Eurotherm Invensys Mini8 User manual

Mini8TM
User
Manual
Mini8 Multi-loop Process Controller
Version 2.68.
HA028581/15
November 2015

Eurotherm

MINI8 CONTROLLER: ENGINEERING HANDBOOK
HA028581 Page 1
Issue 15 Nov 15 CN33941
Mini8 controller – Multi-Loop Process Controller
WARNING BACK UP BATTERY................................................................................................................................................8
1. CHAPTER 1 INSTALLATION..............................................................................................................................10
1.1 What Instrument Do I Have? ......................................................................................................................10
1.2 Mini8 Controller Ordering Code ...............................................................................................................11
1.3 How to Install the Controller ......................................................................................................................12
1.3.1 Dimensions................................................................................................................................................................. 12
1.3.2 To Install the Controller ............................................................................................................................................ 12
1.3.3 Environmental Requirements .................................................................................................................................. 12
1.4 Electrical Connections – Common to All Instruments ............................................................................13
1.4.1 Power Supply ............................................................................................................................................................. 13
1.4.2 Fixed IO Connections ............................................................................................................................................... 14
1.4.3 Digital Communications Connections.................................................................................................................... 14
1.4.4 Configuration Port (CC)........................................................................................................................................... 14
1.4.5 Screened Communications Cables......................................................................................................................... 14
1.5 Electrical Connections for Modbus ...........................................................................................................15
1.5.1 Modbus Connectors ................................................................................................................................................. 15
1.5.2 RS485.......................................................................................................................................................................... 15
1.5.3 Direct Connection - Master and One Slave ........................................................................................................... 16
1.5.4 RS485 to RS232 Converter....................................................................................................................................... 17
1.5.5 One Master, Multiple slaves Short Network........................................................................................................... 18
1.5.6 Wiring Connections for Modbus Broadcast Communications............................................................................ 19
1.6 Electrical Connections for DeviceNet / CANopen..................................................................................20
1.6.1 DeviceNet Connector ............................................................................................................................................... 20
1.6.2 Network Length ......................................................................................................................................................... 21
1.6.3 Typical DeviceNet / CANopen Wiring Diagram.................................................................................................... 21
1.7 Electrical Connections for Enhanced DeviceNet Interface....................................................................22
1.7.1 Enhanced DeviceNet Connector............................................................................................................................. 22
1.7.2 Switches and LED Indicators.................................................................................................................................... 22
1.8 Electrical Connections for Profibus DP.....................................................................................................23
1.8.1 Profibus Interface (D-Type Connector)................................................................................................................... 23
1.8.2 Profibus Interface (RJ45 Connector)....................................................................................................................... 23
1.9 Electrical Connections for EtherNet (Modbus TCP) ...............................................................................24
1.9.1 Connector: RJ45:....................................................................................................................................................... 24
1.10 Electrical Connections for EtherNet/IP.....................................................................................................25
1.10.1 Connector: RJ45:.................................................................................................................................................. 25
1.11 Electrical Connections for EtherCAT.........................................................................................................26
1.11.1 Connector: RJ45:.................................................................................................................................................. 26
1.12 Electrical Connections for Thermocouple Input TC4 and TC8 .............................................................27
1.13 Electrical Connections for RTD ..................................................................................................................27
1.14 Electrical Connections for Logic Input DI8...............................................................................................28
1.15 Electrical Connections for Logic Output DO8.........................................................................................28
1.16 Electrical Connections for Inductive Loads..............................................................................................28
1.17 Electrical Connections for Relay Output RL8...........................................................................................29
1.18 Electrical Connections for Analogue Output AO4 and AO8 ................................................................29
1.19 Electrical Connections for Current Transformer Input Module CT3 ....................................................30
1.20 Adding or Replacing an IO Module. .........................................................................................................31
2. CHAPTER 2 MINI8 CONTROLLER LED INDICATORS ...................................................................................32
2.1 Status Indication for Enhanced DeviceNet ..............................................................................................33
2.1.1 Module Status Indication.......................................................................................................................................... 33
2.1.2 Network Status Indication ........................................................................................................................................ 33
2.2 Status Indication for EtherNet/IP...............................................................................................................34
2.2.1 Module Status Indication.......................................................................................................................................... 34
2.2.2 Network Status Indication ........................................................................................................................................ 34
2.3 Status LEDs for EtherCAT............................................................................................................................35
2.3.1 ‘OP’ – Mini8 Run Status Indication ........................................................................................................................... 35
2.3.2 ‘CC’ - Configuration Port Status Indication ............................................................................................................ 35
2.3.3 ‘RUN’ – EtherCAT Slave Run Status Indication ...................................................................................................... 35
2.3.4 ‘ERR’ – Error Status Indication ................................................................................................................................. 35

