Mitsubishi MELSEC QJ71C24-R2 User manual

MELSEC System Q
Programmable Logic Controllers
User's Manual
(Basic)
Serial Communication Modules
QJ71C24N/-R2/-R4, QJ71C24/-R2
GX Configurator-SC
INDUSTRIAL AUTOMATION
MIT
SU
BI
S
HI ELE
C
TRI
C
MIT
SU
BI
S
HI ELE
C
TRI
C
Art. no.: 130031
01 09 2004
SH (NA)-080006
Version H

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 user's manual of the CPU module to use.
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 Instructions]
!DANGER
•See manuals of each data link for the operating status of each station when there is a
communication error in the data link.
There is the risk of an accident occurring due to output error or malfunctioning.
•When using the notification function, the pager receiver may not be contacted due to the frequency
transmission status from the system setup environment and error on the receiver side.
To ensure the safety of the PLC system, install a call circuit with a lamp display or buzzer sound.
•When performing the control of the PLC in operation (changing data) by connecting a peripheral
devices to the CPU module or personal computer, etc. to the intelligent device module, configure an
interlock circuit in a sequence program so the safety of the overall system is always maintained.
Also when performing other controls of the PLC in operation (changing program and operation
status (status control)), read this manual carefully and confirm if the overall safety is maintained.
Especially, when this control is performed to a remote PLC from an external device, troubles
that have occurred on the PLC side may not be able to immediately be handled if there is a data
communication error.
Define a troubleshooting agreement between external devices and the PLC CPU for data
communication error occurrences, as well as construct an interlock circuit in the sequence program.
•Do not write data into the "system area" of the buffer memory of intelligent function modules.
Also, do not use any "prohibited to use" signals as an output signal to an intelligent function
module from the PLC CPU.
Writing data into the "system area" or outputting a signal for "prohibited to use" may cause a
PLC system malfunction.

A - 2 A - 2
[Design Instructions]
!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 100mm(3.9inch) or more from each other.
Not doing so could result in noise that may cause malfunction.
•When using the module while values, such as buffer memory set values, are registered in the
Flash ROM, do not turn off the power supply for the module loading station nor reset the PLC
CPU.
If the power supply for the module loading station is turned off or the PLC CPU is reset while any
values are registered, the data contents in the Flash ROM become inconsistent and as a result the
values must be set again in the buffer memory, etc. and reregistered to the Flash ROM.
Also, this may cause failure and malfunction of the module.
[Installation Instructions]
!CAUTION
•Use the PLC in an environment that meets the general specifications contained in the user's
manual of the CPU module to use.
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.
•While pressing the installation lever located at the bottom of module, insert the module fixing tab
into the fixing hole in the base unit until it stops. Then, securely mount the module with the fixing
hole as a supporting point.
If the module is not installed properly, it may cause the module to malfunction, fail or fall off.
Secure the module with screws especially when it is used in an environment where constant
vibrations may occur.
•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 doing so may cause damage to the module.
•Do not directly touch the conductive area or electronic components of the module.
Doing so may cause malfunction or failure in the module.

A - 3 A - 3
[Wiring Instructions]
!CAUTION
•When turning on the power and operating the module after installation and wiring are completed,
always attach the terminal cover that comes with the product.
There is a risk of electric shock if the terminal cover is not attached.
•Perform correct pressure-displacement, crimp-contact or soldering for external wire connections
using the tools specified by the manufactures.
Incorrect connection may cause short circuits, fire, or malfunction.
•Attach connectors to the module securely.
•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.
•Before connecting the cables, check the type o f interface to be connected.
Connecting or erroneous wiring to the wrong interface may cause failure to the module and
external devices.
•Tighten the terminal screws within the range of specified torque.
If the terminal screws are loose, it may result in 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.
•When removing the communication cable or power supply cable from the module, do not pull the
cable. When removing the cable with a connector, hold the connector on the side that is
connected to the module.
When removing the cable connected to the terminal block, first loosen the screws on the part
that is connected to the terminal block.
Pulling the cable that is still connected to the module may cause malfunction or damage to the
module or cable.
•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.

A - 4 A - 4
[Startup/Maintenance Instructions]
!CAUTION
•Do not disassemble or modify each 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.
•Do not mount/remove the module onto/from base unit more than 50 times (IEC61131-2-
compliant), after the first use of the product.
Failure to do so may cause the module to malfunction due to poor contact of connector.
•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 terminal screws
and module installing 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.
[Operation Instructions]
!CAUTION
•When performing the control of the PLC in operation (especially changing data, program, and
operation status (status control)) by connecting a personal computer, etc. to the intelligent
function module, read this manual carefully and confirm if the overall safety is maintained.
Failure to perform correct operation s to change data, program, or the status may result in
system malfunction, machine damage, or an accident.
[Disposal Instructions]
!CAUTION
•When disposing of this product, treat it as industrial waste.

