Mitsubishi Electric MELSECSystem Q User manual

MELSEC System Q
Programmable Logic Controllers
User’s Manual
Temperature Control Modules
Q64TCTT, Q64TCTTBW,
Q64TCRT, Q64TCRTBW
GX Configurator-TC
(SW0D5C-QTCU-E)
INDUSTRIAL AUTOMATION
MIT
SU
BI
S
HI ELE
C
TRI
C
MIT
SU
BI
S
HI ELE
C
TRI
C
Art. no.: 134388
10 02 2003
SH (NA)-080121-E

A - 1 A - 1
•SAFETY PRECAUTIONS •
(Always read these instructions before using this equipment.)
Before using this product, please read this manual and the relevant manuals introduced in this manual
carefully and pay full attention to safety to handle the product correctly.
The instructions given in this manual are concerned with this product. For the safety instructions of the
programmable controller system, please read the CPU module User's Manual.
In this manual, the safety instructions are ranked as "DANGER" and "CAUTION".
!DANGER
CAUTION
!
Indicates that incorrect handling may cause hazardous conditions,
resulting in death or severe injury.
Indicates that incorrect handling may cause hazardous conditions,
resulting in medium or slight personal injury or physical damage.
Note that the !CAUTION level may lead to a serious consequence according to the circumstances.
Always follow the instructions of both levels because they are important to personal safety.
Please save this manual to make it accessible when required and always forward it to the end user.
[Design Precautions]
!DANGER
•Do not write data into the "read-only area" in the buffer memory of the intelligent function
module. In addition, do not turn on/off the "reserved" signals among the I/O signals transferred
to/from the PLC CPU.
Doing so can malfunction the PLC system.
•Depending on the malfunction of the external output transistor, there may be cases where the
output is ON or OFF status. Install external monitoring circuitry for output signals that may lead
to major accidents.
!CAUTION
•Do not bunch the control wires or communication cables with the main circuit or power wires, or
install them close to each other.
They should be installed 100 mm(3.94 inch) or more from each other.
Not doing so could result in noise that may cause malfunction.

A - 2 A - 2
[Installation Precautions]
!CAUTION
•Use the PLC in an environment that meets the general specifications contained in the CPU
User's Manual.
Using this PLC in an environment outside the range of the general specifications may cause
electric shock, fire, malfunction, and damage to or deterioration of the product.
•When installing the module, securely insert the module fixing tabs into the mounting holes of the
base module while pressing the installation lever located at the bottom of the module downward.
Improper installation may result in malfunction, breakdown or the module coming loose and
dropping. Securely fix the module with screws if it is subject to vibration during use.
•Tighten the screws within the range of specified torque.
If the screws are loose, it may cause the module to fallout, short circuits, or malfunction.
If the screws are tightened too much, it may cause damage to the screw and/or the module,
resulting in fallout, short circuits or malfunction.
•Switch all phases of the external power supply off when mounting or removing the module.
Not ding so may cause electric shock or damage to the module.
The system that uses the QnPHCPU allows you to change a module online. Note that there are
restrictions on the modules that can be changed online and each module has a predetermined
changing procedure. For details, refer to the chapter of online module change in this manual.
•Do not directly touch the conductive area or electronic components of the module.
Doing so may cause malfunction or failure in the module.
[Wiring Precautions]
!CAUTION
•Be careful not to let foreign matters such as sawdust or wire chips get inside the module.
They may cause fires, failure or malfunction.
•The top surface of the module is covered with protective film to prevent foreign objects such as
cable offcuts from entering the module when wiring.
Do not remove this film until the wiring is complete.
Before operating the system, be sure to remove the film to provide adequate heat ventilation.
•Be sure to fix communication cables or power supply cables leading from the module by placing
them in the duct or clamping them.
Cables not placed in the duct or without clamping may hang or shift, allowing them to be
accidentally pulled, which may cause a module malfunction and cable damage.
•Do not grab on the cable when removing the communication or power cable connected to the
module.
When disconnecting a cable without a connector, first loosen the screws on the part that is
connected to the module.
Pulling the cable when it is still connected to the module may cause damage to the module or
cable, or misoperation due to cable contact failure.