MINI8 CONTROLLER: ENGINEERING HANDBOOK
Page 2 HA028581
Issue 15 Nov 15
3. CHAPTER 3 USING THE MINI8 CONTROLLER ...............................................................................................36
3.1 iTools..............................................................................................................................................................36
3.1.1 iTools OPC Open server........................................................................................................................................... 36
3.2 Modbus, single register, SCADA addressing ..........................................................................................36
3.3 Modbus (Floating Point) .............................................................................................................................37
3.4 Fieldbus .........................................................................................................................................................37
3.5 EtherNet (Modbus TCP)..............................................................................................................................37
3.6 Mini8 Controller Execution.........................................................................................................................37
3.7 The iTools Operator Interface....................................................................................................................38
3.7.1 Scanning..................................................................................................................................................................... 38
3.7.2 Browsing and Changing Parameter Values ........................................................................................................... 38
3.8 Recipe Editor ................................................................................................................................................40
3.8.1 Recipe Menu Commands......................................................................................................................................... 40
3.9 OPCScope .....................................................................................................................................................41
3.9.1 OPC Scope List Window Context Menu................................................................................................................. 42
3.9.2 OPC Scope Chart Window....................................................................................................................................... 42
3.9.3 OPC Server................................................................................................................................................................. 44
4. CHAPTER 4 CONFIGURATION USING ITOOLS .............................................................................................45
4.1 Configuration................................................................................................................................................45
4.1.1 On-Line/Off-line Configuration ............................................................................................................................... 45
4.2 Connecting a PC to the Mini8 Controller .................................................................................................45
4.2.1 Configuration Cable and Clip.................................................................................................................................. 45
4.2.2 Scanning..................................................................................................................................................................... 45
4.3 Cloning...........................................................................................................................................................46
4.4 Configuring the Mini8 Controller ..............................................................................................................47
4.4.1 Function Blocks.......................................................................................................................................................... 47
4.4.2 Soft Wiring.................................................................................................................................................................. 48
4.5 Simple Worked Example ............................................................................................................................49
4.5.1 The I/O........................................................................................................................................................................ 49
4.5.2 Wiring ......................................................................................................................................................................... 52
4.6 Graphical Wiring Editor ..............................................................................................................................55
4.6.1 Graphical Wiring Toolbar......................................................................................................................................... 56
4.6.2 Function Block ........................................................................................................................................................... 56
4.6.3 Wire............................................................................................................................................................................. 56
4.6.4 Block Execution Order.............................................................................................................................................. 56
4.6.5 Using Function Blocks............................................................................................................................................... 56
4.6.6 Tooltips....................................................................................................................................................................... 57
4.6.7 Function Block State ................................................................................................................................................. 58
4.6.8 Using Wires ................................................................................................................................................................ 59
4.6.9 Using Comments....................................................................................................................................................... 60
4.6.10 Using Monitors...................................................................................................................................................... 61
4.6.11 Downloading......................................................................................................................................................... 61
4.6.12 Selections............................................................................................................................................................... 61
4.6.13 Colours................................................................................................................................................................... 62
4.6.14 Diagram Context Menu ....................................................................................................................................... 62
4.6.15 Wiring Floats with Status Information ................................................................................................................ 63
4.6.16 Edge Wires ............................................................................................................................................................ 64
5. CHAPTER 5 MINI8 CONTROLLER OVERVIEW ..............................................................................................65
5.1 Complete list of Function Blocks. ..............................................................................................................66
6. CHAPTER 6 ACCESS FOLDER ..........................................................................................................................67
7. CHAPTER 7 INSTRUMENT FOLDER ................................................................................................................68
7.1 Instrument / Enables....................................................................................................................................68
7.2 Instrument Options......................................................................................................................................69
7.3 Instrument / InstInfo.....................................................................................................................................69
7.4 Instrument / Diagnostics .............................................................................................................................70
8. CHAPTER 8 I/O FOLDER ...................................................................................................................................72
8.1 Module ID......................................................................................................................................................72
8.1.1 Modules...................................................................................................................................................................... 72
8.2 Logic Input.....................................................................................................................................................73
8.2.1 Logic Input Parameters............................................................................................................................................. 73
8.3 Logic Output .................................................................................................................................................74

MINI8 CONTROLLER: ENGINEERING HANDBOOK
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8.3.1 Logic Out Parameters ............................................................................................................................................... 74
8.3.2 Logic Output Scaling ................................................................................................................................................ 75
8.3.3 Example: To Scale a Proportioning Logic Output ............................................................................................... 75
8.4 Relay Output.................................................................................................................................................76
8.4.1 Relay Parameters....................................................................................................................................................... 76
8.5 Thermocouple Input ....................................................................................................................................77
8.5.1 Thermocouple Input Parameters ............................................................................................................................ 77
8.5.2 Linearisation Types and Ranges.............................................................................................................................. 79
8.5.3 CJC Type .................................................................................................................................................................... 79
8.5.4 Sensor Break Value ................................................................................................................................................... 80
8.5.5 Fallback....................................................................................................................................................................... 80
8.5.6 User Calibration (Two Point) .................................................................................................................................... 81
8.5.7 PV Offset (Single Point)............................................................................................................................................. 81
8.5.8 Using TC4 or TC8 channel as a mV input............................................................................................................... 82
8.6 Resistance Thermometer Input..................................................................................................................83
8.6.1 RT Input Parameters.................................................................................................................................................. 83
8.6.2 Linearisation Types and Ranges.............................................................................................................................. 84
8.6.3 Using RT4 as mA input.............................................................................................................................................. 84
8.7 Analogue Output .........................................................................................................................................85
8.7.1 Example: 4 to 20mA Analogue Output................................................................................................................. 85
8.8 Fixed IO .........................................................................................................................................................86
8.9 Current Monitor............................................................................................................................................87
8.9.1 Current Measurement............................................................................................................................................... 87
8.9.2 Single Phase Configurations.................................................................................................................................... 88
8.9.3 Three Phase Configuration ...................................................................................................................................... 90
8.9.4 Parameter Configuration.......................................................................................................................................... 91
8.9.5 Commissioning.......................................................................................................................................................... 92
8.9.6 Calibration.................................................................................................................................................................. 94
9. CHAPTER 9 ALARMS..........................................................................................................................................95
9.1 Further Alarm Definitions ...........................................................................................................................95
9.2 Analogue Alarms..........................................................................................................................................96
9.2.1 Analogue Alarm Types ............................................................................................................................................. 96
9.3 Digital Alarms ...............................................................................................................................................97
9.3.1 Digital Alarm Types................................................................................................................................................... 97
9.4 Alarm Outputs ..............................................................................................................................................97
9.4.1 How Alarms are Indicated........................................................................................................................................ 97
9.4.2 To Acknowledge an Alarm....................................................................................................................................... 97
9.5 Alarm Parameters.........................................................................................................................................98
9.5.1 Example: To Configure Alarm 1 ............................................................................................................................. 99
9.6 Digital Alarm Parameters......................................................................................................................... 100
9.6.1 Example: To Configure DigAlarm 1..................................................................................................................... 100
9.7 Alarm Summary ......................................................................................................................................... 101
9.8 Alarm Log ................................................................................................................................................... 103
10. CHAPTER 10 BCD INPUT ................................................................................................................................ 104
10.1 BCD Parameters ........................................................................................................................................ 104
10.1.1 Example: To wire a BCD Input ......................................................................................................................... 105
11. CHAPTER 11 DIGITAL COMMUNICATIONS................................................................................................ 106
11.1 Configuration Port (CC) ........................................................................................................................... 106
11.1.1 Configuration Communications Parameters................................................................................................... 106
11.2 Field Communications Port (FC)............................................................................................................. 107
11.2.1 Communications Identity................................................................................................................................... 107
11.3 Modbus....................................................................................................................................................... 108
11.3.1 Modbus Connections......................................................................................................................................... 108
11.3.2 Modbus Address Switch.................................................................................................................................... 108
11.3.3 Baud Rate............................................................................................................................................................. 108
11.3.4 Parity..................................................................................................................................................................... 108
11.3.5 RX/TX Delay Time............................................................................................................................................... 108
11.4 Modbus Broadcast Master Communications ....................................................................................... 109
11.4.1 Mini8 Controller Broadcast Master .................................................................................................................. 109
11.4.2 Modbus Parameters ........................................................................................................................................... 110
11.5 DeviceNet................................................................................................................................................... 111
11.6 Enhanced DeviceNet Interface ............................................................................................................... 111
11.6.1 Address Switch.................................................................................................................................................... 111