A - 5 A - 5
REVISIONS The manual number is given on the bottom left of the back cover.
Print Date Manual Number Revision
Dec., 1999 SH (NA)-080006-A First Printing
Oct., 2000 SH (NA)-080006-B Add the contents of the function version B.
Correction
Contents, Entire manual (change MELSECNET/10H to MELSECNET/H),
About Manuals, About The Generic Terms and Abbreviations, Product
Configuration, Section 1.2, 1.2(8), 1.3 POINT, Section 2.2, 2.3, 2.5, 2.6,
Section 3.1, 3.6, 3.9, Section 4.2, 4.4.1(2)(a)(Figure), 4.6(1), Chapter
5(all), Section 6.1.1, 6.1.3, 6.1.4, Section 7.1.1, 7.1.2, 7.2.2, Section 8.1,
8.2.1, 8.2.2, 8.3.1, 8.3.2, Section 9.2 to 9.7, Section 10.1.1, 10.2.1,
10.3.8, 10.3.18, Appendix 1.1(2), Appendix 2(all), appendix 3(2),
Appendix 7, appendix 8
Addition
Entire manual (add the explanation on MELSECNET/H remote I/O
station), The Manual's Use and Structure, Section 2.1, Section
3.1(Table), Section 4.4.2(1)(d), 4.9.2, Section 8.3.2 POINT, Section
10.2.1 (7164H, 7E70H), Appendix 3(1)
Jun., 2001 SH (NA)-080006-C Put Windows®base software product together from Mitsubishi
Programmable Logic Controller MELSEC Series to Mitsubishi integrated
FA Software MELSOFT Series.
Standardize the name from software package (GPP function) to Product
name (GX Developer).
Standardize the name from utility package (QSCU) to Product name (GX
Congifurator-SC).
Correction
Conformation to the EMC Directive and Low Voltage Instruction, About
the Generic Terms and Abbreviations, Product Configuration, Program
Examples (Section 6.1.4, 6.2.3, Section 7.2.3, Section 9.3, 9.5, Appendix-
8), Section 1.2(1)(d), 1.2(4)(b)(Diagram), 1.2(8)(b), 1.3, Section 2.1, 2.3,
2.4, 2.5, 2.7, Section 3.1(Table), 3.2.1(3), 3.3.3(2), 3.4(Table), 3.9,
Section 4.3, 4.5.2, Section 5.1.5(3), 5.2, Section 6.1.4, Section 8.2, 8.3.2
POINT, 8.4.2, 8.4.9(Table), 8.6.3(Table), 8.6.7(Table), Section 10.1.2(b),
10.3(Table), Appendix 1.1, 2.1, 6, 7, 9
Addition
Section 2.6, Section 8.4.4, 8.6.2(Table), Section 10.2.1(716FH, 7FEFH),
10.2.3(7FE9H), 10.3.14, Appendix 3
Feb., 2002 SH (NA)-080006-D Addition
About The Generic Terms and Abbreviations, Section 1.2, Section 2.1,
2.7, Section 4.5.2, Section 8.2.1, 8.2.2, Section 10.2.1, Appendix 1.1, 6
Oct., 2002 SH (NA)-080006-E Addition
The Manual’s Use and Structure, About The Generic Terms and
Abbreviations, Section 1.2(1)(4), Section 2.1, 2.4, Section 5.2, Section
6.1.4, Section 9.8, Appendix 7
Jan., 2003 SH (NA)-080006-F Addition model
QJ71C24N, QJ71C24N-R2, QJ71C24N-R4

A - 6 A - 6
The manual number is given on the bottom left of the back cover.
Print Date Manual Number Revision
Jan., 2003 SH (NA)-080006-F Addition
SAFETY PRECAUTIONS, About Manuals, About The Generic Terms
and Abbreviations, Product Configuration, Section 1.3, Section 2.1, 2.2,
2.3, 2.5, 2.6, 2.7, Section 3.1, 3.2.1, 3.3.1, 3.6, 3.8, 3.9, Section 4.1, 4.3,
4.4, 4.5, 4.6, 4.7.1, Section 6.1.1, 6.1.2, Section 7.1, 7.2.2, Chapter 8(all),
Section 9.1, 9.6, Section 10.1.2(b), 10.1.3(1), 10.2, Appendix 1, Appendix
2.1, Appendix 3, Appendix 5, Appendix 9
Jun., 2004 SH (NA)-080006-G Correction
About The Generic Terms and Abbreviations, Product Configuration,
Chapter 2 (all), Section 3.8, Section 4.2.2 (1), Section 5.1.3 POINT,
Section 5.1.4, Chapter 8 (screen change), Section 8.6.10, Section 10.1.1,
Section 10.2
Addition
Appendix 9
Sep., 2004 SH (NA)-080006-H Correction
Section 1.3, Section 2.5, 2.6, Section 3.5, 3.6, 3.9, Section 4.1, Chapter 8
(screen change), Section 8.6.9, 8.6.10, Section 10.1, 10.2, Appendix 1.1
Addition
Appendix 9.12
Japanese Manual Version SH-080001-L
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.
1999 MITSUBISHI ELECTRIC CORPORATION

