Program 1 to 4 Page.................................................................................................................................................. 117
9.3 POWER FAIL RECOVERY ...........................................................................................................................117
9.4 Cascade Trim Mode – Earlier Controllers.................................................................................................118
9.4.1 Cascade Parameters (prior to April 2001) .......................................................................................................................... 118
10. CHAPTER 10 ALARM OPERATION .......................................................................................119
10.1 DEFINITION OF ALARMS AND EVENTS ..................................................................................................119
10.1.1 Customisable Parameter Names .................................................................................................................................... 119
10.2 TYPES OF ALARM USED IN 2704 CONTROLLER ....................................................................................120
10.2.1 Full Scale High ................................................................................................................................................................... 120
10.2.2 Full Scale Low..................................................................................................................................................................... 120
10.2.3 Deviation High Alarm ....................................................................................................................................................... 120
10.2.4 Deviation Low Alarm......................................................................................................................................................... 121
10.2.5 Deviation Band .................................................................................................................................................................. 121
10.2.6 Rate Of Change Alarm (Negative Direction)................................................................................................................. 122
10.2.7 Rate Of Change Alarm (Positive Direction)................................................................................................................... 122
10.3 BLOCKING ALARMS ..................................................................................................................................123
10.3.1 Full Scale Low With Blocking........................................................................................................................................... 123
10.3.2 Full Scale High Alarm With Blocking.............................................................................................................................. 123
10.3.3 Deviation Band With Blocking......................................................................................................................................... 123
10.4 LATCHING ALARMS...................................................................................................................................124
10.4.1 Latched Alarm (Full Scale High) - Automatic ................................................................................................................ 124
10.4.2 Latched Alarm (Full Scale High) - Manual...................................................................................................................... 124
10.4.3 Grouped Alarms ................................................................................................................................................................ 125
10.5 HOW ALARMS ARE INDICATED ...............................................................................................................125
10.5.1 Alarm Delay Time .............................................................................................................................................................. 125
10.6 TO CONFIGURE AN ALARM .....................................................................................................................126
10.7 ALARM TABLES...........................................................................................................................................127
10.7.1 ALARMS (Summary Page) ................................................................................................................................................ 128
10.7.2 ALARMS LP1 (2 or 3) Page Parameters.......................................................................................................................... 129
10.7.3 ALARMS (PV Input Page) Parameters............................................................................................................................. 130
10.7.4 ALARMS (An Input Page) Parameters ............................................................................................................................ 130
10.7.5 ALARMS (Module 1,3, 4, 5 & 6 Page) Parameters........................................................................................................ 130
10.7.6 ALARMS (User 1 to 8 Page) Parameters ........................................................................................................................ 131
10.8 ALARM WIRING EXAMPLES ......................................................................................................................132
10.8.1 Control Loop With High and Low Alarms...................................................................................................................... 132
10.8.2 Loop Alarm Inhibited if Programmer not in Run .......................................................................................................... 133
11. CHAPTER 11 LOOP SET UP....................................................................................................134
11.1 WHAT IS LOOP SET UP..............................................................................................................................134
11.1.1 LOOP SET UP (Options page) ......................................................................................................................................... 135
11.2 SINGLE LOOP CONTROL..........................................................................................................................138
11.2.1 LOOP SET UP (Wiring page) SINGLE LOOP ................................................................................................................. 138
11.3 SETPOINT DEFINITION..............................................................................................................................139
11.3.1 Setpoint Function Block ................................................................................................................................................... 139
11.3.2 Setpoint Parameters.......................................................................................................................................................... 140
11.3.3 LP1 SETUP (SP Aux) Page................................................................................................................................................. 141
11.4 PID CONTROL ............................................................................................................................................142
11.4.1 Proportional Term ............................................................................................................................................................. 142
11.4.2 Integral Term...................................................................................................................................................................... 142
11.4.3 Derivative Term ................................................................................................................................................................. 142
11.4.4 High and Low Cutback ..................................................................................................................................................... 142
11.4.5 PID Block Diagram ............................................................................................................................................................ 143
11.4.6 Remote (External) OP Feedback..................................................................................................................................... 143

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11.4.7 Analogue Value ..................................................................................................................................................................143
11.5 GAIN SCHEDULING................................................................................................................................... 144
11.5.1 To Configure Gain Scheduling:-......................................................................................................................................145
11.5.2 PID Parameters ...................................................................................................................................................................145
11.5.3 PID (Aux) Parameters.........................................................................................................................................................147
11.6 OUTPUT PARAMETERS ............................................................................................................................. 148
11.6.1 Table of Output Parameters.............................................................................................................................................148
11.7 MOTORISED VALVE CONTROL ............................................................................................................... 149
11.7.1 Motor Parameters...............................................................................................................................................................149
11.8 DIAGNOSTICS............................................................................................................................................ 150
11.8.1 Diagnostic Page .................................................................................................................................................................150
11.9 DISPLAY ...................................................................................................................................................... 151
11.9.1 Display Page .......................................................................................................................................................................151
11.10 CASCADE CONTROL............................................................................................................................ 152
11.10.1 Overview..............................................................................................................................................................................152
11.10.2 Full Scale Cascade Mode..................................................................................................................................................152
11.10.3 Trim Mode...........................................................................................................................................................................153
11.10.4 Auto/Manual Operation in Cascade ...............................................................................................................................153
11.10.5 Cascade Controller Block Diagrams ...............................................................................................................................154
11.10.6 LOOP SETUP (Wiring page) for Cascade Loop.............................................................................................................155
11.10.7 Cascade Parameters..........................................................................................................................................................156
11.10.8 Cascade Wiring Example..................................................................................................................................................157
11.11 RATIO CONTROL .................................................................................................................................. 158
11.11.1 Overview..............................................................................................................................................................................158
11.11.2 Basic Ratio Control.............................................................................................................................................................158