A - 3 A - 3
[Wiring Precautions]
!DANGER
•Always ground the shielded cable for the PLC.
There is a risk of electric shock or malfunction.
•When wiring, be sure to verify the rated voltage of the product as well as the terminal layout. Fire
or failure may result if incorrect voltage is input or incorrect wiring is performed.
•Connecting terminals with incorrect voltage may result in malfunction or mechanical failure.
[Startup/Maintenance Precautions]
!CAUTION
•Do not disassemble or modify the module.
Doing so could cause failure, malfunction, injury or fire.
•Switch all phases of the external power supply off when mounting or removing the module.
Not doing so may cause failure or malfunction of the module.
The system that uses the QnPHCPU allows you to change a module online. Note that there are
restrictions on the modules that can be changed online and each module has a predetermined
changing procedure. For details, refer to the chapter of online module change in this manual.
•Do not touch the connector while the power is on.
Doing so may cause malfunction.
•Switch all phases of the external power supply off when cleaning or retightening the terminal
screws and module installation screws.
Not doing so may cause failure or malfunction of the module.
If the screws are loose, it may cause the module to fallout, short circuits, or malfunction.
If the screws are tightened too much, it may cause damages to the screws and/or the module,
resulting in the module falling out, short circuits or malfunction.
•Always make sure to touch the grounded metal to discharge the electricity charged in the body,
etc., before touching the module.
Failure to do so may cause a failure or malfunctions of the module.
[Disposal Precautions]
!CAUTION
•When disposing of the product, handle it as industrial waste.

A - 4 A - 4
REVISIONS * The manual number is given on the bottom left of the back cover.
Print Date Manual Number Revision
Oct., 2000 SH (NA)-080121-A First edition
Jun., 2001 SH (NA)-080121-B Standardize the name from software package (GPP function) to Product
name (GX Developer).
Standardize the name from utility package (QTCU) to Product name (GX
Configurator-TC).
Addition
Section 1.4, Section 2.1, 2.2
Correction
Conformation to the EMC Directive and Low Voltage Instruction, About
the Generic Terms and Abbreviations, Product Structure, Section 3.5.47,
Section 5.2, 5.2.1, 5.2.2, 5.3.3, 5.6
Feb., 2002 SH (NA)-080121-C Add the contents of the function version C
Addition
Chapter 7
Renumbering
Chapter 7 Chapter 8
Correction
SAFETY PRECAUTIONS, About the Generic Terms and Abbreviations,
Section 2.1, 2.2, Section 3.1.1, 3.2, 3.2.1, 3.2.10, 3.2.11, 3.5.1, 3.5.11,
3.5.20, 3.5.32, 3.5.42, Section 4.3, Section 5.2.1, 5.2.2, Section 6.2.2,
6.3, Section 8.1
Aug., 2002 SH (NA)-080121-D Correction
Section 2.1, Section 3.1, 3.2.1, 3.2.7, 3.5.1, 3.5.12, 3.5.15, 3.5.20, 3.5.26,
3.5.34, 3.5.35, 3.5.44, 3.5.45, 3.5.49, 3.5.51, 3.5.52, Section 6.3, Section
8.10
Feb., 2003 SH (NA)-080121-E Correction
SAFETY PRECAUTIONS, INTRODUCTION, CONTENTS, Section 2.1,
Section 3.1.1, Section 3.5.38, Section 5.2.2, Section 5.3.3, Section 5.4 to
Section 5.6
Japanese Manual Version SH-080108-G
This manual confers no industrial property rights or any rights of any other kind, nor does it confer any patent
licenses. Mitsubishi Electric Corporation cannot be held responsible for any problems involving industrial property
rights which may occur as a result of using the contents noted in this manual.
2000 MITSUBISHI ELECTRIC CORPORATION