A - 7 A - 7
INTRODUCTION
Thank you for 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.
Please forward a copy of this manual to the end user.
CONTENTS (This manual)
SAFETY PRECAUTIONS..............................................................................................................................A- 1
REVISIONS....................................................................................................................................................A- 5
CONTENTS....................................................................................................................................................A- 7
About Manuals ...............................................................................................................................................A-15
Conformation to the EMC Directive and Low Voltage Instruction................................................................A-15
The Manual’s Use and Structure...................................................................................................................A-16
About The Generic Terms and Abbreviations...............................................................................................A-19
Definitions and Descriptions of Terminology.................................................................................................A-21
Product Configuration ....................................................................................................................................A-23
1 OVERVIEW 1- 1 to 1-11
1.1 Overview of the Serial Communication Module.....................................................................................1- 1
1.2 Features of the Serial Communication Module......................................................................................1- 2
1.3 About Added/Changed Functions in Function Version B......................................................................1-10
2 SYSTEM CONFIGURATION AND AVAILABLE FUNCTIONS 2- 1 to 2-14
2.1 Applicable Systems.................................................................................................................................2- 1
2.2 Combinations of PLC CPU and External Device, and Available Functions..........................................2- 3
2.3 For Use in Multiple CPU System............................................................................................................2- 6
2.4 For Use with Q00J/Q00/Q01CPU ..........................................................................................................2- 7
2.5 For Use at MELSECNET/H Remote I/O Station....................................................................................2- 8
2.6 Checking the Function Version, Serial No., and Software Version.......................................................2-12
3 SPECIFICATIONS 3- 1 to 3-31
3.1 Performance Specifications....................................................................................................................3- 1
3.2 RS-232 Interface Specification...............................................................................................................3- 3
3.2.1 RS-232 connector specifications.....................................................................................................3- 3
3.2.2 RS-232 cable specification ..............................................................................................................3- 5
3.3 RS-422/485 Interface Specifications......................................................................................................3- 6
3.3.1 RS-422/485 terminal block specifications .......................................................................................3- 6
3.3.2 RS-422/485 cable specifications .....................................................................................................3- 7
3.3.3 Precautions when transferring data using RS-422/485 circuit .......................................................3- 8
3.4 Serial Communication Module Function List..........................................................................................3-11
3.5 Dedicated Instruction List........................................................................................................................3-12
3.6 Utility Package (GX Configurator-SC) Function List..............................................................................3-13
3.7 List of GX Developer Setting Items for Serial Communication Modules...............................................3-14
3.8 List of Input/Output Signals for the PLC CPU........................................................................................3-15
3.9 List of Applications and Assignments of the Buffer Memory.................................................................3-17

A - 8 A - 8
4 SETTINGS AND PROCEDURES PRIOR TO OPERATION 4- 1 to 33
4.1 Handling Precautions..............................................................................................................................4- 1
4.2 Settings and Procedures Prior to Operation..........................................................................................4- 2
4.3 Part Names and Functions.....................................................................................................................4- 3
4.4 External Wiring........................................................................................................................................4- 5
4.4.1 Connecting the RS-232 interface (full-duplex communications) ....................................................4- 6
4.4.2 Connecting the RS-422/485 interface.............................................................................................4- 8
4.5 Settings for GX Developer......................................................................................................................4-12
4.5.1 I/O assignment settings....................................................................................................................4-12
4.5.2 Switch settings for I/O and intelligent functional module ................................................................4-13
4.5.3 The Intelligent function module interrupt pointer setting.................................................................4-20
4.6 Settings with the Utility Package (GX Configurator-SC)........................................................................4-22
4.7 Individual Station Test.............................................................................................................................4-25
4.7.1 ROM/RAM/switch tests....................................................................................................................4-25
4.7.2 Individual station loopback test........................................................................................................4-28
4.8 Loopback Test.........................................................................................................................................4-30
4.9 Maintenance and Inspection...................................................................................................................4-32
4.9.1 Maintenance and inspection............................................................................................................4-32
4.9.2 When mounting/dismounting the module........................................................................................4-33
5 DATA COMMUNICATION USING THE MELSEC COMMUNICATION PROTOCOL 5- 1 to 5- 6
5.1 Data Communication Functions .............................................................................................................5- 1
5.1.1 Accessing the PLC CPUs using the MC protocol...........................................................................5- 1
5.1.2 Message format and control procedure for data communication...................................................5- 2
5.1.3 PLC CPU setting for performing data communication....................................................................5- 2
5.1.4 Support of multiple CPU system or redundant system...................................................................5- 3
5.1.5 Support for the QCPU remote password function ..........................................................................5- 4
5.2 Utilizing the MX Component...................................................................................................................5- 6
6 DATA COMMUNICATION USING THE NON PROCEDURE PROTOCOL 6- 1 to 6-31
6.1 Data Reception from the External Device..............................................................................................6- 2
6.1.1 Receiving methods...........................................................................................................................6- 2
6.1.2 The receive area and the received data list ....................................................................................6- 6
6.1.3 Sequence program for data reception.............................................................................................6-11
6.1.4 Receive data clear............................................................................................................................6-14
6.1.5 How to detect reception errors.........................................................................................................6-17
6.1.6 Received data count and receive complete code settings .............................................................6-20
6.2 Sending Data to the External Device .....................................................................................................6-22
6.2.1 Transmission methods.....................................................................................................................6-22
6.2.2 Arrangement and contents of the transmission area and the transmission data...........................6-23
6.2.3 Sequence program for transmission data.......................................................................................6-25
6.2.4 How to detect transmission errors...................................................................................................6-28
6.3 Data Communications Precautions........................................................................................................6-30