11.11.3 Controller Configured For Ratio......................................................................................................................................159
11.11.4 Ratio Parameters ................................................................................................................................................................160
11.11.5 Ratio Wiring Example ........................................................................................................................................................161
11.12 OVERIDE CONTROL ............................................................................................................................. 162
11.12.1 Overview..............................................................................................................................................................................162
11.12.2 Simple Override .................................................................................................................................................................162
11.12.3 Sensor Break Action...........................................................................................................................................................163
11.12.4 Sensor Break Type = Output (0) ......................................................................................................................................163
11.12.5 Sensor Break Type = Hold (1) ..........................................................................................................................................163
11.12.6 Issues with Sensor Break...................................................................................................................................................163
11.12.7 Downscale ...........................................................................................................................................................................163
11.12.8 Upscale ................................................................................................................................................................................163
11.12.9 Controller Configured For Override...............................................................................................................................164
11.12.10 Override Parameters ....................................................................................................................................................165
11.12.11 Override Wiring Example............................................................................................................................................166
11.13 LOOP2 SET UP....................................................................................................................................... 167
11.14 LOOP3 SET UP....................................................................................................................................... 167
12. CHAPTER 12 TUNING ............................................................................................................ 168
12.1 WHAT IS TUNING....................................................................................................................................... 168
12.2 AUTOMATIC TUNING ............................................................................................................................... 168
12.2.1 One-shot Tuning ................................................................................................................................................................168
12.3 TO AUTOTUNE CONTOL LOOP LP1 ....................................................................................................... 169
12.3.1 Carbon Potential Control..................................................................................................................................................170
12.3.2 Autotune Parameters.........................................................................................................................................................171
12.3.3 To View the State of Autotune .........................................................................................................................................171
12.4 MANUAL TUNING...................................................................................................................................... 172
12.4.1 Setting the cutback values ................................................................................................................................................172
12.4.2 Integral action and manual reset .....................................................................................................................................173
12.4.3 Valve Position Control .......................................................................................................................................................173
12.5 TUNING WHEN GAIN SCHEDULING IS USED ........................................................................................ 174
12.5.1 Tuning Procedure ..............................................................................................................................................................174
12.6 CASCADE TUNING.................................................................................................................................... 175
12.6.1 To Tune a Full Scale Cascade Loop ................................................................................................................................176
12.6.2 To Tune a Trim mode Cascade Loop..............................................................................................................................177
13. CHAPTER 13 CONTROLLER APPLICATIONS...................................................................... 179
13.1 ZIRCONIA - CARBON POTENTIAL CONTROL........................................................................................ 180
13.1.1 Temperature Control.........................................................................................................................................................180
13.1.2 Carbon Potential Control..................................................................................................................................................180
13.1.3 Sooting Alarm.....................................................................................................................................................................180
13.1.4 Automatic Probe Cleaning ...............................................................................................................................................180
13.1.5 Endothermic Gas Correction............................................................................................................................................180
13.1.6 Example of Carbon Potential Controller Connections.................................................................................................181
13.2 TO VIEW AND ADJUST ZIRCONIA PARAMETERS.................................................................................. 182
13.2.1 Zirconia Parameters ...........................................................................................................................................................182
13.2.2 Wiring Page.........................................................................................................................................................................184
13.3 ZIRCONIA WIRING EXAMPLE................................................................................................................... 184
13.3.1 The Zirconia Function Block .............................................................................................................................................184
13.3.2 Configuration of a Carbon Potential Control Loop ......................................................................................................185

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13.3.3 Probe Impedance.............................................................................................................................................................. 186
13.4 HUMIDITY CONTROL.................................................................................................................................187
13.4.1 Overview............................................................................................................................................................................. 187
13.4.2 Example Of Humidity Controller Connections............................................................................................................. 187
13.4.3 Temperature Control Of An Environmental Chamber................................................................................................ 188
13.4.4 Humidity Control Of An Environmental Chamber....................................................................................................... 188
13.5 TO VIEW AND ADJUST HUMIDITY PARAMETERS ..................................................................................189
13.5.1 Humidity Options Parameters ......................................................................................................................................... 189
13.5.2 Wiring Page........................................................................................................................................................................ 189
13.6 HUMIDITY WIRING EXAMPLE ...................................................................................................................190
13.6.1 The Humidity Function Block .......................................................................................................................................... 190
13.6.2 Configuration of a Humidity Control Loop ................................................................................................................... 190
13.7 Vacuum Controller .....................................................................................................................................192
13.7.1 Vacuum Chamber Example ............................................................................................................................................. 192
13.8 VACUUM CONTROLLER FUNCTIONALITY .............................................................................................193
13.8.1 Setpoints ............................................................................................................................................................................. 193
13.8.2 Low Vacuum Gauge.......................................................................................................................................................... 193
13.8.3 High Vacuum Gauge......................................................................................................................................................... 193
13.8.4 Gauge Linearisation .......................................................................................................................................................... 193
13.8.5 Roughing Pump Timeout ................................................................................................................................................. 194
13.8.6 Leak Detection................................................................................................................................................................... 194
13.8.7 Gauge Switchover ............................................................................................................................................................. 194
13.9 WIRING CONNECTIONS ...........................................................................................................................195
13.10 SWITCH ON............................................................................................................................................196
13.11 OPERATION ...........................................................................................................................................197
13.11.1 To Access the Vacuum Controller Parameters ............................................................................................................. 197
13.12 PARAMETER TABLES.............................................................................................................................198
13.12.1 High Vacuum Parameter Tables...................................................................................................................................... 198
13.12.2 Low Vacuum Parameter Tables....................................................................................................................................... 198
13.12.3 Backing Vacuum Parameter Tables................................................................................................................................ 198