A - 5 A - 5
INTRODUCTION
Thank you for the purchasing the MELSEC-Q series PLC.
Before using the equipment, please read this manual carefully to develop full familiarity with the functions
and performance of the Q series PLC you have purchased, so as to ensure correct use.
CONTENTS
SAFETY PRECAUTIONS .............................................................................................................................A- 1
REVISIONS....................................................................................................................................................A- 4
INTRODUCTION............................................................................................................................................A- 5
CONTENTS....................................................................................................................................................A- 5
Conformation to the EMC Directive and Low Voltage Instruction................................................................A- 9
About the Generic Terms and Abbreviations................................................................................................A-10
Product Structure ...........................................................................................................................................A-10
1 GENERAL DESCRIPTION 1- 1 to 1-12
1.1 Features ...................................................................................................................................................1- 3
1.2 The PID Control System..........................................................................................................................1- 5
1.3 About the PID Operation..........................................................................................................................1- 6
1.3.1 Operation method and formula.........................................................................................................1- 6
1.3.2 The Q64TC actions...........................................................................................................................1- 7
1.3.3 Proportional action (P-action) ...........................................................................................................1- 8
1.3.4 Integral action (I-action) ....................................................................................................................1- 9
1.3.5 Derivative action (D-action)...............................................................................................................1-10
1.3.6 PID action..........................................................................................................................................1-11
1.4 Functions Added to Function Version B and Later.................................................................................1-12
2 SYSTEM CONFIGURATION 2- 1 to 2- 4
2.1 Applicable Systems..................................................................................................................................2- 1
2.2 How to Check the Function Version and Software Version....................................................................2- 3
3 SPECIFICATIONS 3- 1 to 3-48
3.1 Performance Specifications.....................................................................................................................3- 1
3.1.1 Performance specifications of the Q64TC .......................................................................................3- 1
3.1.2 Usable temperature sensor types, measurement temperature ranges and data resolutions........3- 3
3.2 Function Summary...................................................................................................................................3- 4
3.2.1 Auto tuning function...........................................................................................................................3- 5
3.2.2 Reverse/Forward action select function ...........................................................................................3- 9
3.2.3 RFB limiter function...........................................................................................................................3- 9
3.2.4 Sensor compensation function .........................................................................................................3- 9
3.2.5 Unused channel setting.....................................................................................................................3-10
3.2.6 Forced PID control stop ....................................................................................................................3-10
3.2.7 Heater disconnection detection function (supported only by Q64TCTTBW, Q64TCRTBW).........3-11
3.2.8 Output off-time current error detection function
(available for Q64TCTTBW and Q64TCRTBW only).....................................................................3-12
3.2.9 Loop disconnection detection function .............................................................................................3-12

A - 6 A - 6
3.2.10 Data storage on E2PROM...............................................................................................................3-13
3.2.11 Alert alarms .....................................................................................................................................3-15
3.2.12 Control output setting at CPU stop error occurrence.....................................................................3-19
3.2.13 Q64TC control status controlling output signal and
buffer memory settings and control status.....................................................................................3-20
3.3 Sampling Period and Control Output Period...........................................................................................3-21
3.4 I/O Signals Transferred to/from the PLC CPU........................................................................................3-22
3.4.1 I/O signal list......................................................................................................................................3-22
3.4.2 Input signal functions.........................................................................................................................3-23
3.4.3 Output signal functions......................................................................................................................3-26
3.5 Buffer Memory..........................................................................................................................................3-28
3.5.1 Buffer memory list .............................................................................................................................3-28
3.5.2 Write data error code (buffer memory address: 0H).........................................................................3-30
3.5.3 Decimal point position (buffer memory address: 1Hto 4H) ..............................................................3-30
3.5.4 Alert definition (buffer memory address: 5Hto 8H)...........................................................................3-31
3.5.5 Temperature process value (PV value, buffer memory address: 9Hto CH)....................................3-31
3.5.6 Manipulated value (MV value, buffer memory address: DHto 10H)................................................3-32
3.5.7 Temperature rise judgment flag (buffer memory address: 11Hto 14H)...........................................3-32
3.5.8 Transistor output flag (buffer memory address: 15Hto 18H)............................................................3-32
3.5.9 Cold junction temperature process value (buffer memory address: 1DH).......................................3-33
3.5.10 MAN mode shift completion flag (buffer memory address: 1EH)...................................................3-33
3.5.11 E2PROM's PID constant read/write flag (buffer memory address: 1FH).......................................3-34
3.5.12 Input range (buffer memory address: 20H, 40H, 60H, 80H).............................................................3-35
3.5.13 Stop mode setting (buffer memory address: 21H, 41H, 61H, 81H)..................................................3-36
3.5.14 Set value (SV) setting (buffer memory address: 22H, 42H, 62H, 82H)............................................3-37
3.5.15 PID constant setting
(buffer memory address: 23Hto 25H, 43Hto 45H, 63Hto 65H, 83Hto 85H) ...................................3-37
3.5.16 Alert alarm 1 to 4 setting
(buffer memory address: 26Hto 29H, 46Hto 49H, 66Hto 69H, 86Hto 89H) ...................................3-37
3.5.17 Upper/lower output limiter setting
(buffer memory address: 2AH, 2BH, 4AH, 4BH, 6AH, 6BH, 8AH, 8BH) ............................................3-37
3.5.18 Output variation limiter setting (buffer memory address: 2CH, 4CH, 6CH, 8CH)............................3-38
3.5.19 Sensor compensation value setting (buffer memory address: 2DH, 4DH, 6DH, 8DH)...................3-38
3.5.20 Adjustment sensitivity (dead band) setting (buffer memory address: 2EH, 4EH, 6EH, 8EH).........3-38
3.5.21 Control output period setting (buffer memory address: 2FH, 4FH, 6FH, 8FH)................................3-39
3.5.22 Primary delay digital filter setting (buffer memory address: 30H, 50H, 70H, 90H)..........................3-39
3.5.23 Control response parameter setting (buffer memory address: 31H, 51H, 71H, 91H) .....................3-40
3.5.24 AUTO/MAN setting (buffer memory address: 32H, 52H, 72H, 92H)................................................3-40
3.5.25 MAN output setting (buffer memory address: 33H, 53H, 73H, 93H)................................................3-41
3.5.26 Setting change rate limiter setting (buffer memory address: 34H, 54H, 74H, 94H).........................3-41
3.5.27 AT bias setting (buffer memory address: 35H, 55H, 75H, 95H).......................................................3-41
3.5.28 Forward/reverse action setting (buffer memory address: 36H, 56H, 76H, 96H)..............................3-42
3.5.29 Upper/lower setting limiter
(buffer memory address: 37H, 38H, 57H, 58H, 77H, 78H, 97H, 98H)................................................3-42
3.5.30 Heater disconnection alert setting (buffer memory address: 3AH, 5AH, 7AH, 9AH).......................3-42
3.5.31 Loop disconnection detection judgment time setting
(buffer memory address: 3BH, 5BH, 7BH, 9BH)..............................................................................3-42
3.5.32 Loop disconnection detection dead band setting
(buffer memory address: 3CH, 5CH, 7CH, 9CH) .............................................................................3-43

