Sh3511m

• SAFETY PRECAUTIONS •
(Read these precautions before using.)

When using Mitsubishi equipment, thoroughly read this manual and the associated manuals introduced in
this manual. Also pay careful attention to safety and handle the module properly.
These precautions apply only to Mitsubishi equipment. Refer to the CPU module user's manual used for a
description of the PC system safety precautions.
These SAFETY PRECAUTIONS classify the safety precautions into two categories: "DANGER" and
"CAUTION".

Procedures which may lead to a dangerous condition and cause death or serious
DANGER
injury if not carried out properly.
Procedures which may lead to a dangerous condition and cause superficial to
CAUTION
medium injury, or physical damage only, if not carried out properly.

Depending on circumstances, procedures indicated by CAUTION may also be linked to serious results.
In any case, it is important to follow the directions for usage.
Store this manual in a safe place so that you can read it whenever necessary.
Always forward it to the end user.

[System Design Precautions]

DANGER

• When controlling a PC by connecting a personal computer or other similar control device to a special
function module for the purpose of changing the data, changing the program, or changing the operation
status (Remote RUN/STOP), an interlock circuit must be configured in the sequence program so that the
entire system will always operate safely.
If a remote PC is controlled in the manner indicated above by an external device, the system may fail to
respond immediately even when trouble occurs at the remote PC due to data communication error.
In addition to configuring the interlock circuit in a sequence program, determine the response to be
taken by the system at the occurrence of a data communication error as the processing between the
external device and the PC CPU.

CAUTION

• Do not bundle control lines or communication wires together with main circuit or power lines, or lay them
close to these lines.
As a guide, separate these lines by a distance of at least 100 mm, otherwise malfunctions may occur
due to noise.

[Cautions on Mounting]

CAUTION

• Use the PC in the environment given in the general specifications section of the applicable User's
Manual for the CPU module used.
Using this programmable controller in an environment outside the range of the general specifications
could result in electric shock, fire, malfunction, and damage to or deterioration of the product.

• Shut off the external power supply for the system in all phases before wiring.
If all phases are not switched off, there will be a danger of electric shock or damage to the product.

• Make sure that the module fixing projection on the base of the module is properly engaged in the
module fixing hole in the base unit before mounting the module.(AnS series modules must be screwed
to the base unit with the specified torque.)
Failure to mount the module properly will result in malfunction or failure, or in the module falling.

• Tighten screws to the specified torque.
If a screw is not tightened to the specified torque, the module may fall out, or a short circuit or
malfunction may occur.
If a screw is tightened excessively, exceeding the specified torque, the module may fall out, short circuit,
or malfunction due to breakage of the screw or the module.

• Do not touch conductive parts or electronic components of the module with your bare hands.
This could cause malfunction or failure of the module.

[Cautions on Wiring]

CAUTION

• Communication cables connected to a module must always be run in a duct or held securely using
clamps.
If a cable is not run in a duct or not held securely using clamps, the cable will sag, move, or be pulled by
mistake, which will cause damage to the module and the cable and also malfunctioning due to loose
connection of the cable.

• When connecting a wire to a connector, use the specified tool to connect it by crimping, pressure
welding, or soldering correctly. Plug the connector into the module securely.

• Check the correct type of interface for the connection before connecting cables.
Connecting a cable to the wrong interface or miswiring could cause failure of the module or external
device.

• Do not connect an external device that requires power supply from the computer link module to the RS-
422 interface of the computer link module.
This could cause failure of the module or the external device.

• Tighten terminal screws to the specified torque.
If a terminal screw is not tightened to the specified torque, it the module may fall out, short circuit, or
malfunction.
If a terminal screw is tightened excessively, exceeding the specified torque, the module may fall out,
short circuit, or malfunction due to breakage of the screw or the module.

• When removing the communication cable from a module, do not pull it out by the cable.
For a cable with a connector, hold the connector plugged into the module to disconnect the cable.
For a cable without a connector, loosen the screws that hold the cable onto the module then remove the
cable.
If the cable is pulled while it is connected to the module, the module and/or the cable will be damaged
and may malfunction due to loose connection of the cable.

• Make sure that no foreign matter such as chips or wire offcuts gets inside the module.
It will cause fire, failure, or malfunction.