13.12.4 Gauge Switching Parameter Tables ............................................................................................................................... 199
13.12.5 Setpoint Parameter Tables .............................................................................................................................................. 199
13.12.6 Pump Control Parameter Tables..................................................................................................................................... 199
13.12.7 Leak Detect Parameter Tables ........................................................................................................................................ 200
13.12.8 Vacuum display Parameter Tables ................................................................................................................................. 200
13.13 CONFIGURATION LEVEL......................................................................................................................201
13.13.1 To Configure the Vacuum Summary as the HOME Page............................................................................................ 201
13.13.2 To Customise the Vacuum Summary Page ................................................................................................................... 202
13.13.3 Vacuum Function Block.................................................................................................................................................... 202
13.14 VACUUM CONTROLLER WIRING EXAMPLES.....................................................................................203
13.14.1 Simple Temperature and Vacuum Control ................................................................................................................... 203
13.14.2 To Scale Vacuum Readout in Other Units ..................................................................................................................... 205
14. CHAPTER 14 INPUT OPERATORS.........................................................................................206
14.1 WHAT ARE INPUT OPERATORS................................................................................................................206
14.2 CUSTOM LINEARISATION.........................................................................................................................207
14.2.1 Compensation for Sensor Non-Linearities .................................................................................................................... 207
14.3 TO VIEW AND ADJUST INPUT OPERATOR PARAMETERS ....................................................................208
14.3.1 Input Operator Custom Linearisation Parameters ....................................................................................................... 208
14.4 THERMOCOUPLE/PYROMETER SWITCHING..........................................................................................209
14.4.1 Input Operators Switch Over Parameters ..................................................................................................................... 209
14.5 TO SET UP INPUT OPERATORS (MONITOR) ...........................................................................................210
14.5.1 Input Operator Monitor Parameters............................................................................................................................... 210
14.6 BCD INPUT..................................................................................................................................................210
14.6.1 Main Features..................................................................................................................................................................... 210
14.6.2 BCD Parameters ................................................................................................................................................................ 211
14.7 INPUT OPERATORS WIRING EXAMPLES .................................................................................................212
14.7.1 Switch Over Loop With Custom Linearised Input ........................................................................................................ 212
14.7.2 Configuring the BCD Input to Select a Program.......................................................................................................... 213
14.7.3 Holdback Duration Timer................................................................................................................................................. 214
15. CHAPTER 15 TIMER, CLOCK, TOTALISER, OPERATION.....................................................215
15.1 WHAT ARE TIMER BLOCKS? .....................................................................................................................215
15.2 TIMER TYPES...............................................................................................................................................216
15.2.1 On Pulse Timer Mode....................................................................................................................................................... 216
15.2.2 Off Delay Timer Mode ...................................................................................................................................................... 217
15.2.3 One Shot Timer Mode...................................................................................................................................................... 218
15.2.4 Compressor or Minimum On Timer Mode.................................................................................................................... 219
15.3 TO VIEW AND ADJUST TIMER PARAMETERS.........................................................................................220
15.3.1 Timer Parameters .............................................................................................................................................................. 220
15.4 THE CLOCK.................................................................................................................................................221
15.4.1 Clock Parameters .............................................................................................................................................................. 221
15.5 TIME BASED ALARMS................................................................................................................................222
15.5.1 Timer Alarm Parameters................................................................................................................................................... 222

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15.6 TOTALISERS ............................................................................................................................................... 223
15.6.1 Totaliser Parameters ..........................................................................................................................................................223
15.7 APPLICATION EXAMPLE........................................................................................................................... 224
15.7.1 Compressor Timer .............................................................................................................................................................224
16. CHAPTER 16 ADVANCED FUNCTIONS............................................................................... 225
16.1 PATTERN GENERATOR ............................................................................................................................. 225
16.1.1 Example: Programmer Event Outputs...........................................................................................................................225
16.2 ANALOGUE SWITCHES............................................................................................................................. 227
16.2.1 To Set up an Analogue Switch .........................................................................................................................................227
16.3 USER VALUES ............................................................................................................................................. 228
16.3.1 To Access User Values.......................................................................................................................................................228
16.3.2 User Values Parameter Table ...........................................................................................................................................228
16.4 USER MESSAGES ....................................................................................................................................... 229
16.4.1 To Configure A User Message .........................................................................................................................................229
16.5 USER SWITCHES ........................................................................................................................................ 230
16.5.1 To Configure User Switches .............................................................................................................................................230
16.6 CUSTOM ENUMERATIONS....................................................................................................................... 231
16.6.1 To Configure Custom Enumerations ..............................................................................................................................231
17. CHAPTER 17 USER PAGES .................................................................................................... 234
17.1 WHAT ARE USER PAGES........................................................................................................................... 234
17.2 USER PAGE STYLES ................................................................................................................................... 234
17.2.1 Single Loop User Page......................................................................................................................................................234
17.2.2 Dual Loop User Page.........................................................................................................................................................235
17.2.3 Triple Loop User Page – Style 1 .......................................................................................................................................235
17.2.4 Triple Loop User Page – Style 2 .......................................................................................................................................236
17.2.5 Status Grid User Page........................................................................................................................................................236
17.2.6 Bar Graph ............................................................................................................................................................................237
17.2.7 Parameter List Style............................................................................................................................................................237
17.3 To Configure a User page......................................................................................................................... 238
17.3.1 To Display the User Page View ........................................................................................................................................240
17.4 Auto manual operation from a user page ............................................................................................... 240
17.5 USER PAGE PARAMETER TABLES............................................................................................................ 241
17.5.1 Single Loop .........................................................................................................................................................................241
17.5.2 Dual Loop ............................................................................................................................................................................242
17.5.3 Triple Loop 1 and 2............................................................................................................................................................243
17.5.4 Status Grid...........................................................................................................................................................................244
17.5.5 Bar Graph ............................................................................................................................................................................245