A - 7 A - 7
3.5.33 Unused channel setting (buffer memory address: 3DH, 5DH, 7DH, 9DH)......................................3-43
3.5.34 E2PROM's PID constant read command (buffer memory address: 3EH, 5EH, 7EH, 9EH)............3-43
3.5.35 Automatic backup setting after auto tuning of PID constants
(buffer memory address: 3FH, 5FH, 7FH, 9FH)...............................................................................3-44
3.5.36 Alert dead band setting (buffer memory address: A4H).................................................................3-44
3.5.37 Alert delay count setting (buffer memory address: A5H)................................................................3-44
3.5.38 Heater disconnection/output off-time current detection delay count setting
(buffer memory address: A6H)........................................................................................................3-44
3.5.39 Temperature rise completion range setting (buffer memory address: A7H)..................................3-45
3.5.40 Temperature rise completion soak time setting (buffer memory address: A8H)...........................3-45
3.5.41 PID continuation flag (buffer memory address: A9H).....................................................................3-45
3.5.42 Heater disconnection compensation function selection (buffer memory address: AAH)..............3-45
3.5.43 Transistor ON delay output delay time setting (buffer memory address: AFH).............................3-45
3.5.44 CT monitor method switching (buffer memory address: B0H).......................................................3-46
3.5.45 Manipulated value
(MV value, 0 to 4000/0 to 12000/0 to 16000, buffer memory address: B1Hto B4H)....................3-46
3.5.46 Manipulated value resolution switching (buffer memory address: B5H)........................................3-46
3.5.47 Auto tuning mode selection (buffer memory address: B8Hto BBH) ..............................................3-46
3.5.48 Alert alarm 1 to 4 mode setting
(buffer memory address: C0Hto C3H, D0Hto D3H, E0Hto E3H, F0Hto F3H)................................3-47
3.5.49 Heater current measurement value (buffer memory address: 100Hto 107H)...............................3-47
3.5.50 CT input channel assignment setting (buffer memory address: 108Hto 10FH)............................3-48
3.5.51 CT selection (buffer memory address: 110Hto 117H)....................................................................3-48
3.5.52 Reference heater current value (buffer memory address: 118Hto 11FH).....................................3-48
4 SETUP AND PROCEDURE BEFORE STARTING THE OPERATION 4- 1 to 4-13
4.1 Handling Precautions...............................................................................................................................4- 1
4.2 Procedure Before Starting the Operation................................................................................................4- 2
4.3 Parts Identification....................................................................................................................................4- 3
4.4 Wiring........................................................................................................................................................4- 6
4.4.1 Wiring precautions.............................................................................................................................4- 6
4.4.2 External wiring...................................................................................................................................4- 7
4.4.3 Heater disconnection detection wiring and setting example for use of three-phase heater...........4-11
4.5 Switch Settings for the Intelligent Function Module................................................................................4-12
5 UTILITY PACKAGE (GX Configurator-TC) 5- 1 to 5-19
5.1 Utility Package Functions ........................................................................................................................5- 1
5.2 Installing and Uninstalling the Utility Package.........................................................................................5- 3
5.2.1 User precautions...............................................................................................................................5- 3
5.2.2 Operating environment......................................................................................................................5- 5
5.3 Explanation of Utility Package Operations..............................................................................................5- 6
5.3.1 How to perform common utility package operations........................................................................5- 6
5.3.2 Operation overview ...........................................................................................................................5- 8
5.3.3 Starting the intelligent function utility ................................................................................................5-10
5.4 Initial Settings...........................................................................................................................................5-12
5.5 Auto Refresh ............................................................................................................................................5-15
5.6 Monitor/Test .............................................................................................................................................5-17