A - 9 A - 9
7 DATA COMMUNICATION USING THE BIDIRECTIONAL PROTOCOL 7- 1 to 7-28
7.1 Data Reception from the External Device..............................................................................................7- 2
7.1.1 Receiving methods...........................................................................................................................7- 2
7.1.2 Arrangement and contents of the receive area and the receive data............................................7- 4
7.1.3 Sequence program for data reception.............................................................................................7-10
7.1.4 How to detect reception errors.........................................................................................................7-13
7.1.5 Receive data clear............................................................................................................................7-14
7.2 Sending Data to the External Device .....................................................................................................7-15
7.2.1 Transmission methods.....................................................................................................................7-15
7.2.2 Arrangement and contents of the transmission area and the transmission data...........................7-16
7.2.3 Sequence program for data transmission.......................................................................................7-19
7.2.4 How to detect transmission errors...................................................................................................7-22
7.3 Processing when Simultaneous Transmission Performed During Full-Duplex Communications .......7-24
7.3.1 Processing when simultaneous transmissions occur .....................................................................7-24
7.3.2 Communication data processing when simultaneous transmissions occur...................................7-25
7.4 Data Communications Precautions........................................................................................................7-27
8 UTILITY PACKAGE (GX CONFIGURATOR-SC) 8- 1 to 8-51
8.1 Functions Available with Utility Package................................................................................................8- 2
8.2 Installing and Uninstalling Utility Package..............................................................................................8- 3
8.2.1 Usage precautions...........................................................................................................................8- 3
8.2.2 Operating environment.....................................................................................................................8- 5
8.3 Explanation of Utility Package Operation...............................................................................................8- 6
8.3.1 Operation overview ..........................................................................................................................8- 6
8.3.2 Starting the intelligent function module utility
(displaying the [select parameter setting module] screen)........................................................................8-10
8.3.3 Performing common utility operations.............................................................................................8-13
8.4 System Registration to Flash ROM........................................................................................................8-16
8.4.1 User frame registration.....................................................................................................................8-18
8.4.2 Data for modem initialization registration........................................................................................8-19
8.4.3 Data for modem connection registration .........................................................................................8-20
8.4.4 Modem function system setting/registration....................................................................................8-21
8.4.5 Transmission control and others system setting.............................................................................8-22
8.4.6 MC protocol system setting..............................................................................................................8-24
8.4.7 Non procedure system setting.........................................................................................................8-25
8.4.8 Bidirectional system setting .............................................................................................................8-26
8.4.9 PLC CPU monitoring system setting...............................................................................................8-27
8.4.10 Transmission user frame No. designation system setting............................................................8-29
8.4.11 Resetting the buffer memory/flash ROM setting values to the default values.............................8-30
8.4.12 Flash ROM write allow/prohibit setting..........................................................................................8-30
8.5 Auto Refresh Setting...............................................................................................................................8-31
8.6 Monitor/Test ............................................................................................................................................8-32
8.6.1 X · Y monitor/test..............................................................................................................................8-33
8.6.2 Modem function monitor/test ...........................................................................................................8-34
8.6.3 Transmission control and others monitor/test.................................................................................8-37
8.6.4 MC protocol monitor.........................................................................................................................8-39