17.5.6 Parameter List .....................................................................................................................................................................246
17.5.7 Blank Page...........................................................................................................................................................................246
18. CHAPTER 18 ANALOGUE AND MULTIPLE OPERATORS.................................................. 247
18.1 WHAT ARE ANALOGUE OPERATORS?................................................................................................... 247
18.1.1 Analogue Operations........................................................................................................................................................248
18.2 TO CONFIGURE ANALOGUE OPERATORS............................................................................................ 249
18.2.1 Analogue Operator Parameters ......................................................................................................................................249
18.3 Multiple operators ..................................................................................................................................... 250
18.3.1 Cascading Multiple Input Blocks .....................................................................................................................................250
18.4 To enable multi operators......................................................................................................................... 251
18.5 to locate multi operator parameters ........................................................................................................ 251
18.5.1 MULTI OPERATOR MultiOp1 (to 3) Page.......................................................................................................................251
18.5.2 Use of Default .....................................................................................................................................................................252
19. CHAPTER 19 LOGIC OPERATORS........................................................................................ 253
19.1.1 Logic Operations................................................................................................................................................................253
19.2 TO CONFIGURE LOGIC OPERATORS ..................................................................................................... 254
19.2.1 Logic Operator Parameters..............................................................................................................................................254
19.3 PATCH WIRING .......................................................................................................................................... 255
19.3.1 Patch Wiring Parameters...................................................................................................................................................255
20. CHAPTER 20 DIGITAL COMMUNICATIONS....................................................................... 256
20.1 WHAT IS DIGITAL COMMUNICATIONS? ................................................................................................ 256
20.2 TO CONFIGURE COMMUNICATIONS PARAMETERS ........................................................................... 257
20.2.1 H Module Parameters........................................................................................................................................................257
20.2.2 J Module Parameters.........................................................................................................................................................258
20.3 DIGITAL COMMUNICATIONS DIAGNOSTICS........................................................................................ 259
20.4 Ethernet Technical Note............................................................................................................................ 260
20.4.1 MAC address display.........................................................................................................................................................260
20.4.2 DHCP Settings ....................................................................................................................................................................260
20.4.3 Instrument setup ................................................................................................................................................................260
20.4.4 Network Connection..........................................................................................................................................................260
20.4.5 Dynamic IP Addressing .....................................................................................................................................................260
20.4.6 Fixed IP Addressing...........................................................................................................................................................260
20.4.7 Additional notes .................................................................................................................................................................260

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20.4.8 iTools Setup........................................................................................................................................................................ 261
20.5 Addendum:- 2704 Controller Specials number EU0678.......................................................................262
21. CHAPTER 21 2704 MASTER COMMUNICATIONS..............................................................263
21.1 INTRODUCTION.........................................................................................................................................263
21.1.1 Broadcast Communications............................................................................................................................................. 263
21.1.2 Direct read/write................................................................................................................................................................ 263
21.2 WIRING CONNECTIONS ...........................................................................................................................264
21.2.1 Example Wiring Diagrams for Different Slaves ............................................................................................................ 265
21.3 cross-board version....................................................................................................................................267
21.4 Basic Navigation .........................................................................................................................................267
21.5 To Configure Parameters...........................................................................................................................268
21.6 To Configure Slaves ...................................................................................................................................269
21.7 Parameter Tables........................................................................................................................................270
21.8 additional notes..........................................................................................................................................272
21.8.1 IEEE in 2000 Series............................................................................................................................................................ 272
21.8.2 Configuration mode ......................................................................................................................................................... 272
22. CHAPTER 22 STANDARD IO..................................................................................................273
22.1 WHAT IS STANDARD IO? ..........................................................................................................................273
22.2 PV Input .......................................................................................................................................................273
22.2.1 To Scale the PV Input........................................................................................................................................................ 273
22.2.2 Offset................................................................................................................................................................................... 274
22.2.3 To View and Change Input Filter Time .......................................................................................................................... 275
22.2.4 Standard IO PV Input Parameters................................................................................................................................... 275
22.3 ANALOGUE INPUT.....................................................................................................................................277
22.3.1 To Scale the Analogue Input ........................................................................................................................................... 277
22.3.2 Standard IO Analogue Input Parameters ...................................................................................................................... 277
22.3.3 Sensor Break Value ........................................................................................................................................................... 278
22.4 FIXED RELAY OUTPUT...............................................................................................................................278
22.4.1 TO SCALE THE FIXED RELAY OUTPUT ......................................................................................................................... 278
22.5 THE FIXED RELAY OUTPUT PARAMETERS..............................................................................................280
22.5.1 Standard IO AA Relay Parameters.................................................................................................................................. 280
22.6 STANDARD IO DIG I/OPARAMETERS ......................................................................................................281
22.6.1 Standard Digital IO Parameters ...................................................................................................................................... 281
22.7 STANDARD IO DIAGNOSTIC PARAMETERS ...........................................................................................283
22.7.1 Standard IO Diagnostic Parameters Table.................................................................................................................... 283
23. CHAPTER 23 MODULE IO......................................................................................................284
23.1 WHAT IS MODULE IO? ..............................................................................................................................284
23.2 MODULE IDENTIFICATION.......................................................................................................................285
23.2.1 Idents Page......................................................................................................................................................................... 285
23.3 MODULE IO PARAMETERS .......................................................................................................................286
23.3.1 DC Control and DC Retransmission............................................................................................................................... 286
23.3.2 Relay Output ...................................................................................................................................................................... 287
23.3.3 Triac Output ....................................................................................................................................................................... 288
23.3.4 Triple Logic Output and Single Isolated Logic Output............................................................................................... 289
23.3.5 Triple Logic and Triple Contact Input ............................................................................................................................ 290
23.3.6 Transmitter Power Supply................................................................................................................................................ 290
23.3.7 Transducer Power Supply ................................................................................................................................................ 290