[Cautions on Startup and Maintenance]

DANGER

• Do not touch terminals while the power is ON.
This will cause malfunctions.

• Always switch OFF the external supply power used by the system in all phases before cleaning or
retightening screws. If all phases are not switched off, the module may fail or malfunction.
If a screw is not tightened securely, the module may fall out, short circuit, or malfunction.
If a screw is tightened excessively, the module may fall out, short circuit, or malfunction due to breakage
of the screw or the module.

CAUTION

• Do not disassemble or modify any module.
This will cause failure, malfunction, injuries, or fire.

• Shut off the external power supply for the system in all phases before mounting or removing the module.
If all phases are not switched off, the module may fail or malfunction.

• Before handling the module, touch a grounded metal object to discharge the static electricity from the
human body.
Not doing so may cause a failure or malfunction of the module.
[Cautions on Operation]

DANGER

• Do not write data in the "system area" in the buffer memory of a special function module.
Among the signals output from the PC CPU to a special function module, do not output the "usage
prohibited" signals.
Writing data in the "system area" or outputting the "usage prohibited" signals will cause malfunctions of
the PC system.

CAUTION

• When controlling a PC by connecting a personal computer or other similar control device to a special
function module for the purpose of changing the data, changing a program, or changing the operation
status (Remote RUN/STOP), read this manual carefully and start the intended control only after
ensuring that it can be performed safely.
Errors in changing the data, changing the program, or controlling the status will cause system
malfunction, and machine damage or accidents.

• When using the contents of buffer memory by registering them to the EEPROM in a module, do not
switch off the power of the station where the module is mounted, or reset the PC CPU.
If the power is switched off at the station where the module is mounted or the PC CPU is reset, the
contents of the data in the EEPROM will become indefinite, requiring the data to be registered to the
EEPROM again. The module may also fail or malfunction.

[Cautions on Disposal]

CAUTION

• Dispose of this product as industrial waste.

REVISIONS
*The manual number is given on the bottom left of the back cover.
Print Date *Manual Number Revision
Sep., 1994 SH (NA)-3511-A First edition
Feb., 1995 SH (NA)-3511-B Correction
Front cover(applicable module model names added), Sections
3.2.1(Page 3-7, 3-9 position of *3 changed), 3.10(Table 3.13),
6.2.1(4) (How to clear received data), 7.2.6 (2) (k)
Addition
Sections 6.2.1 (4) REMARK , 6.2.5 (7)
Feb., 1995 SH (NA)-3511-C Correction
Sections 5.5 (4) (b), APPENDIX 4.2 (1)
Feb., 1995 SH (NA)-3511-D Correction
Front cover(applicable module model names added), Section 1.4.1,
Chapter 2, Sections 3.9, 5.12.3, 6.4.2, 15.4
Addition
Related Manuals,
Sections 1.3.1, 1.4.2, 3.7.1, 3.10, 4.1.2, 4.2.1, 4.2.2, 4.3, 4.7, 6.2.1,
6.2.4, Chapter 14, Sections 15.2, 16.2, 16.3, 16.6, 16.7.2, 17.8,
18.3.2, 18.3.3, 18.3.4
Mar., 1996 SH (NA)-3511-E Correction
Sections 2.7 (2), 4.6.2 (1)
Jan., 1998 SH (NA)-3511-F Correction
SAFETY PRECAUTIONS, CONTENTS (APPENDIX),
Sections 1.4.2 (2), 2.7, 3.1 (Table 3.1), 3.2.1 (Table 3.2, *1),
(2) POINT, 5.7.1 (1)-(a), (2)-(b) POINT, 6.4.2 (2) POINT, 7.2.7 (5),
7.4.2, APPENDIX 6 (Section numbers changed due to addition of
APPENDIX 5)
Addition
Sections 2.7 (3), 5.2.4 (9), APPENDIX 5
May., 1998 SH (NA)-3511-G Correction
SAFTEY PRECAUTIONS, Sections 1.4.2, 2.7, 3.2.1, 3.7.1 (3), 3.9,
3.10, 4.6.1, 4.7, 5.7.1, 5.10 (3), 6.2.1 (4), 6.2.4, 7.6.2, 8.3.1, 8.3.2,
12.4.2, 12.5.2, 17.8 (5), APPENDIX 3, 6.1.1 (1)
Addition
SAFTEY PRECAUTIONS, Sections 1.3.1, 4.6.2, 4.6.3, 5.11.3,
5.12.5 (1) 17.2.4, APPENDIX 3, 5, 6.1.3, 7
Deletion
Sections 4.6.3, APPENDIX 3