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11.6.2 Baud Switch......................................................................................................................................................... 111
11.7 Switch Position in iTools .......................................................................................................................... 111
11.7.1 DeviceNet Parameters ....................................................................................................................................... 112
11.8 CANopen.................................................................................................................................................... 113
11.8.1 Instrument setup................................................................................................................................................. 113
11.8.2 Mini8 Controller CANopen Features ............................................................................................................... 113
11.8.3 Communication Interface .................................................................................................................................. 114
11.8.4 Network Management (NMT) ........................................................................................................................... 115
11.8.5 Device Profile DS-404 ........................................................................................................................................ 116
11.8.6 Default PDOs....................................................................................................................................................... 116
11.8.7 Enabling and Disabling PDO Communications ............................................................................................. 119
11.8.8 Changing PDO Mapping................................................................................................................................... 119
11.8.9 Remapping over the network ........................................................................................................................... 122
11.8.10 Enabling & Disabling PDO Change of State transmission. ........................................................................... 124
11.8.11 General Communication Objects..................................................................................................................... 124
11.9 Profibus....................................................................................................................................................... 129
11.9.1 Profibus Parameters ........................................................................................................................................... 129
11.10 EtherNet (Modbus TCP)...................................................................................................................... 130
11.10.1 Instrument setup................................................................................................................................................. 130
11.10.2 Unit Identity ......................................................................................................................................................... 130
11.10.3 Dynamic Host Configuration Protocol (DHCP) Settings ................................................................................ 130
11.10.4 iTools Setup......................................................................................................................................................... 131
11.10.5 EtherNet Parameters .......................................................................................................................................... 132
11.11 EtherNet/IP ............................................................................................................................................ 133
11.11.1 Feature Switch..................................................................................................................................................... 133
11.11.2 Configuration using iTools ................................................................................................................................ 133
11.11.3 EtherNet/IP Parameters ..................................................................................................................................... 134
11.11.4 Input Definition Table ........................................................................................................................................ 135
11.11.5 Output Definition Table..................................................................................................................................... 136
11.11.6 Requested Packet Interval ................................................................................................................................. 136
11.12 Example - Connect Mini8 Controller to Allen-Bradley PLC via EtherNet/IP............................... 137
11.12.1 Installation............................................................................................................................................................ 137
11.12.2 Setting Up The Link Between Windows And The Plc Network..................................................................... 137
11.12.3 Updating Firmware............................................................................................................................................. 139
11.12.4 Completing the Link........................................................................................................................................... 139
11.12.5 Creating a Network Scanner ............................................................................................................................. 141
11.12.6 Create or Load a Mini8 Controller Configuration .......................................................................................... 144
11.12.7 Run Mode ............................................................................................................................................................ 145
11.12.8 Monitor Parameters............................................................................................................................................ 146
11.12.9 Status Indicators.................................................................................................................................................. 146
11.12.10 Mini8 Controller on an Ethernet/Ip Network.............................................................................................. 147
11.12.11 TROUBLESHOOTING .................................................................................................................................... 148
11.13 EtherCAT ................................................................................................................................................ 149
11.13.1 EtherCAT-to-Modbus Interface......................................................................................................................... 149
11.13.2 EtherCAT Feature Switch................................................................................................................................... 149
11.13.3 EtherCAT Parameters......................................................................................................................................... 150
11.13.4 Parameter pick list and IO Mapping ................................................................................................................ 151
11.14 File over EtherCAT................................................................................................................................ 152
11.14.1 To produce a UID File ........................................................................................................................................ 153
11.14.2 Precautions.......................................................................................................................................................... 153
11.15 Trademark.............................................................................................................................................. 154
12. CHAPTER 12 COUNTERS, TIMERS, TOTALISERS, RT CLOCK ................................................................ 155
12.1 Counters ..................................................................................................................................................... 155
12.1.1 Counter Parameters ........................................................................................................................................... 156
12.2 Timers.......................................................................................................................................................... 157
12.2.1 Timer Types......................................................................................................................................................... 157
12.2.2 On Pulse Timer Mode ........................................................................................................................................ 157
12.2.3 On Delay Timer Mode........................................................................................................................................ 158
12.2.4 One Shot Timer Mode ....................................................................................................................................... 159
12.2.5 Minimum On Timer or Compressor Mode...................................................................................................... 160
12.2.6 Timer Parameters................................................................................................................................................ 161
12.3 Totalisers..................................................................................................................................................... 162
12.3.1 Totaliser Parameters........................................................................................................................................... 163
12.4 Real Time Clock......................................................................................................................................... 164
12.4.1 Real Time Clock Parameters.............................................................................................................................. 164