23.3.8 Potentiometer Input.......................................................................................................................................................... 291
23.3.9 PV Input............................................................................................................................................................................... 291
23.3.10 DC Input.............................................................................................................................................................................. 293
23.3.11 Dual PV Input...................................................................................................................................................................... 294
23.3.12 4-Wire RTD Input ............................................................................................................................................................... 296
23.3.13 Dual DC Output................................................................................................................................................................. 297
23.3.14 Dual DC Output Module IO Parameters ....................................................................................................................... 298
23.3.15 High Resolution Retransmission Output........................................................................................................................ 299
23.3.16 High Resolution Output Module Parameters ............................................................................................................... 303
23.4 TDS input Module ......................................................................................................................................304
23.4.1 TDS Input Module Parameters ........................................................................................................................................ 304
23.4.2 Cable Offset ....................................................................................................................................................................... 305
23.5 MODULE SCALING ....................................................................................................................................306
23.5.1 The PV Input ....................................................................................................................................................................... 306
23.5.2 To Scale The PV Input:-..................................................................................................................................................... 307
23.5.3 Output modules ................................................................................................................................................................ 308
23.5.4 To Scale A Control Output:- ............................................................................................................................................ 309
23.5.5 Retransmission Output ..................................................................................................................................................... 310
23.5.6 To Scale the Potentiometer input ................................................................................................................................... 311
23.6 MODULE IO WIRING EXAMPLES..............................................................................................................313
23.6.1 To Configure Module 1 Channel A to Run a Program ................................................................................................ 313
23.6.2 To Operate a Relay from a Digital Input........................................................................................................................ 313
23.6.3 Zirconia Probe Impedance Measurement..................................................................................................................... 314

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24. CHAPTER 24 TRANSDUCER SCALING................................................................................. 316
24.1 WHAT IS TRANSDUCER SCALING?.......................................................................................................... 316
24.2 SHUNT CALIBRATION............................................................................................................................... 316
24.2.1 To Calibrate a Strain Gauge Bridge Transducer ...........................................................................................................317
24.3 LOAD CELL CALIBRATION ....................................................................................................................... 319
24.3.1 To Calibrate a Load Cell....................................................................................................................................................319
24.4 COMPARISON CALIBRATION .................................................................................................................. 320
24.4.1 To Calibrate a Controller Against a Second Reference ...............................................................................................321
24.5 AUTO-TARE CALIBRATION ...................................................................................................................... 322
24.5.1 To Use the Auto-Tare Feature..........................................................................................................................................322
24.6 TRANSDUCER SCALING PARAMETERS .................................................................................................. 324
24.6.1 Transducer Scaling Parameter Table ..............................................................................................................................324
24.6.2 Parameter Notes.................................................................................................................................................................325
25. CHAPTER 25 IO EXPANDER.................................................................................................. 326
25.1 WHAT IS IO EXPANDER? .......................................................................................................................... 326
25.2 TO CONFIGURE IO EXPANDER ............................................................................................................... 327
25.2.1 IO Expander parameters...................................................................................................................................................327
26. CHAPTER 26 DIAGNOSTICS ................................................................................................. 328
26.1 WHAT IS DIAGNOSTICS?.......................................................................................................................... 328
26.1.1 Diagnostics Parameters.....................................................................................................................................................328
27. CHAPTER 27 CALIBRATION.................................................................................................. 330
27.1 USER CALIBRATION .................................................................................................................................. 330
27.2 PRECAUTIONS ........................................................................................................................................... 330
27.3 PV INPUT..................................................................................................................................................... 331
27.3.1 To Calibrate mV Range .....................................................................................................................................................331
27.3.2 Thermocouple Calibration ...............................................................................................................................................333
27.3.3 Voltage Calibration ............................................................................................................................................................333
27.3.4 High Z Voltage Calibration ...............................................................................................................................................333
27.3.5 3-Wire RTD Calibration .....................................................................................................................................................334
27.4 ANALOGUE INPUT .................................................................................................................................... 335
27.5 MODULE I/O .............................................................................................................................................. 336
27.5.1 DC Output Module ............................................................................................................................................................336
27.5.2 PV Input Module.................................................................................................................................................................338
27.5.3 Dual PV Input Module .......................................................................................................................................................338
27.5.4 DC Input Module................................................................................................................................................................338
27.5.5 TDS Input Module – Conductance Calibration..............................................................................................................339
27.5.6 4-Wire RTD Module Calibration.......................................................................................................................................340
27.6 TO RESTORE FACTORY CALIBRATION VALUES.................................................................................... 342
28. CHAPTER 28 BOILER CONTROL .......................................................................................... 343
28.1 introduction ................................................................................................................................................ 343
28.2 what iS TDs?................................................................................................................................................ 343
28.3 how is tds measured? ................................................................................................................................ 344
28.3.1 ‘Specific Conductance’......................................................................................................................................................344
28.3.2 Temperature Correction Factor – TCF25(TLiquid)............................................................................................................344
28.3.3 Probe Factor (K)..................................................................................................................................................................345
28.3.4 Probe Design and TDS Module Operation....................................................................................................................345
28.3.5 Probe Deterioration...........................................................................................................................................................345
28.3.6 Driver O/P............................................................................................................................................................................346
28.3.7 Bubbles................................................................................................................................................................................346
28.4 TDS Function Block.................................................................................................................................... 347
28.4.1 Installation versus Operation Modes ..............................................................................................................................347
28.4.2 Probe Deterioration / Scaling...........................................................................................................................................347
28.4.3 TDS Function Block Parameters.......................................................................................................................................348
28.4.4 Further Parameter Descriptions.......................................................................................................................................350
28.5 bottom blowdown Function Block ........................................................................................................... 355
28.5.1 Bottom Blowdown of Multiple Boilers ............................................................................................................................355