A - 10 A - 10
8.6.5 Non procedure monitor/test .............................................................................................................8-41
8.6.6 Bidirectional monitor.........................................................................................................................8-43
8.6.7 PLC CPU monitoring monitor ..........................................................................................................8-44
8.6.8 Transmission user frame No. designation monitor .........................................................................8-46
8.6.9 Monitor/test others............................................................................................................................8-47
8.6.10 Display LED off and communication error information/error code initialization...........................8-49
8.7 Non Procedure Protocol Receive Data Clear ........................................................................................8-51
9 DEDICATED INSTRUCTIONS 9- 1 to 9-21
9.1 Dedicated Instruction List........................................................................................................................9- 1
9.2 ONDEMAND Instruction.........................................................................................................................9- 2
9.3 OUTPUT Instruction................................................................................................................................9- 5
9.4 INPUT Instruction....................................................................................................................................9- 8
9.5 BIDOUT Instruction.................................................................................................................................9-11
9.6 BIDIN Instruction.....................................................................................................................................9-14
9.7 SPBUSY Instruction................................................................................................................................9-17
9.8 CSET (Receive data clear).....................................................................................................................9-19
10 TROUBLESHOOTING 10- 1 to 10-43
10.1 Checking the Status of the Serial Communication Module...............................................................10- 1
10.1.1 Checking the LED ON status, communications error status, and switch setting status of
the serial communication module................................................................................................10- 1
10.1.2 Initializing error information of the serial communication module...............................................10- 6
10.1.3 Reading the RS-232 control signal status...................................................................................10- 9
10.1.4 Reading the data communication status (Transmission sequence status) ...............................10-10
10.1.5 Reading the switch setting status................................................................................................10-11
10.1.6 How to read the current operation status....................................................................................10-13
10.2 Error Code Tables...............................................................................................................................10-15
10.2.1 Error code table............................................................................................................................10-15
10.2.2 A compatible 1C frame communications error code table..........................................................10-24
10.2.3 Error code list while modem function is used..............................................................................10-25
10.3 Troubleshooting by Symptom.............................................................................................................10-27
10.3.1 Troubleshooting when "RUN" LED is turned OFF......................................................................10-29
10.3.2 Troubleshooting when "RD" LED does not blink even though an external device is
transmitting a message................................................................................................................10-30
10.3.3 Troubleshooting when the Q series C24 does not return a response message even
though an external device transmitted a message and the "RD" LED blinked..........................10-31
10.3.4 Troubleshooting when an external device transmitted a message and "RD" LED blinked,
but the Read Request signal was not turned ON .......................................................................10-32
10.3.5 Troubleshooting when communication error "NAK" generates..................................................10-33
10.3.6 Troubleshooting when communication error "C/N" generates ...................................................10-33
10.3.7 Troubleshooting when communication error "P/S" generates....................................................10-34
10.3.8 Troubleshooting when communication error "PRO." generates.................................................10-35
10.3.9 Troubleshooting when communication error "SIO" generates ...................................................10-36
10.3.10 Troubleshooting when communication error "CH1 ERR.", "CH2 ERR." generate..................10-37
10.3.11 Troubleshooting when communications is intermittently established and lost ........................10-38
10.3.12 Troubleshooting when data that cannot be decoded is transmitted and received ..................10-39

A - 11 A - 11
10.3.13 Troubleshooting when it is unclear whether the communication error cause is in
the Q series C24 or an external device ....................................................................................10-40
10.3.14 Troubleshooting when data cannot be communicated via modem..........................................10-41
10.3.15 Troubleshooting when data cannot be communicated with the ISDN sub-address................10-42
10.3.16 Troubleshooting when constant cycle transmission does not operate normally......................10-42
10.3.17 Troubleshooting when condition agreement transmission does not operate normally...........10-42
10.3.18 Troubleshooting when data cannot be received by an interrupt program ...............................10-42
10.3.19 Troubleshooting when data cannot be written to Flash ROM..................................................10-42
10.3.20 Troubleshooting when the "ERR" LED is lit ..............................................................................10-43
APPENDIX APP.- 1 to APP.-58
Appendix 1 Functional Improvements of the Q Series C24 ...................................................................App.- 1
Appendix 1.1 Comparison of the Functions of Q Series C24/GX Configurator-SC...........................App.- 1
Appendix 1.2 Precautions when Updating the Module from Function Version A to B.......................App.- 5
Appendix 2 QnA/A Series Module...........................................................................................................App.- 6
Appendix 2.1 Functional Comparison with the Q series C24 and the QnA/A Series Modules .........App.- 6
Appendix 2.2 Using Programs Designed for the QC24 (N) and Installing the Q Series C24
into Existing Systems....................................................................................................App.- 8
Appendix 2.2.1 Using programs designed for the QC24 (N).....................................................App.- 8
Appendix 2.2.2 Installing on existing systems...........................................................................App.- 9
Appendix 2.3 Using Programs Designed for the Computer Link Module and Installing
the Q Series C24 into Existing Systems......................................................................APP.-10
Appendix 2.3.1 Using programs designed for the computer link module..................................App.-10
Appendix 2.3.2 Installing the Q series C24 into existing systems.............................................App.-13
Appendix 3 Processing Time...................................................................................................................App.-14
Appendix 4 ASCII-Code Table.................................................................................................................App.-17
Appendix 5 External Dimensions.............................................................................................................App.-18
Appendix 6 Example of Connection when a Converter is Used.............................................................App.-20
Appendix 7 Communication Support Tool (MX Component) .................................................................App.-23
Appendix 7.1 Overview of MX Component .........................................................................................App.-23
Appendix 7.2 Usage Procedure of MX Component............................................................................App.-26
Appendix 8 Example of Clear Process Program for Receive Data........................................................App.-30
Appendix 9 Program Examples for Using Q Series C24 at MELSECNET/H Remote I/O Station........App.-32
Appendix 9.1 System configuration and program conditions .............................................................App.-32
Appendix 9.2 When accessing buffer memory using sequence program..........................................App.-34
Appendix 9.3 When sending on-demand data....................................................................................App.-35
Appendix 9.4 When receiving data using nonprocedural or bidirectional protocol............................App.-37
Appendix 9.5 When sending data using nonprocedural or bidirectional protocol..............................App.-39
Appendix 9.6 When clearing received data.........................................................................................App.-41
Appendix 9.7 When sending data using user frames .........................................................................App.-43
Appendix 9.8 When performing initial setting......................................................................................App.-46
Appendix 9.9 When registering user frame.........................................................................................App.-48
Appendix 9.10 When reading user frame............................................................................................App.-50
Appendix 9.11 When deleting user frame...........................................................................................App.-52
Appendix 9.12 When changing the communication protocol and transmission setting.....................App.-54
Appendix 10 Setting Value Recording Sheet..........................................................................................App.-57
INDEX Index- 1 to Index- 2