MINI8 CONTROLLER: ENGINEERING HANDBOOK
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13. CHAPTER 13 APPLICATIONS ........................................................................................................................ 165
13.1 Humidity ..................................................................................................................................................... 165
13.1.1 Overview.............................................................................................................................................................. 165
13.1.2 Temperature Control of an Environmental Chamber.................................................................................... 165
13.1.3 Humidity Control of an Environmental Chamber........................................................................................... 165
13.1.4 Humidity Parameters.......................................................................................................................................... 166
13.2 Zirconia (Carbon Potential) Control....................................................................................................... 167
13.2.1 Temperature Control ......................................................................................................................................... 167
13.2.2 Carbon Potential Control................................................................................................................................... 167
13.2.3 Sooting Alarm ..................................................................................................................................................... 167
13.2.4 Automatic Probe Cleaning ................................................................................................................................ 167
13.2.5 Endothermic Gas Correction ............................................................................................................................ 167
13.2.6 Clean Probe......................................................................................................................................................... 167
13.2.7 Probe Status ........................................................................................................................................................ 167
13.2.8 Zirconia Parameters............................................................................................................................................ 168
14. CHAPTER 14 INPUT MONITOR..................................................................................................................... 170
14.1 Description................................................................................................................................................. 170
14.1.1 Maximum Detect................................................................................................................................................. 170
14.1.2 Minimum Detect ................................................................................................................................................. 170
14.1.3 Time Above Threshold....................................................................................................................................... 170
14.2 Input Monitor Parameters........................................................................................................................ 171
15. CHAPTER 15 LOGIC AND MATHS OPERATORS. ...................................................................................... 172
15.1 Logic Operators......................................................................................................................................... 172
15.1.1 Logic 8.................................................................................................................................................................. 172
15.1.2 2 input Logic Operations................................................................................................................................... 173
15.1.3 Logic Operator Parameters............................................................................................................................... 174
15.2 Eight Input Logic Operators.................................................................................................................... 175
15.3 Maths Operators ....................................................................................................................................... 176
15.3.1 Math Operations................................................................................................................................................. 177
15.3.2 Math Operator Parameters................................................................................................................................ 178
15.3.3 Sample and Hold Operation............................................................................................................................. 179
15.4 Multiple Input Operator Block................................................................................................................ 180
15.4.1 Cascaded operation........................................................................................................................................... 181
15.4.2 Fallback Strategy ................................................................................................................................................ 181
15.4.3 Multiple Input Operator Block Parameters ..................................................................................................... 182
15.5 Eight Input Analog Multiplexers............................................................................................................. 183
15.5.1 Multiple Input Operator Parameters................................................................................................................ 183
15.5.2 Fallback................................................................................................................................................................ 183
16. CHAPTER 16 INPUT CHARACTERISATION................................................................................................. 184
16.1 Input Linearisation .................................................................................................................................... 184
16.1.1 Compensation for Sensor Non-Linearities ...................................................................................................... 185
16.1.2 Input Linearisation Parameters ......................................................................................................................... 186
16.2 Polynomial.................................................................................................................................................. 187
17. CHAPTER 17 LOAD......................................................................................................................................... 189
17.1 Load Parameters ....................................................................................................................................... 189
18. CHAPTER 18 CONTROL LOOP SET UP ....................................................................................................... 190
18.1 What is a Control Loop?........................................................................................................................... 190
18.2 Loop Parameters – Main........................................................................................................................... 191
18.3 Loop Set up ................................................................................................................................................ 192
18.3.1 Types of Control Loop ....................................................................................................................................... 192
18.4 PID Control................................................................................................................................................. 193
18.4.1 Proportional Band .............................................................................................................................................. 194
18.4.2 Integral Term....................................................................................................................................................... 194
18.4.3 Derivative Term................................................................................................................................................... 195
18.4.4 High and Low Cutback....................................................................................................................................... 196
18.4.5 Integral action and manual reset ...................................................................................................................... 196
18.4.6 Relative Cool Gain .............................................................................................................................................. 196
18.4.7 Loop Break .......................................................................................................................................................... 197
18.4.8 Cooling Algorithm.............................................................................................................................................. 197
18.4.9 Gain Scheduling ................................................................................................................................................. 198
18.4.10 PID Parameters.................................................................................................................................................... 199

MINI8 CONTROLLER: ENGINEERING HANDBOOK
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18.5.1 Loop Response ................................................................................................................................................... 200
18.5.2 Initial Settings...................................................................................................................................................... 200
18.5.3 Multi-zone applications...................................................................................................................................... 201
18.5.4 Automatic Tuning ............................................................................................................................................... 202
18.5.5 Tune Parameters................................................................................................................................................. 203
18.5.6 To Auto Tune a Loop - Initial Settings.............................................................................................................. 203
18.5.7 To Start Autotune................................................................................................................................................ 204
18.5.8 Autotune and Sensor Break .............................................................................................................................. 204
18.5.9 Autotune and Inhibit .......................................................................................................................................... 204
18.5.10 Autotune and Gain Scheduling ........................................................................................................................ 204
18.5.11 Autotune from Below SP – Heat/Cool .............................................................................................................. 205
18.5.12 Autotune From Below SP – Heat Only.............................................................................................................. 206
18.5.13 Autotune at Setpoint – Heat/Cool..................................................................................................................... 207
18.5.14 Failure Modes ..................................................................................................................................................... 208
18.5.15 Manual Tuning .................................................................................................................................................... 209
18.5.16 Manually Setting Relative Cool Gain................................................................................................................ 209
18.5.17 Manually Setting the Cutback Values............................................................................................................... 210
18.6 Setpoint Function Block ........................................................................................................................... 211
18.6.1 Setpoint Function Block..................................................................................................................................... 211
18.6.2 SP Tracking .......................................................................................................................................................... 212
18.6.3 Manual Tracking ................................................................................................................................................. 212
18.6.4 Rate Limit ............................................................................................................................................................. 212
18.6.5 Setpoint Parameters........................................................................................................................................... 212
18.6.6 Setpoint Limits..................................................................................................................................................... 214
18.6.7 Setpoint Rate Limit.............................................................................................................................................. 214
18.6.8 Setpoint Tracking................................................................................................................................................ 215
18.6.9 Manual Tracking ................................................................................................................................................. 215
18.7 Output Function Block ............................................................................................................................. 216
18.7.1 Output Limits....................................................................................................................................................... 219
18.7.2 Output Rate Limit................................................................................................................................................ 220
18.7.3 Sensor Break Mode ............................................................................................................................................ 220
18.7.4 Forced Output .................................................................................................................................................... 220
18.7.5 Feedforward........................................................................................................................................................ 221
18.7.6 Effect of Control Action, Hysteresis and Deadband ...................................................................................... 222
19. CHAPTER 19 SETPOINT PROGRAMMER ................................................................................................... 223
19.1 INTRODUCTION........................................................................................................................................ 223
19.1.1 Time to Target Programmer.............................................................................................................................. 223
19.1.2 Ramp Rate Programmer .................................................................................................................................... 224
19.2 Mini8 Controller Programmer Block(s).................................................................................................. 224
19.3 Segment Types.......................................................................................................................................... 225
19.3.1 Rate....................................................................................................................................................................... 225
19.3.2 Dwell..................................................................................................................................................................... 225
19.3.3 Step ...................................................................................................................................................................... 225
19.3.4 Time...................................................................................................................................................................... 225
19.3.5 GoBack................................................................................................................................................................. 225
19.3.6 Wait....................................................................................................................................................................... 226
19.3.7 End........................................................................................................................................................................ 226
19.4 Output Events............................................................................................................................................ 227
19.4.1 Digital Events....................................................................................................................................................... 227
19.4.2 PV Event & User Value........................................................................................................................................ 228
19.4.3 Time Event........................................................................................................................................................... 229
19.5 Holdback .................................................................................................................................................... 231
19.5.1 Guaranteed Soak................................................................................................................................................ 231
19.6 PID Select ................................................................................................................................................... 232
19.7 Program Cycles.......................................................................................................................................... 232
19.7.1 Servo..................................................................................................................................................................... 232
19.8 Power Fail Recovery ................................................................................................................................. 233
19.8.1 Ramp (Power fail during Dwell segments.) ..................................................................................................... 233
19.8.2 Ramp (power fail during Ramp segments)...................................................................................................... 233
19.8.3 Ramp (power fail during Time-to-target segments)....................................................................................... 233
19.9 To Run, Hold or Reset a Program ........................................................................................................... 234
19.9.1 Run........................................................................................................................................................................ 234
19.9.2 Reset..................................................................................................................................................................... 234
19.9.3 Hold...................................................................................................................................................................... 234
19.9.4 Skip segment....................................................................................................................................................... 234
19.9.5 Advance segment............................................................................................................................................... 235