28.5.2 Operating Principles of High Integrity Interlock Bus....................................................................................................356
28.5.3 Blowdown Sequence.........................................................................................................................................................357
28.5.4 Non high integrity Interlock Bus ......................................................................................................................................357
28.5.5 Valve Switch Option...........................................................................................................................................................357
28.5.6 Bottom Blowdown Parameters ........................................................................................................................................358
28.5.7 Example: To Perform a Boiler Blowdown......................................................................................................................359
28.6 TDS Input Module...................................................................................................................................... 359
29. APPENDIX A ORDER CODE .................................................................................................. 360
29.1 hardware code ........................................................................................................................................... 360
29.2 quick start code.......................................................................................................................................... 361
29.3 Quick start code example: ........................................................................................................................ 361

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30. APPENDIX B SAFETY AND EMC INFORMATION ...............................................................362
30.1 Safety ...........................................................................................................................................................362
30.1.1 Electromagnetic compatibility ........................................................................................................................................ 362
30.2 GENERAL.....................................................................................................................................................362
30.3 Service and repair.......................................................................................................................................362
30.3.1 Electrostatic discharge precautions ............................................................................................................................... 362
30.3.2 Cleaning.............................................................................................................................................................................. 362
30.4 Installation Safety Requirements...............................................................................................................363
30.4.1 Safety Symbols................................................................................................................................................................... 363
30.4.2 Personnel............................................................................................................................................................................ 363
30.4.3 Enclosure of live parts....................................................................................................................................................... 363
30.4.4 Isolation............................................................................................................................................................................... 363
30.4.5 Wiring.................................................................................................................................................................................. 363
30.4.6 Power Isolation .................................................................................................................................................................. 364
30.4.7 Earth leakage current........................................................................................................................................................ 364
30.4.8 Overcurrent protection .................................................................................................................................................... 364
30.4.9 Voltage rating .................................................................................................................................................................... 364
30.4.10 Conductive pollution ........................................................................................................................................................ 364
30.4.11 Over-temperature protection.......................................................................................................................................... 364
30.4.12 Grounding of the temperature sensor shield ............................................................................................................... 364
30.5 Installation requirements for EMC ............................................................................................................364
30.5.1 Routing of wires ................................................................................................................................................................. 365
31. APPENDIX C TECHNICAL SPECIFICATION .........................................................................365
31.1 all analogue, dual and pv inputs ...............................................................................................................365
31.2 Precision PV input / Module ......................................................................................................................365
31.3 dual (probe) input module ........................................................................................................................366
31.4 Analogue input...........................................................................................................................................366
31.5 analogue input module .............................................................................................................................366
31.6 Standard digital I/O....................................................................................................................................367
31.7 Digital input modules.................................................................................................................................367
31.8 Digital output modules ..............................................................................................................................367
31.9 Analogue output Modules.........................................................................................................................367
31.10 Transmitter PSU......................................................................................................................................367
31.11 Transducer PSU......................................................................................................................................367
31.12 Dual DC Output .....................................................................................................................................368
31.13 high resolution DC Output....................................................................................................................368
31.14 Potentiometer input...............................................................................................................................368
31.15 TDS module............................................................................................................................................368
31.16 4-Wire RTD Input....................................................................................................................................369
31.17 Digital communications.........................................................................................................................369
31.18 Alarms .....................................................................................................................................................370
31.19 User messages .......................................................................................................................................370
31.20 Control functions....................................................................................................................................370
31.21 Setpoint programmer............................................................................................................................370
31.22 Advanced functions...............................................................................................................................370
31.23 General specification.............................................................................................................................370
31.24 graphical representation of errors .......................................................................................................371
31.24.1 mV Input.............................................................................................................................................................................. 371
31.24.2 Mid range high impedance Input................................................................................................................................... 371
31.24.3 High Level Input................................................................................................................................................................. 372
31.24.4 3-Wire RTD (Pt-100) Input type ...................................................................................................................................... 372
31.24.5 Thermocouple Input type ................................................................................................................................................ 373
32. APPENDIX D PARAMETER UNITS AND ADDRESSES.........................................................374
32.1 COMMONLY USED PARAMETERS ...........................................................................................................374
32.2 PARAMETER UNITS ....................................................................................................................................377
32.3 MODULE STATUS MESSAGES ..................................................................................................................377
ISSUE STATUS OF THIS MANUAL
Issue 6 applise to firmware version 6.51. The manual has been re-formatted in style and size (now A4) to
maintain consistency with other controller manuals. Updates also include Installation and Operation at the
beginning of the document and corrections to cascade controller block diagram sections 11.10.4, and 11.10.5.
Issue 7 updates Directive numbers in section 30.1.

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Related Handbooks
The following related handbooks may be downloaded from the Eurotherm web site www.eurotherm.co.uk/
2704 User Guide (shipped with the controller) Part
No. HA029465.
Describes Installation and general operation
Series 2000 Communication Handbook Part No.
HA026230
Describes EI-BiSynch and Modbus digital
communications
Series 2000 Profibus-DP Communications
Handbook Part No. HA026290
Describes Profibus digital communications
Series 2000 DeviceNet®Handbook Part No
HA027506
Describes DeviceNet®digital communications
Handbook Supplements
2704CP Furnace Atmosphere Controller
Supplement Part No. HA027734
Describes 2704 controller configured for carbon,
dewpoint and oxygen control using Zirconia probes
2704VC Vacuum Furnace Controller Supplement
Part No. HA027655
Describes 2704 controller configured for temperature
and vacuum control of vacuum furnaces
2704MP Melt Pressure Controller Supplement Part
No. HA027519
Describes 2704 controller configured for
measurement and control of melt pressure in
extruders
OEM Security Supplement Part No. HA027482 Describes the orderable option which allows an OEM
to develop and install machine specific strategies
Boiler Controller Part No. HA028177 Specific clone file description

Engineering Handbook 2704 Controller
12 Part No HA026933 Issue 7.0 Nov-12
1. CHAPTER 1 INTRODUCTION
Thank you for selecting the 2704 High Performance Programmer/Controller. This chapter provides a general
overview of your controller to help you to become more familiar with its use, and to ensure that it is the correct
type for your process.