A - 12 A - 12
(Related Manual-1) … Q Corresponding Serial Communication Module User's Manual (Application)
SH-080007-G
1 OVERVIEW
1.1 Overview
1.2 Functions Added/Changed by Function
Version B
2 USING THE PLC CPU MONITORING
FUNCTION
2.1 Overview
2.2 About the PLC CPU Monitoring Function
2.3 Settings for Using the PLC CPU Monitoring
Function
2.4 Precautionary Notes for Using the PLC CPU
Monitoring Function
3 COMMUNICATIONS BY THE MODEM
FUNCTION
3.1 Overview
3.2 System Configuration
3.3 Specifications
3.4 Start-up of the Modem Function
3.5 Sample Programs
4 RECEIVING DATA WITH AN INTERRUPT
PROGRAM
4.1 Settings for Receiving Data Using an Interrupt
Program
4.2 Interrupt Program Startup Timing
4.3 Reception Control Method Using an Interrupt
Program
4.4 Programming
5 CHANGING SEND AND RECEIVE DATA
LENGTH UNITS TO BYTE UNITS
(WORD/BYTES UNITS SETTING)
6 CHANGING THE DATA COMMUNICATIONS
MONITORING TIMES
6.1 No-Reception Monitoring Time (timer 0)
Setting
6.2 Response Monitoring Time (timer 1) Setting
6.3 Transmission Monitoring Time (timer 2)
Setting
6.4 Message Wait Time Setting
7 DATA COMMUNICATIONS USING DC CODE
TRANSMISSION CONTROL
7.1 Control Contents of DTR/DSR (ER/DR)
Signal Control
7.2 Control Contents of DC Code Control
7.3 Precautions when Using the Transmission
Control Functions
8 DATA COMMUNICATIONS USING HALF-
DUPLEX COMMUNICATIONS
8.1 Half-duplex Communications
8.2 Data Transmission and Reception Timing
8.3 Changing the Communication System
8.4 Connector Connections for Half-duplex
Communications
8.5 Half-duplex Communications Precautions
9 CONTENTS AND REGISTRATION OF THE
USER FRAMES FOR DATA COMMUNICATION
9.1 User Frame Types and Contents During
Communication
9.2 Transmission/Reception Processing Using
User Frame Register Data
9.3 Precautions when Registering, Reading,
Deleting and Using User Frames
9.4 Register/Read/Delete User Frames
10 ON-DEMAND DATA COMMUNICATIONS
USING USER FRAMES
10.1 User Frame Data Communications Function
10.2 User Frame Types and Registration
10.3 User Frame On-Demand Data Transmission
and Buffer Memory Used
10.4 On-Demand Function Control Procedure
During User Frame Use
10.5 Example of an On-Demand Data
Transmission Program Using User Frames
11 DATA COMMUNICATIONS USING USER
FRAMES
11.1 Overview of Data Communication
Procedure
11.2 Data Reception
11.3 Receive Program
11.4 Data Transmission
11.5 Transmission program
12 TRANSPARENT CODES AND ADDITIONAL
CODES
12.1 Handling the Transparent Code and
Additional Code Data
12.2 Registering Transparent Codes and
Additional Codes
12.3 Handling Transparent Codes and Additional
Codes During Non Procedure Protocol Data
Communication
12.4 Example of Data Communication Using the
Non Procedure Protocol
12.5 Handling Transparent Codes and Additional
Codes During Bidirectional Protocol Data
Communication
12.6 Example of Data Communication Using the
Bidirectional Protocol