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19.9.6 Fast ....................................................................................................................................................................... 235
19.10 PV Start ................................................................................................................................................... 235
19.11 Configuring the Programmer ............................................................................................................. 236
19.12 Programmer Run Status....................................................................................................................... 239
19.13 Creating a Program .............................................................................................................................. 240
19.14 Program Editor...................................................................................................................................... 240
19.14.1 Analog View ........................................................................................................................................................ 241
19.14.2 Digital View.......................................................................................................................................................... 243
19.14.3 Saving & Loading Programs.............................................................................................................................. 243
19.14.4 Printing a Program.............................................................................................................................................. 244
19.15 Wiring the Programmer Function Block. .......................................................................................... 245
20. CHAPTER 20 SWITCH OVER .......................................................................................................................... 247
20.1 Switch Over Parameters........................................................................................................................... 248
21. CHAPTER 21 TRANSDUCER SCALING ........................................................................................................ 249
21.1 Auto-Tare Calibration............................................................................................................................... 249
21.2 Load Cell..................................................................................................................................................... 250
21.3 Comparison Calibration........................................................................................................................... 250
21.4 Transducer Scaling Parameters .............................................................................................................. 250
21.4.1 Parameter Notes................................................................................................................................................. 252
21.4.2 Tare Calibration .................................................................................................................................................. 252
21.4.3 Load Cell.............................................................................................................................................................. 253
21.4.4 Comparison Calibration .................................................................................................................................... 253
22. CHAPTER 22 USER VALUES........................................................................................................................... 254
22.1 User Value Parameters ............................................................................................................................. 254
23. CHAPTER 23 CALIBRATION .......................................................................................................................... 255
23.1 TC4 / TC8 User calibration....................................................................................................................... 255
23.1.1 Set Up................................................................................................................................................................... 255
23.1.2 Zero Calibration.................................................................................................................................................. 255
23.1.3 Voltage Calibration ............................................................................................................................................ 255
23.1.4 CJC Calibration................................................................................................................................................... 255
23.1.5 Sensor-Break Limit Check.................................................................................................................................. 255
23.2 To Return to TC4/TC8 Factory Calibration ........................................................................................... 256
23.3 RT4 User calibration.................................................................................................................................. 256
23.3.1 Set Up................................................................................................................................................................... 256
23.3.2 Calibration ........................................................................................................................................................... 256
23.4 To Return to RT4 Factory Calibration .................................................................................................... 256
23.5 Calibration Parameters ............................................................................................................................ 257
24. CHAPTER 24 OEM SECURITY........................................................................................................................ 258
24.1 Introduction................................................................................................................................................ 258
24.2 Using OEM Security.................................................................................................................................. 258
24.3 Step 1 – View iTools OPC Server ............................................................................................................ 259
24.4 Step 2 – Create Custom Tags .................................................................................................................. 260
24.5 Step 3 – Activate OEM Security .............................................................................................................. 262
24.6 Step 4 – Deactivate OEM Security.......................................................................................................... 263
24.7 Erasing Memory ........................................................................................................................................ 263
25. APPENDIX A MODBUS SCADA TABLE........................................................................................................ 264
25.1 Comms Table............................................................................................................................................. 264
25.2 SCADA Table ............................................................................................................................................. 264
25.2.1 Programmer Address Ranges - Decimal ......................................................................................................... 294
25.2.2 Version 2.xx Programmer Addresses - Hexadecimal..................................................................................... 301
26. APPENDIX B DEVICENET PARAMETER TABLES........................................................................................ 308
26.1 IO Re-Mapping Object............................................................................................................................. 308
26.2 Application Variables Object .................................................................................................................. 309
26.2.1 Table Modification.............................................................................................................................................. 313
27. APPENDIX C CANOPEN PARAMETER TABLES.......................................................................................... 314
27.1 Manufacturer Object – Pick List .............................................................................................................. 314
28. APPENDIX D VERSION 1.XX PROGRAMMER ............................................................................................. 318

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28.1 Version 1.xx Parameter Tables ............................................................................................................... 318
28.1.1 Configuring the Programmer (V1.xx)............................................................................................................... 318
28.1.2 To Select, Run, Hold or Reset a Program (V1.xx)............................................................................................ 319
28.1.3 Creating a Program (V1.xx) ............................................................................................................................... 319
28.1.4 To Select, Run, Hold or Reset a Program (Version 1.xx) ............................................................................... 320
28.2 SCADA addresses for Programmer Version 1.xx................................................................................. 320
29. APPENDIX E SAFETY AND EMC INFORMATION ...................................................................................... 326
30. APPENDIX F TECHNICAL SPECIFICATION................................................................................................. 329
30.1 Environmental Specification ................................................................................................................... 329
30.2 Network Communications Support ....................................................................................................... 329
30.3 Configuration Communications Support .............................................................................................. 329
30.4 Fixed I/O Resources.................................................................................................................................. 330
30.5 TC8 8-Channel and TC4 4-Channel TC Input Card.............................................................................. 330
30.6 DO8 8-Channel Digital Output Card ..................................................................................................... 331
30.7 RL8 8-Channel Relay Output Card ......................................................................................................... 331
30.8 CT3 3-Channel Current-Transformer Input Card ................................................................................. 331
30.9 Load Failure Detection............................................................................................................................. 331
30.10 DI8 8-Channel Digital Input Card....................................................................................................... 332
30.11 RT4 Resistance Thermometer Input Card......................................................................................... 332
30.12 AO8 8-Channel and AO4 4-Channel 4-20mA Output Card .......................................................... 332
30.13 Recipes ................................................................................................................................................... 332
30.14 Toolkit Blocks ........................................................................................................................................ 333
30.15 PID Control Loop Blocks...................................................................................................................... 333
30.16 Process Alarms ...................................................................................................................................... 333
30.17 Setpoint Programmer........................................................................................................................... 333
31. PARAMETER INDEX .......................................................................................................................................... 334