A - 8 A - 8
6 PROGRAMMING 6- 1 to 6- 6
6.1 Programming Procedure..........................................................................................................................6- 2
6.2 Program Example Written Using GX Configurator-TC...........................................................................6- 3
6.2.1 GX Configurator-TC operation..........................................................................................................6- 3
6.2.2 Program example..............................................................................................................................6- 4
6.3 Program Example Written without Using GX Configurator-TC ..............................................................6- 5
7 ONLINE MODULE CHANGE 7- 1 to 7-13
7.1 Online Module Change Conditions..........................................................................................................7- 1
7.2 Online Module Change Operations.........................................................................................................7- 2
7.3 Online Module Change Procedure..........................................................................................................7- 3
7.3.1 GX Configurator-TC was used for initial setting...............................................................................7- 3
7.3.2 Sequence program was used for initial setting ................................................................................7- 8
7.4 Precautions for Online Module Change..................................................................................................7-13
8 TROUBLESHOOTING 8- 1 to 8- 8
8.1 Error Code List.........................................................................................................................................8- 1
8.2 Processing Performed by Q64TC at Error Occurrence..........................................................................8- 2
8.3 If the RUN LED Has Flickered or Turned Off..........................................................................................8- 3
8.4 If the ERR. LED Has Turned On or Flickered.........................................................................................8- 3
8.5 If the ALM LED Has Turned On or Flickered..........................................................................................8- 3
8.6 If the Module Ready Flag (Xn0) Does Not Turn ON...............................................................................8- 4
8.7 If the Write Error Flag (Xn2) Has Turned ON..........................................................................................8- 4
8.8 If the Hardware Error Flag (Xn3) Has Turned ON..................................................................................8- 4
8.9 If the Alert Occurrence Flag (XnC to XnF) Has Turned ON...................................................................8- 4
8.10 Checking the Q64TC Status by System Monitoring of GX Developer.................................................8- 5
APPENDIX Appendix- 1 to Appendix- 3
Appendix 1 External Dimension Diagram ........................................................................................Appendix- 1
INDEX Index- 1 to Index- 2

A - 9 A - 9
Conformation to the EMC Directive and Low Voltage Instruction
For details on making Mitsubishi PLC conform to the EMC directive and low voltage
instruction when installing it in your product, please see Chapter 3, "EMC Directive
and Low Voltage Instruction" of the User's Manual (Hardware) of the PLC CPU to
use.
The CE logo is printed on the rating plate on the main body of the PLC that conforms
to the EMC directive and low voltage instruction.
The following wiring is required for conformance of this product with the EMC
Directive and Low Voltage Directive.
(1) Use shielded cables for all external wiring and use the AD75CK cable clamp to
ground this product to an enclosure.
Q64TC
20cm (7.88 inch) to
30cm (11.82 inch)
AD75CK
Strip the sheath.
Inside control box
(2) Using the AD75CK, you can tie four cables of about 7mm outside diameter
together for grounding.
(3) The following number of AD75CKs will be needed.
(Assuming that 7mm-diameter cables are used for all wiring)
Number of channels used
Number of AD75CKs needed 1234
01122
11223
21223
32233
42233
52334
62334
73344
Number of CT
channels used
83344