A - 13 A - 13
(Related Manual-1) … Q Corresponding Serial Communication Module User's Manual (Application)
SH-080007-G
13 COMMUNICATING WITH ASCII CODE (ASCII-
BIN CONVERSION)
13.1 ASCII-BIN Conversion
13.2 Settings for ASCII-BIN Conversion
13.3 Performing ASCII-BIN Conversion for Data
Communicated via Non Procedure Protocol
13.4 Example of Data Communication Using the
Non Procedure Protocol
13.5 Performing ASCII-BIN Conversion for Data
Communicated Via the Bidirectional Protocol
13.6 Example of Data Communication Using the
Bidirectional Protocol
14 DATA COMMUNICATIONS USING EXTERNAL
DEVICE AND PLC CPU M : N
CONFIGURATION
14.1 Data Communications Precautions
14.2 External Devices Interlock Conditions
14.3 Examples of Procedure for Data
Communications with the PLC CPU
15 SWITCHING THE MODE AFTER STARTING
15.1 Mode Switching Operation and Contents
that can be Changed
15.2 Mode Switching Precautions
15.3 I/O Signals for Handshake with PLC CPU
and Buffer Memory
15.4 Switching the Mode from the PLC CPU
15.5 Switching the Mode from an External Device
16 USING COMMUNICATION DATA
MONITORING FUNCTION
16.1 Communication Data Monitoring Function
16.2 Communication Data Monitoring Function
Settings
16.3 Communication Data Monitoring Example
17 DEDICATED INSTRUCTIONS
17.1 Dedicated Instruction List
17.2 BUFRCVS Instruction
17.3 CSET Instruction (PLC CPU Monitoring
Register/Cancel)
17.4 CSET Instruction (Initial Settings)
17.5 GETE Instruction
17.6 PRR Instruction
17.7 PUTE Instruction
17.8 UINI Instruction

A - 14 A - 14
(Related Manual-2) … Q Corresponding MELSEC Communication Protocol Reference Manual SH-080008-F
1 OVERVIEW
1.1 Overview of the MELSEC Communication
Protocol
1.2 Features of the MELSEC Communication
Protocol
2 DATA COMMUNICATION USING THE MELSEC
COMMUNICATION PROTOCOL
2.1 Types and Applications of Data
Communication Frames
2.2 Accessible Range of Each Data
Communication Frames
2.3 How to Read the Control Procedures of the
MC Protocol
2.4 Access Timing of the PLC CPU Side
2.5 Setting Method for Writing to the PLC CPU
during RUN
2.6 Accessing Other Stations
2.7 Precautions on Data Communication
2.8 Time Chart and Communication Time of the
Transmission Sequence of the Serial
Communication Module
2.9 Transmission Time When Accessing Other
Stations Via MELSECNET/H, MELSECNET/10
2.10 Compatibility with Multiple CPU Systems
2.11 Compatibility with the Q00CPU, Q01CPU
Serial Communication Function
3 WHEN COMMUNICATING USING THE QnA
COMPATIBLE 3E/3C/4C FRAMES
3.1 Message Formats
3.2 List of Commands and Functions for the QnA
Compatible 3E/3C/4C Frames
3.3 Device Memory Read/Write
3.4 Buffer Memory Read/Write
3.5 Reading from and Writing to the Buffer
Memory of an Intelligent Function Module
3.6 PLC CPU Status Control
3.7 Drive Memory Defragmentation (for Other
Station QnACPU)
3.8 File Control
3.9 Registering, Deleting and Reading User
Frames: for Serial Communication Modules
3.10 Global Function: for Serial Communication
Modules
3.11 Data Transmission to an External device
(On-Demand Function): for Serial
Communication Modules
3.12 Initializing the Transmission Sequence: for
Serial Communication Modules
3.13 Mode Switching: for Serial Communication
Module
3.14 Turning Off Displayed LEDs and Initializing
Communication Error Information and Error
Code: for Serial Communication Module
3.15 Turning Off the COM.ERR LED: for Ethernet
Modules
3.16 Loopback Test
3.17 Registering or Canceling PLC CPU
Monitoring: for Serial Communication
Modules
3.18 Remote Password Unlock/Lock
4 WHEN COMMUNICATING USING THE QnA
COMPATIBLE 2C FRAMES
4.1 Control Procedures and Message Formats
4.2 Contents of the Data Designation Items
4.3 List of Commands and Functions for QnA
Compatible 2C Frames
4.4 Precautions on the Data Communication
4.5 Example of Data Communication Using QnA
Compatible 2C Frames
5 WHEN COMMUNICATING USING THE A
COMPATIBLE 1C FRAMES
5.1 Control Procedures and Message Formats
5.2 Device Memory Read/Write
5.3 Extension File Register Read and Write
5.4 Reading and Writing in the Buffer Memory of
an Intelligent Function Module
5.5 Loopback Test
6 WHEN COMMUNICATING USING THE A
COMPATIBLE 1E FRAMES
6.1 Message Formats and Control Procedures
6.2 List of Commands and Functions for A
Compatible 1E Frames
6.3 Device Memory Read/Write
6.4 Extension File Register Read and Write
6.5 Reading and Writing in the Buffer Memory of
an Intelligent Function Module
APPENDIX
Appendix-1 Reading and Writing by Designation
of the Device Memory Extension
Appendix 2 Reading from and Writing to the
Buffer Memory
Appendix-3 Processing Time of the PLC CPU
Side While Communicating Using
the MC Protocol