MINI8 CONTROLLER: ENGINEERING HANDBOOK
HA028581 Page 9
Issue 15 Nov 15
Issue Record of This Manual
Issue 6 includes Enhanced Devicenet Communications.
Issue 7 corrects terminal numbers in Example 2 section 8.9.2.1, adds references to iTools in sections 1.12 and 1.13 and
adds to section 11.8 ‘Note: from July 09 CANopen option has been discontinued’.
Issue 8 clarifies and completes table 1.6.1.1 (Module status indication), and modifies the specification for Digital inputs
in sections 30.4 and 30.10.
Issue 9 Section 1.6 thin trunk line length changed from 100m to 40m for baud rate of 1M.
Issue 10 adds two parameters ‘ServoToPV’ and ‘SPIntBal’ to the Setpoint Parameter List, update to order code, improve
fallback description, timer and sample and hold diagrams.
Issue 11 adds EtherNet/IP.
Issue 12 adds the Battery Warning below:
!Warning
Back up Battery
This instrument is fitted with a
battery designed to retain
configuration and other settings
in the event of a failure of the
instrument power supply.
This battery has an expected life
of 10 years minimum at a
nominal ambient working
temperature (e.g. 25OC).
The battery life may be reduced
if it is consistently operated in
an elevated ambient
temperature environment.
Maintenance Schedule
A battery failure is only evident following a failure of the instrument power supply.
The battery should be replaced at regular intervals. Between 6 and 10 years is
recommended depending on usage and operating temperature. The battery is
not user serviceable, contact your local service centre to make suitable
arrangements.
On older instruments contact your supplier to have the battery replaced prior to
failure. The age of the instrument is shown on the side label. This contains a
serial number, where the last four characters either show the week number and
year of manufacture WW YY, or a date in the format UK YYWW.
It is important to maintain a record of instrument configurations or use
Eurotherm iTools to make clone copies of fully working instruments. This is
described in section 4.3. Store this securely as a back up to be used to restore
the configuration.
Issue 13 adds section 1.16 Inductive Loads.
Issue 14 adds EtherCat communications and additional Modbus connection details.
Issue 15 adds the Precautions statement in section 11.14.2.

MINI8 CONTROLLER: ENGINEERING HANDBOOK
Page 10 HA028581
Issue 15 Nov 15
Mini8 Multi-Loop Process Controller
1. Chapter 1 Installation
1.1 What Instrument Do I Have?
Thank you for choosing this Mini 8 Controller.
The Mini8 controller is a compact DIN rail mounting multi-loop PID controller and data acquisition unit. It offers a choice
of I/O and a choice of field communications.
The Mini8 controller mounts on 35mm Top Hat DIN Rail. It is intended for permanent installation, for indoor use only,
and to be enclosed in an electrical panel or cabinet.
The Mini8 controller is pre-assembled in the factory to give the I/O required for the application as specified in the order
code. With standard applications the Mini8 controller is also supplied configured. Alternatively, the Mini8 controller is
configured using Eurotherm’s iTools configuration suite running on a personal computer.
All Safety & EMC information is in Appendix E.
The full Technical Specification is in Appendix F.
Whenever the symbol appears in this handbook it indicates a helpful hint

MINI8 CONTROLLER: ENGINEERING HANDBOOK
HA028581 Page 11
Issue 15 Nov 15
1.2 Mini8 Controller Ordering Code
MINI8 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
Accessories
SubMini8/Mechanics/Mtgplate Bulkhead mounting plate SubMini8/Cable/RJ45/0.5 Network 0.5m RS485 cable
SubMini8/Shunt/249R.1 2.49Ω0.1% Burden resistor SubMini8/CD/Std Config tools and manuals
SubMini8/Resistor/Term/Mbus/RJ45 Modbus load terminator SubMini8/Cable/Config Config cable
SubMini8/Resistor/Term/Pbus/RJ45 Profibus load terminator SubMini8/Manual/Inst Installation booklet
SubMini8/Cable/RJ45/3.0 Network 3.0m RS485 cable SubMini8/Manual/Eng Engineering manual
18 Special
XXXXX No special
YYNNNN Special number
1 Basic Product
MINI8 Mini8 Controller
2 Control Loops
ACQ IO Acquisition only (not with EC8). No
loops enabled.
4LP 4 Control loops
8LP 8 Control loops
16LP 16 Control loops
3 Programs
0PRG No Programs
1PRG 1 Profile – 50 programs
XPRG
Multi-profile – 50 programs
If 4 loops are ordered, 4 programmers are
supplied. If 8 or 16 loops are ordered 8
programmers are supplied
4 PSU
VL 24Vdc
5 Communications
MODBUS Non Isolated Modbus RTU slave
ISOLMBUS Isolated Modbus RTU slave
DEVICENET DeviceNet Slave
PBUSRJ45 Profibus Slave RJ45 (Profibus motherboard
fitted)
PBUS9PIN Profibus Slave 9 pin D type (Profibus
motherboard fitted)
ENETMBUS EtherNet Modbus TCP /IP Slave
CANopen Slave (no longer available)
DNETMI2 DeviceNet M12 connector slave
ENETIP EtherNet/IP
ETHERCAT EtherCAT (Slave) (Available from version
V2.7)
6 Temperature Units
C Centigrade
F Fahrenheit
7 - 10 IO Slots 1, 2, 3, 4
XXX No module fitted
TC4 4 Channel TC Input
TC8 8 Channel TC Input
RT4 4 Channel RTD input
RTT 4 Channel RTD input, Pt1000
AO4 4 Channel 4-20mA output (slot 4 only)
Not EC8
AO8 8 Channel 4-20mA output
DO8 8 Channel logic output
CT3 3 Channel CT input (only 1 CT per Mini8)
RL8 8 Channel relay (slots 2, 3 only)
DI8 8 Channel logic input
11 Application
STD No configuration (always available)
EC8
8 Loop extrusion controller (EC8 is a preconfigured
version offering 8 control loops with heat/cool logic
outputs).
Requires 8LP and 250 wires
Slot 1 = TC8
Slot 3 = DO8
Slot 2 = CT3 or None
Slot 4 = DO8
FC8 8 Loop furnace controller with analogue outputs
Requires 8LP and 250 wires
Slot 1 = TC8 Slot 4 = AO8
12 Wires
30 30 User Wires
60 60 User Wires
120 120 User Wires
250 250 User Wires
13 Recipes
None No Recipes
RCP 8 Recipes
14 Manual
ENG English
GER German
FRA French
SPA Spanish
ITA Italian
15 Configuration Software
NONE No configuration software
ITOOLS Itools licence only
16 Warranty
XXXXX Standard
WL005 Extended
17 Calibration Certificates
XXXXX None
CERT1 Certificate of conformity
CERT2 Factory input calibration per input. (5 point calibration)
19 Label
XXXXX No custom label
YYNNN Custom label