A - 10 A - 10
About the Generic Terms and Abbreviations
Unless otherwise specified, this manual uses the following generic terms and
abbreviations to describe the Temperature control module.
Generic term/abbreviation Description
Personal computer DOS/V-compatible personal computer of IBM PC/ATRor its compatible
GX Developer Generic product name of the product types SWnD5C-GPPW-E, SWnD5C-GPPW-EA, SWnD5C-GPPW-EV and SWnD5C-GPPW-EVA.
"n" in the model name is 4 or greater.
QCPU (Q mode) Generic term of the Q00JCPU, Q00CPU, Q01CPU, Q02CPU, Q02HCPU, Q06HCPU,
Q12HCPU, Q25HCPU, Q12PHCPU and Q25PHCPU.
QnPHCPU Generic term of the Q12PHCPU and Q25PHCPU.
GX Configurator-TC Generic term of temperature control module setting/monitoring tool GX Configurator-
TC(SW0D5C-QTCU-E)
Q64TCTT Abbreviation of Type Q64TCTT temperature control module
Q64TCTTBW Abbreviation of Type Q64TCTTBW temperature control module with disconnection
detection function
Q64TCRT Abbreviation of Type Q64TCRT temperature control module
Q64TCRTBW Abbreviation of Type Q64TCRTBW temperature control module with disconnection
detection function
Q64TC Generic term of Type Q64TCTT, Q64TCTTBW, Q64TCRT and Q64TCRTBW
Product Structure
The product structure of the product is given in the table below.
Model code Product name Quantity
Q64TCTT Type Q64TCTT temperature control module 1
Q64TCTTBW Type Q64TCTTBW temperature control module with disconnection
detection function 1
Q64TCRT Type Q64TCRT temperature control module 1
Q64TCRTBW Type Q64TCRTBW temperature control module with disconnection
detection function 1
SW0D5C-QTCU-E GX Configurator-TC Version 1 (1-license product) (CD-ROM) 1
SW0D5C-QTCU-EA GX Configurator-TC Version 1 (Multiple-license product) (CD-ROM) 1

1 - 1 1 - 1
MELSEC-Q
1 GENERAL DESCRIPTION
1 GENERAL DESCRIPTION
This manual deals with the specifications, handling and instructions wiring and
programming methods of the following temperature control modules used with the
MELSEC-Q series PLC CPU module (hereafter abbreviated to the PLC CPU).
• Type Q64TCTT temperature control module
• Type Q64TCRT temperature control module
• Type Q64TCTTBW temperature control module with disconnection detection function
• Type Q64TCRTBW temperature control module with disconnection detection function
(1) What are Q64TCTT and Q64TCRT?
(a) The Q64TCTT and Q64TCRT are modules designed to convert input values
from external temperature sensors into 16-bit signed BIN (binary) data,
perform PID operations to attain target temperatures, and provide transistor
outputs for temperature control.
(b) The Q64TCTT and Q64TCRT have an auto tuning function which
automatically sets the proportional band (P), integral time (I) and derivative
time (D) for PID operations.
(c) The Q64TCTT accepts K, J, T, B, S, E, R, N, U, L, PL II and W5Re/W26Re
type thermocouples. The Q64TCRT accepts Pt100 and JPt100 type platinum
temperature-measuring resistors.
Buffer memory
PLC CPU Q64TCTT,Q64TCRT
Initial
setting
(TO
instruction)
Set value
Set value
PID
operation
Process value
Process
value
Manipulated value
Temperature
Device
to be
controlled
Input from temperature
sensor
Transistor output
(ON/OFF pulse)
CH1
CH4
CH4
CH4
CH1
CH1
CH1
CH1
Manipulated
value
Manipulated
value
Fig. 1.1 Q64TCTT or Q64TCRT Processing Outline
REMARK
1) Refer to Section 3.2.1 for the auto tuning function
2) Refer to Section 3.1.2 for the measured temperature ranges of the temperature
sensors that can be connected to the Q64TC.
1