A - 15 A - 15
About Manuals
The following table lists the manuals relating to this product. Please order the desired manual(s) as needed.
Related manuals
Manual Name Manual Number
(Model Code)
Q Corresponding Serial Communication Module User's Manual (Application)
This manual explains the specifications and operating procedures for the special module functions, the
settings for use of special functions, and data-communication method for use with external devices.
(sold separately)
SH-080007
(13JL87)
Q Corresponding MELSEC Communication Protocol Reference Manual
This manual explains how the external devices read and write PLC CPU data through communication
with the MC protocol using the serial communication module/Ethernet module.
(sold separately)
SH-080008
(13JF89)
GX Configurator-SC Version 2 Operating Manual (Protocol FB support function)
This manual explains the function and usage of the protocol FB support function that supports the
creation of the data communication program of the module and set up of each parameter.
(sold separately)
SH-080393E
(13JU46)
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 CPU module 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.
By making this product conform to the EMC directive and low voltage instruction, it is
not necessary to make those steps individually.

A - 16 A - 16
The Manual's Use and Structure
How to use this manual
In this manual, details of the serial communication modules (QJ71C24N,
QJ71C24N-R2, QJ71C24N-R4, QJ71C24 and QJ71C24-R2) are organized as
shown below, according to their applications.
Please use this manual using the contents below as a reference.
(1) To learn about features, functions and component parts
(a) To learn about features and functions
• Chapter 1 describes the features of the serial communication modules.
• Chapter 3 describes the common specifications and functions of the serial
communication modules.
(b) To learn about the packed items and system-configured items
• The section prior to Chapter 1, "Product Configuration", describes the
parts that are packed along with the serial communication module.
• Parts and components other than those packed with the module must be
prepared separately by the user.
(2) To learn about processing required to start up the serial
communication module
(a) To learn about the startup procedure
• Section 4.2 describes the general procedures prior to starting the
operation of the serial communication module.
(b) To learn about the connection with the external devices
• Section 4.4 describes the connection methods for each type of interface.
(c) To learn about processing required prior to operation of the serial
communication module
• Section 4.5 explains the parameter settings with GX Developer in order to
use the serial communication module.
• Section 4.6 and Chapter 8 describe the settings from GX Configurator-SC
to perform the initial setting of the serial communication module.
To change an initial value, follow the procedure described in Chapter 8.
(d) To check for failure in the serial communication module
• Section 4.7 describes the test of the individual serial communication
module.
(e) To learn how to check for a connection error with the external devices
• Section 4.8 describes how to perform the individual module test and the
loopback test using MC protocol-based communication.
Details of the loopback test command are described in the reference
manual.

A - 17 A - 17
(3) To learn about data communication functions and detailed
explanations
(a) To learn about the communication functions
• Section 3.4 describes an overview of the serial communication module
functions.
(b) To learn about detailed explanations of the communication functions
• The basic communication methods are described in Chapters 5 to 7.
• Special functions are described in the User's Manual (Application).
(4) To learn about data communication functions and programming
(a) To learn how to read data from and written to the PLC CPU
• Data is read from and written to the PLC CPU with a communication
function using the MC protocol.
Details are described in the Reference Manual.
• Appendix 7 describes an overview of the communication support tool (MX
Component) that supports communication using the MC protocol.
(b) To learn how to send and receive data between the PLC CPU and the
external devices
• Data communication between the PLC CPU and the external devices is
performed with a communication function using the non procedure
protocol or the bidirectional protocol.
• Chapter 6 explains details of the communication functions and
programming using the non procedure protocol.
• Chapter 7 explains details of the communication functions and
programming using the bidirectional protocol.
(5) To learn how to check for error occurrences and take corrective
actions
Chapter 10 describes troubleshooting, how to check for errors, and detailed
explanations of error codes.
(6) To learn about functions that have been added or changed in
function version B
• Section 1.3 lists the functions that have been added or changed as well as
manuals that provide detailed explanations hereof.
• Appendix 1.1 provides a breakdown of the functions of Q series C24/GX
Configurator-SC by function version/software version.

A - 18 A - 18
The structure of this manual
The module's buffer memory stores default values that are used as initial settings
to execute the data send/receive functions in order to communicate with the
external devices.
Data can be sent to or received from the external devices using these default
values. However, it may be necessary to change the default values, depending on
system specifications.
This manual explains how to perform the initial settings in order to use each
function of the utility package available for this module (GX-Configurator-SC).
When changing a default value for sending and receiving data to/from an opposite
device, first see the section describing the applicable function to verify the initial
setting item and setting value you wish to change, then change the default value
as explained in Chapter 8.