MINI8 CONTROLLER: ENGINEERING HANDBOOK
Page 12 HA028581
Issue 15 Nov 15
1.3 How to Install the Controller
This instrument is intended for permanent installation, for indoor use only, and to be enclosed in an electrical panel.
Select a location where minimum vibrations are present and the ambient temperature is within 0 and 50oC (32 and
122oF).
Please read the safety information, Appendix E at the end of this manual, before proceeding and refer to the EMC
Booklet part number HA025497 for further information.
1.3.1 Dimensions
Dimension mm
A 108
B 124
C 115
Figure 1-1: Mini8 Controller Dimensions
1.3.2 To Install the Controller
1. Use 35mm symmetrical DIN Rail to EN50022-35 x 7.5 or 35 x 15,
2. Mount the DIN Rail horizontally as indicated in Figure 1.1. The Mini8 controller is NOT designed to be
mounted in other orientations.
3. Hook the upper edge of the DIN rail clip on the instrument on the top of the DIN rail and push.
4. To remove use a screwdriver to lever down the lower DIN rail clip and lift forward when the clip has
released.
5. A second unit on the same DIN rail may be mounted adjacent to the unit.
6. A second unit mounted above or below the unit requires a gap of at least 25mm between the top of
the lower one and the bottom of the higher one.
1.3.3 Environmental Requirements
Mini8 controller Minimum Maximum
Temperature 0°C 55°C
Humidity (non condensing) 5% RH 95% RH
Altitude 2000m
A
Allow a minimum of 25mm
above and below each unit
Allow a minimum of
25mm for terminals
and cables
CB

MINI8 CONTROLLER: ENGINEERING HANDBOOK
HA028581 Page 13
Issue 15 Nov 15
1.4 Electrical Connections – Common to All Instruments
The Mini8 controller is intended for operation at safe low voltage levels, except the RL8 relay module. Voltages in
excess of 42 volts must not be applied to any terminals other than the RL8 relay module.
A protective earth connection is required.
Do not replace the battery. Return to factory if replacement battery is required.
Figure 1-2: Terminal Layout for Mini8 Controller
1.4.1 Power Supply
The power supply requires a supply between 17.8 to 28.8 V dc, 15 watts maximum
24V Ø 24 V dc
24V Ø 24 V dc
0V Ø 0 V dc
GND Ø Ground
Connector terminals will accept wire sizes from 0.2 to 2.5, 24 to 12 awg.
Note: If the Min8 is used with the VT505 panel ensure that the power supply connectors cannot be mistakenly changed
over. The connectors are physically the same, but the electrical connections are not compatible. Plugging the connector
into the Mini8 controller will short-circuit the 24 volt supply.
Power Supply
Male Connector
24V
24V
0V
GND
Power Supply
User Terminals
Power
Supply
Section 1.4.1
Fixed IO
Section 1.4.2
Instrument
LEDs
section 2
Communications
LEDs
section 2
I/O Slots I to 4
Sections 1.12 to 1.19
Communications
connector
DeviceNet shown
Communications
settings
DeviceNet shown
Communications
Configuration port
Section 4.2

MINI8 CONTROLLER: ENGINEERING HANDBOOK
Page 14 HA028581
Issue 15 Nov 15
1.4.2 Fixed IO Connections
These I/O are part of the power supply board and are always fitted.
Digital Inputs : ON requires +10.8V to +28.8V.
OFF requires -28.8V to +5V
+5V to +10.8v is undefined
Typical drive 2.5mA at 10.8V.
Relays contacts: 1 amp max, 42Vdc. These contacts are NOT rated for mains operation.
1.4.3 Digital Communications Connections
Two communications connections are fitted – a Modbus Configuration port (RJ11) and a Fieldbus port.
The Fieldbus is either Modbus (2 x RJ45 ), DeviceNet, CANopen, Profibus, EtherNet Modbus TCP (10baseT) or EtherNet
IP.
1.4.4 Configuration Port (CC)
The configuration port (Modbus) is on an RJ11 socket. It is always fitted just to the right of the power supply
connections. It is a point to point RS232 connection. Eurotherm supply a standard cable to connect a serial COM port
on a computer to the RJ11 socket, part no. SubMin8/cable/config.
9 pin DF to PC
COM port (RS232)
RJ11
Pin
Function
- 6 N/C
3 (Tx) 5 Rx
2 (Rx) 4 Tx
5 (0v) 3 0v (gnd)
2 N/C
1 N/C (Reserved)
See also section 11.1
1.4.5 Screened Communications Cables
Screened cables should be used. In order to reduce the effects of RF interference the transmission line should be
grounded at both ends of the screened cable. However, care must be taken to ensure that differences in earth
potentials do not allow circulating currents to flow as these can induce common mode signals in the data lines. Where
doubt exists it is recommended that the screen (shield) be grounded at only one section of the network. This applies to
all communications protocols.
Pin 1
Pin 6
Digital Input 1
Digital Input 2
Digital Input common
Relay A n/open
Relay A n/closed
Relay A common
Relay B n/open
Relay B n/closed
Relay B common
D1
D2
C
A1
A2
A3
B1
B2
B3