1 - 2 1 - 2
MELSEC-Q
1 GENERAL DESCRIPTION
(2) What are Q64TCTTBW and Q64TCRTBW?
The Q64TCTTBW and Q64TCRTBW are Q64TCTT and Q64TCRT-based
modules which have the additional function to detect a heater wire disconnection
using inputs from external current sensors.
Buffer memory
PLC CPU Q64TCTTBW,Q64TCRTBW
Initial
setting
(TO
instruction)
Set value
Set value
PID
operation
Process value
Process
value
Manipulated
value
Manipulated
value
Manipulated value
Temperature
Device
to be
controlled
Input from temperature
sensor
Transistor output
(ON/OFF pulse)
CH1
CH4
CH4
CH4
CH1
CH1
Alarm
CH4
CH1
Disconnection
detection
Current
sensor
CH1
CH1
Fig. 1.2 Q64TCTTBW or Q64TCRTBW Processing Outline
REMARK
1) Refer to Section 3.2.7 for the disconnection detection function of the
Q64TCTTBW and Q64TCRTBW.
1

1 - 3 1 - 3
MELSEC-Q
1 GENERAL DESCRIPTION
1.1 Features
The Q64TC has the following features.
(1) Optimum temperature adjustment control (PID control)
(a) The Q64TC exercises temperature adjustment control automatically by
merely setting the PID constants (proportional band (P), integral time (I),
derivative time (D)) and temperature set value (set value: SV) necessary for
PID operations.
Therefore, no special instructions are needed to perform PID control.
(b) Using the auto tuning function enables the PID constants to be set
automatically by the Q64TC.
Hence, you can use the equipment without being conscious of cumbersome
PID operation expressions to find the PID constants.
(2) 4 loops on 1 module
The module provides a maximum of four loops at the same time for temperature
adjustment control.
(3) RFB limiter function
The RFB (Reset FeedBack) limiter suppresses overshooting which is liable to
occur at a startup or when a temperature set value (SV) is increased.
(4) Sensor compensation function
By setting a sensor compensation value, the sensor compensation function
eliminates a difference between a temperature process value (PV) and an actual
temperature, if any.
(5) Connection of thermocouples compatible with JIS, IEC, NBS,
ASTM and DIN Standards
(a) The Q64TCTT(BW) accepts the following thermocouples compatible with the
JIS, IEC, NBS, ASTM and DIN Standards.
• JIS Standards : R, K, J, S, B, E, T • IEC Standards: R, K, J, S, B, E, T, N
• NBS Standards : PL II • ASTM Standards: W5re, W23re
• DIN Standards : U, L
(b) The Q64TCTT(BW) allows you to set the temperature measurement ranges
which meet the operating temperatures of the above thermocouples.
(6) Connection of Pt100 and JPt100 platinum temperature-measuring
resistors
The Q64TCTT(BW) allows you to set the temperature measurement ranges
which meet the operating temperatures of the Pt100 and JPt100.

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(7) Choice of fine temperature measurement units and various control
temperature ranges
The temperature measurement unit of each loop can be set to 1°C or 0.1°C in
Centigrade or to 1°F or 0.1°F in Fahrenheit, enabling you to choose appropriate
resolution for control. Also, the controllable temperature range can be selected
from 0.0 to 400.0°C (when K type thermocouple is used), 0.0 to 3000.0°C (when
R type thermocouple is used) and others, enabling you to make adequate setting
for the object to be controlled.
(8) E2PROM for backing up set values
The set values in buffer memory can be stored into E2PROM for data backup.
Using the test function of GX Developer to write data directly to the buffer
memory, what is required in a sequence program is "LD " + "OUT Yn1" at the
minimum.
(9) Detection of disconnection
The Q64TCTTBW and Q64TCRTBW can detect the disconnection of a heater.
(10) Utility package for ease of setting
The optional utility package (GX Configurator-TC) is available.
Though you are not required to use the utility package, it allows initial and
automatic refresh settings to be made on the screen, reducing sequence
programs and also enabling you to check the setting and operating states and
execute auto tuning easily.