1.1 ABOUT THIS MANUAL
This manual is intended for those who wish to install, commission and configure the controller.
An Installation and Operation sheet is supplied with the controller part number HA029465.
Access to the parameters in the controller is achieved through five configurable levels of security:-
Level 1 Operation only. This level allows, for example, parameters to be changed within safe limits
or programmers to be run, held or reset.
Level 2 Supervisory level. This level allows, for example, parameter limits to be pre-set or programs
to be edited or created.
(Default Passcode = 2)
Level 3 Commissioning level. This level is intended for use when commissioning the instrument. It
allows, for example, calibration offsets to be adjusted to match transducer and transmitter
characteristics.
(Default Passcode = 3)
View
Configuration
It is possible also to read the configuration of the controller at any level but the configuration
cannot be changed.
(Passcode = 2704)
Configuration Configuration of the controller allows you to set up the fundamental characteristics of the
controller so that it can be made to match the requirements of the process. (Default
Passcode = 4)
1.1.1 The Structure Of This Manual
This chapter provides a general overview of the controller.
Chapter 2 describes installation and wiring.
Chapter 3 describes general operation in Operator levels.
Remaining chapters are associated with configuring the controller to specific applications and provide
parameter tables with explanations of their meanings. These chapters follow the order in which the features
appear in the controller and the navigation diagram in section 3.3.

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1.2 WHAT IS 2704
The 2704 is a modular, fully configurable, high accuracy, high
stability temperature and process controller which is available in a
single, dual or three loop format.
It is supplied in accordance with an ordering code which can be
found printed on a label on the side of the instrument case. A
description of the order code is given in Appendix A of this guide
and should be checked with that shown on the label.
A 120 x 160 pixel electroluminescent is used to show all process
information. The user interface is menu driven via the display and
seven front panel keys.
Figure 1-1 shows an example of this display when the instrument
has been configured as a three loop controller.
Figure 1-1: General View of 2704 Controller Display
Features include:
•Advanced ramp/dwell programmer with storage of up to 50 programs.
•Application specific controllers such as Carbon Potential, Humididty and Melt Pressure
•A wide variety of inputs which can be configured, including thermocouples, Pt100 resistance thermometers
and high level process inputs.
•Each loop can be defined to be PID, On/Off or motorised valve position and can control using a variety of
strategies including single, cascade, override and ratio control.
•PID control outputs can be relay, logic, triac or dc with motorised valve position outputs being relay triac or
logic.
•Auto tuning and PID gain scheduling are available to simplify commissioning and optimise the process
Configuration of the controller is explained in this Manual. Configuration is achieved either via the front panel
operator interface or by using ‘iTools’ - a configuration package which runs under the Windows 95, or NT
operating systems
Figure 1-2: General View of 2704 Controller
KEY
Display screen
Latching ears
Panel sealing gasket
Panel retaining clips
Label
Sleeve
Terminal covers
Ratchets












Engineering Handbook 2704 Controller
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2. CHAPTER 2 INSTALLATION
The 2704 controller must be mounted and wired in accordance with the instructions given in this chapter and in
the Installation sheet, Part No. HA029465 which is supplied with the controller.
The controller is intended to be mounted through a cut out in the front panel of an electrical control cabinet.
Select a location where the minimum vibrations are present and the ambient temperature is within 0 and 50OC
(32 and 122OF). The controller is retained in position using the panel mounting clips supplied.
All wires are connected to terminals at the rear of the instrument. Each block of six terminals is protected by a
hinged cover which clicks into closed position.
Before proceeding please read Appendix B ‘Safety and EMC Information’.
2.1 MECHANICAL INSTALLATION
2.1.1 Positioning
The controller can be mounted vertically or on a sloping panel of maximum thickness 15mm (0.6in). Adequate
access space must be available at the rear of the instrument panel for wiring and servicing purposes. The
outline dimensions are shown in below.
Take care not to cover ventilation holes in the top, bottom and sides of the instrument.
2.1.2 Outline dimensions Model 2704
Figure 2-1: Outline Dimensions
Front Panel
Height 96mm
(3.78in)
Overall depth behind
panel 150mm
(5.91in)
Front panel width
96mm
(3.78in)
Panel thickness u
p
to 15mm,
0.6in.

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2.1.3 Mounting the Controller
1. Prepare the panel cut-out to the size shown in Figure 2-2. Ensure that there is sufficient spacing between
instruments as shown by the minimum dimensions given in Figure 2-2. Ensure also that the controller is not
mounted close to any device which is likely to produce a significant amount of heat which may affect the
performance of the controller.
2. Insert the controller through the panel cut-out.
3. Spring the upper and lower panel retaining clips into place. Secure the controller in position by holding it
level and pushing both retaining clips forward.
4. Peel off the protective cover from the display.
Note:- If the retaining clips subsequently need removing, in order to extract the controller from the control
panel, they can be unhooked from the side with either your fingers or a screwdriver.
Figure 2-2: Panel Cut-out and Minimum Spacing Requirements
2.1.4 Unplugging and Plugging in the Controller
If required, the controller can be unplugged from its sleeve by easing the latching ears outwards and pulling the
controller forward out of the sleeve. When plugging the controller back into its sleeve, ensure that the latching
ears click into place.
It is recommended that the power to the controller is switched off when un-plugging or plugging the controller
into its sleeve. This is to prevent premature wear on the controller connectors when current is flowing through
them.