MINI8 CONTROLLER: ENGINEERING HANDBOOK
HA028581 Page 15
Issue 15 Nov 15
1.5 Electrical Connections for Modbus
For Modbus operation see section 11.3.
Figure 1-3: Front Panel Layout Modbus
1.5.1 Modbus Connectors
In the Mini8 controller two RJ45 sockets are provided on the front panel for modbus connections. One is for the
incoming connection to a PC acting as a master, the second may be used either to loop onto the next instrument or for a
line terminator, see Figure 1-9.
The wiring of the RJ45 plug allows both RS485 3-wire or RS485 4-wire (also known as RS422) connections.
To construct a cable for RS485/RS422 operation use a screened cable with twisted pairs plus a separate core for
common.
RJ45 pin 3 wire 5 wire
8 RxA
7 RxB
6 Ground
5
4
3 Ground Ground
2 A TxA
1 B TxB
Plug shroud to cable screen
The 2000 series Communications Handbook, part number HA026230, gives further information on digital
communications and is available on www.eurotherm.co.uk.
1.5.2 RS485
RS485 also referred to as EIA485 is a standard defining the electrical characteristics of drivers and receivers for use in
balanced digital multipoint systems. A balanced line consists of two identical conductors, other than ground, to transmit
and receive the signal. This is usually referred to as a 2-wire system, or sometimes 3-wire. The two wires consist of a
screened twisted pair of equal length and equal impedances designed to reduce the effects of radiated and received
electromagnetic interference. Terminating resistors are required at either end of the transmission line to reduce the
effects of reflected signals. The EIA-485 standard is, thus, suited for use over long distances and in electrically noisy
environments.
The Mini8 controller also provides connections for RS485 4-wire (RS422). This system consists of two screened twisted
pairs. One pair is used for transmit and the second for receive. A common is also provided.
One or more devices configured as network slaves may be connected to such a network in a linear, multi drop
configuration as described in sections 1.5.4 and 1.5.5.
Pin 8
Pin 1
Address Switch
See section 11.3.2
LED Indicators
See section 2
Modbus
communications
ports RJ45
RN CC FCP A
B
24V
24V
0V
GND
D1
D2
C
1
2
3
1
2
3
A
B
FC
1
2
3
4
1
2
3
4
HHHH
A
A
A
A
P
P
P
P
I
I
I
I

ModBus Mini8
CC
Configuration Port
See section 1.4.4
1 2 3 4 5 6 7 8
ON


MINI8 CONTROLLER: ENGINEERING HANDBOOK
Page 16 HA028581
Issue 15 Nov 15
1.5.3 Direct Connection - Master and One Slave
It is a common requirement to connect one master and one slave. Termination resistors (RT) should be installed at both
the transmitter end and receiver end of the cable. These are particularly required for long cable runs (e.g. 2m to 200m)
although for short local connections it may be found that these are not strictly necessary.
A Modbus terminator is available from your supplier which is designed to fit into the spare RJ45 connector on the Mini8
controller. The order code is SubMin8/RESISTOR/MODBUS/RJ45. It is coloured black.
Example 1: This connection uses 2-wire RS485.
For 2-wire both master and slave ends act as Tx and Rx
Figure 1-4: RS485 two-wire Connections
Example 2: This connection uses 4-wire RS485 (RS422).
Figure 1-5: RS485 Four-wire Connections
RTRT
Master Slave
Twisted
pair
0V
0V
A
B
B
A
ScreenEarth at
one end RT= Termination resistor
B
A
B
A
RT= Termination resistor
RT
RT
Master Slave
RX
RX
TX
TX
0V
0V
Twisted
pair
Twisted
pair
ScreenEarth at
one end
A
B
A
B

MINI8 CONTROLLER: ENGINEERING HANDBOOK
HA028581 Page 17
Issue 15 Nov 15
1.5.4 RS485 to RS232 Converter
In practice it is often necessary to use a buffer to convert RS485 (or RS422) connections from the Mini8 controller to the
RS232 port of the PC. The Eurotherm Controls KD485 Communications Adapter unit is recommended for this purpose.
The use of a RS485 board built into the computer is not recommended since this board may not be isolated and the RX
terminals may not be biased correctly for this application. This may cause noise problems or damage to the computer,
In order to make the connections between the KD485 convertor and the RJ45 connection on the Mini8 controller, either
cut a patch cable and connect the open end to the KD485 converter or, using twin screened cable, crimp an RJ45 plug
on the Mini8 controller end.
Connections for a KD485 convertor are shown in the following diagrams.
Figure 1-6: KD485 Communications Convertor - 2-wire Connections
Figure 1-7: KD495 Communications Convertor - 4-wire Connections
The above diagrams assume a serial port on the PC. For a PC using USB a USB to serial convertor is required between
the PC and KD485.
220 Ohm termination resistor on
the Rx of the converter unit
Type KD485
converter
RS232 RS485
Tx
RxA
RxB
Com
TxA
TxB
Screened cable,
see section 1.4.5
Rx
Com
Mini8
controller
A (2)
B (1)
Com (3)
RJ45
connector
RJ45
terminator
220 Ohm termination resistor
on the Rx of the converter unit
Type KD485
converter
RS232 RS485
Tx
RXA
Screened cable,
see section 1.4.5
Rx
Com
Mini8
controller
RJ45 connector
(size exaggerated
for clarity)
RJ45
terminator
TXA (2)
TXB (1)
Com (3)
RXA (8)
RXB (7)
RXB
Com
TXB
TXA

MINI8 CONTROLLER: ENGINEERING HANDBOOK
Page 18 HA028581
Issue 15 Nov 15
1.5.5 One Master, Multiple slaves Short Network
The RS485 standard allows one or more instruments to be connected (multi dropped) using a 2-wire or 4-wire
connection, with cable length of less than 1200m. Up to 31 slaves and one master may be connected. Slaves may be
Mini8 controllers or other instruments such as Eurotherm controllers or indicators.
The communication line must be daisy chained from device to device and, if the communications line is more than
around two meters long, it must be correctly terminated. A Modbus terminator containing the correct termination
resistors is available from Eurotherm, order code: SubMin8/RESISTOR/MODBUS/RJ45.
The Modbus terminator is coloured BLACK.
Figure 1-8: Multiple Slaves - Overview
Figure 1-9: Multiple Slaves - RS485 2-wire Connections
Master
Slave 2
Slave n
Line terminator on the last
instrument in the line
Daisy chained,
screened, twisted
pair cables
Slave 1
220 Ohm termination resistor on
the Rx of the converter unit
Type KD485
converter
RS232 RS485
Tx
RxA
Screened cable,
see section 1.4.5
Rx
Com
Mini8 (1)
A (2)
B (1)
Com (3)
RJ45
connector
Mini8 (n)
A (2)
B (1)
Com (3)
RJ45
connector
RJ45
terminator
A (2)
B (1)
Com (3)
RJ45
connector
RxB
Com
TxA
TxB