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1.2 The PID Control System
(1) The PID control system
Figure 1.3 indicates the system configuration when performing PID control.
Set value data
storage
process value
data storage
PID operation
Sensor
Control
object
Q64TC
SV
PV
MV Manipulated value
data storage
Fig. 1.3 The PID control system
(2) PID control procedure
The PID control is performed in the procedure shown in Figure 1.4 below:
Read the PV value
Perform PID
operation
Output MV
Import a signal from the temperature sensor and write
it to the process value storage area as a PV value.
Perform PID operation using the SV/PV values in the
set value/process value storage area.
Convert MV value obtained by the PID operation
to transistor -output on time and output it.
Fig. 1.4 PID control procedure
(3) PID control (simplified two-level response selection)
In general, when the P, I, and D constants to improve the "response to the
setting" are set, the "response to the disturbance" degrades by the PID control.
Conversely, when the P, I, and D constants to improve the "response to the
disturbance" are set, the "response to the setting" degrades by the PID control.
In the PID control (simplified two-level response selection) of this module, "fast",
"normal", or "slow" can be selected for the "response to the setting" while the P, I,
and D constants for better "response for the disturbance" are selected.
Response to the change of the set value
Set
v
alue
(SV)
Normal
Fast
Slow
Set
value
(SV)
Response to the disturbance
Fig. 1.5 simplified two-level response selection

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1.3 About the PID Operation
The Q64TC can perform PID control in process-value incomplete differentiation.
1.3.1 Operation method and formula
The PID control in process-value incomplete differentiation is an operation method
which puts the first-order delay filter as the input for derivative control action, and
performs PID operation with the error value (E) after deleting the high-frequency noise
component.
(1) The algorithm of the PID control in process-value incomplete
differentiation is shown in Figure 1.6.
SV(Set value)
Q64TC
++
--
Disturbance D
Control object
PV(Process value)
MV
: Proportional gain
: Integral time
: Derivative time
G(s)
Control response
parameters Kp(1+ )
1
Kp TD s
1+ TD S
Slow
Normal control
Fast
Ti s
Kp
Ti
TD
S: Derivative gain : Laplace transform conversion
Fig. 1.6 Algorithm of PID control in process-value incomplete differentiation
(2) The formula used for Q64TC is shown below:
M
V n= MV n-1 +TD
+TD(PV n-1 - PV n) - TDMV n-1
: Sampling period
MV : Incomplete derivative output
PV : Process value
TD: Derivative time
: Derivative gain

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1.3.2 The Q64TC actions
The Q64TC performs PID operations in reverse action and forward action.
(1) Reverse action
In a reverse action, the process value (PV) increases toward the set value (SV)
as the manipulation value (MV) increases.
The reverse action is effective for heat control.
(2) Forward action
In a forward action, the process value (PV) decreases toward the set value (SV)
as the manipulation value (MV) increases.
The forward action is effective for cooler control.
Forward action
(when used for cooling control)
Reverse action
(when used for heat control)
Process value
Time
Set
value
Temperature Temperature
Set
value
Time
Process value
Fig. 1.7 Process control example in reverse action and forward action

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1.3.3 Proportional action (P-action)
(1) The proportional action is an action to obtain the manipulation value proportional to
the deviation (difference between set value and process value).
(2) With the proportional action, the relationship between the changes in the deviation
and manipulation value can be expressed in the following formula:
KP EMV =
where Kp is a proportional constant and is called the proportional gain.
(3) The proportional action for the step response when the error value is constant is
shown in Figure 1.8.
(4) The manipulation value changes between -5.0% and 105.0 %. As the Kp
increases, the manipulation value for the same error value becomes larger, and the
corrective action becomes stronger.
(5) The proportional action will generate an offset (remaining deflection).
KP E
E
Time
Time
Deviation
Manipulated value
Fig. 1.8 Proportional action for step response

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1.3.4 Integral action (I-action)
(1) The integral action is an action which continuously changes the manipulation value
to eliminate the deviation when there is an deviation.
The offset produced by the proportional action can be eliminated.
(2) In the integral action, the time from the deviation occurrence until the manipulation
value of the integral action becomes that of the proportional control action is called
the integral time, and is indicated by Ti.
(3) The integral action for the step response when the error value is constant is shown
in Figure 1.9.
(4) The integral action is used as a PI action in combination with the proportional
action, or PID action in combination with the proportional and derivative actions.
The integral action cannot be used alone.
E
Manipulated value of the Integral
action
Manipulated value of the Proportional
action + Integral action
TI
Deviation
Manipulated value
KP E
Time
Time
Manipulated value of the Proportional
action
Fig. 1.9 Integral action for step response