Panel cut-out
92 x 92 mm
3.62 x 3.62 in
-0
+0.8
-0
+0.03
Recommended
minimum
spacing of
controllers
38mm
(1.5in)
10mm
(0.4in)
(Not to
scale)

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2.2 I/O MODULES
The 2704 controller has the facility to fit optional plug in modules. The connections for these modules are made
to the inner three connector blocks as shown below.
The modules are:
•Communications modules.
•I/O modules
A list of available modules is given in Table 23-1.
These modules are fitted simply by sliding them into the relevant position as shown below.
Figure 2-3: View of the Plug-in Modules
2.2.1 To Add or Change Modules
Should it be necessary to add, remove or change the position of modules the following procedure is
recommended.
Remove the controller form its sleeve.
It is recommended that the controller is switched off before it is removed from its sleeve.
1. To remove the controller from its sleeve, push both latching ears (Figure 2-1) outwards and ease the
controller forwards from its sleeve. It should not be necessary to use any tools for this.
2. To remove a module it may be gripped by the rear terminals and pulled out from its location.
3. To fit a new module gently insert it into the required location ensuring that the raised section on the plastic
cover of the module slides into the slot in the retaining housing.
4. Slide the controller back into its sleeve and turn power back on.
5. After a brief initialisation period, the message !:Module Changed will appear on the display.
6. Press and together, as instructed, to acknowledge.
7. If the message Bad Ident is displayed this indicates that the wrong type of module has been installed, for
example an unisolated logic output module from 2400 series.
|

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2.3 WIRING
WARNING
You must ensure that the controller is correctly configured for your application. Incorrect
configuration could result in damage to the process being controlled, and/or personal injury. It is
your responsibility, as the installer, to ensure that the configuration is correct. The controller may
either have been configured when ordered, or may need configuring now.
Before proceeding further, please read Appendix B, Safety and EMC information.
2.3.1 Electrical Connections
All electrical connections are made to the screw terminals at the rear of the controller. They accept wire sizes
from 0.5 to 1.5 mm2(16 to 22 AWG) and should be tightened to a torque of 0.4Nm (3.5lbin). If you wish to use
crimp connectors, the correct size is AMP part number 349262-1. The terminals are protected by a clear plastic
hinged cover to prevent hands, or metal, making accidental contact with live wires.
2.3.2 Rear Terminal Layout
The rear terminal layout is shown in Figure 2-4, which identifies terminal designations and their functions. Refer
to the individual diagrams to wire the controller to your requirements.
The two outer terminal strips have fixed hardware for all versions of the instrument, as follows:-
•A Process Variable input which can be configured for:-
•Thermocouple, RTD, Pyrometer, Voltage (e.g. 0-10Vdc) or Milliamp (e.g. 4-20mA) plus vacuum –
log10
•Seven Digital I/O, configurable as input or output
•Inputs are logic (-1 to 35Vdc) or contact closure, and can be configured for:- Manual, Remote, Run,
Hold, Reset, etc,
•Outputs are open collector requiring an external power supply, and can be configured as event,
status time proportioning or valve position outputs.
•One digital input
•An I/O expander which allows additional digital I/O via an external unit, or an extra digital input
•A changeover relay which can be configured as an alarm or event output. It cannot be configured as a time
proportioning output
•An analogue input for volts (e.g. 0-10Vdc) or Milliamp (e.g. 4-20mA) signals to a second PID loop, setpoint,
etc,. (This input can be characterised to match a particular curve from a transmitter. It cannot accept
thermocouple inputs directly)
•Power supply to the unit. The supply may be 85 - 264Vac 50 or 60 Hz,
The three central terminal strips are for optional plug in modules, as follows:-
•Terminals marked 2A to 2D are reserved for a Memory Module only. No connections should be made to
these terminals
•Terminals marked HA to HF are connections for optional EIA232, EIA485, or EIA422 communications
modules
•Terminals marked JA to JF are connections for an optional slave communications module or second
communications port used to communicate with other instruments
The modules fitted into the above two communications slots can be inter-changed
For a full list of available modules refer to the Ordering code - Appendix A and the Technical Specification -
Appendix C.
Warning:- Take care that mains supplies are connected only to the power supply terminals (100
to 240Vac only), the fixed relay terminals or to relay or triac modules. Under no circumstances
should mains supplies be connected to any other terminals.
!

Engineering Handbook 2704 Controller
18 Part No HA026933 Issue 7.0 Nov-12
2.4 REAR TERMINALS
Figure 2-4: Rear Terminal Connections
Hinged
cover in
open
position
N
L
BB
B
A
BC
2D
2B
2
A
2C
1D
1B
1A
1C
M
O
D
U
L
E
1
M
O
D
U
L
E
3
HF
HD
HE
JF
JD
JE
D8
E2
E1
AC
AA
AB
HB
HA
HC
JB
JA
JC
D5
D4
D3
D1
DC
D2
D7
D6
V-
VI
VH
V+
M
O
D
U
L
E
4
M
O
D
U
L
E
5
M
O
D
U
L
E
6
Power Supply
Digital Input
Relay
Analogue input
0-10V
6D
6C
6B
6A
5D
5C
5B
5A
4D
4C
4B
4
A
PV input
I/O Expander
or Digital input
Digital I/O
3B
3A
3C
3D
C
O
M
M
S
M
O
D
U
L
E
H
C
O
M
M
S
M
O
D
U
L
E
J
Analogue input
screen
The functionality of the two outer rows of terminals is
common to all instrument variants, as follows:-
PV input VH, VI, V+, V-
Analogue input BA, BB
I/O expander E1, E2
Fixed changeover
relay
AA, AB, AC
Digital I/O channels D1 to D8 and DC
Power supply L, N, Earth
* Terminals 2A, 2B, 2C, 2D must not be wired to.
*
*
*
*