Print Date *Manual Number Revision
Jun, 1998 SH (NA)-3511-H Correction
SAFETY PRECAUTIONS, Sections 2.7 (3), 6.2.4 (2)-(a), (2)-(e),
6.2.5 to 6.5.2 (page No.)
Addition
Sections 6.2.4 (4), 6.2.5 (8)
Jan., 1999 SH (NA)-3511-I Correction
CONTENTS (APPENDIX 7 changed to APPENDIX 8),
Sections 2.7 (3), 3.1, 3.8.1 (2) (Figure), 3.8.3 (Figure), 4.2.1 (Table),
4.2.2 (d), 4.6.3 (2) (Wiring Diagram), APPENDIX 5 (3),
APPENDIX 8 (Section)
Addition
CONTENTS (APPENDIX 7), Sections 1.1.1 (2) POINT,
*5 *6
3.2.1 (1) , 3.10 (2) POINT, 13.4.1 (Remark), APPENDIX 7
Jan., 2000 SH (NA)-3511-J Correction
SAFETY PRECAUTIONS, Sections 2.6.2, 2.7 (1), 3.2.1, 3.8.3 (1) 2)
(4), 4.6.3 (1) (e), 5.2.4 (2), 5.14.3 (3), 7.2.7 (3), APPENDIX 3, 5
Addition
Sections 4.6.3 (1) (g), 5.2.4 (10)
Jan., 2001 SH (NA)-3511-K Correction
Sections 1.1.1 (2) POINT, 2.7 (1) (3), 3.2.1 (2), 3.6, 4.2.1,
4.5.1 (Step 3), 5.2.3 (2) *1, 5.5, 12.1, 12.2.1 (2),
APPENDIX 3 (2), APPENDIX 7
Addition
Sections 5.5 (4) (b) 2), APPENDIX 3 (2) *3
Dec., 2003 SH (NA)-3511-L Correction
SAFETY PRECAUTIONS, Sections 1.1.1, 1.1.2, 3.1, 5.7.1, 5.11.3,
6.2.1, 12.3, 12.4.1, 16.7.2, 18.1, APPENDIX 7, 7.1, 7.2
Addition
Conformation to the EMC Directive and Low Voltage Instruction
Feb., 2009 SH (NA)-3511-M Correction
SAFETY PRECAUTIONS, Chapter 1, Sections 3.8.2, 3.8.3 (4),
4.2.2 (2) (3), 8.3.2, 9.2.1, APPENDIX 7.1 (3) to (5), 8 (3)
Addition
Sections 4.2.2 (5) 8)

Japanese Manual Version SH-3495-M

CONTENTS

COMMON

1. GENERAL DESCRIPTION.....................................................................................................1 – 1 ~ 1 – 14

1.1 General Description of Computer Link Functions.......................................................................1 – 1
1.1.1 General description and features of computer link
in the dedicated protocol................................................................................................1 – 2
in the no-protocol mode .................................................................................................1 – 4
in the bidirectional mode................................................................................................1 – 6
1.2 General Description of Printer Function......................................................................................1 – 8
1.3 General Description and Functions of Computer Link Module ................................................ 1 – 10
1.3.1 General description and functions ...............................................................................1 – 10
1.3.2 How to confirm the version of computer link module................................................... 1 – 11
1.4 Configuration of This Manual and Abbreviation........................................................................1 – 12
1.4.1 Configuration of this manual ........................................................................................1 – 12
1.4.2 Abbreviation and general name used in this manual...................................................1 – 13

COMPUTER LINK FUNCTION

2. SYSTEM CONFIGURATION AND AVAILABLE FUNCTIONS..............................................2 – 1 ~ 2 – 22

2.1 1 : 1 Ratio of an External Device to a PC CPU ..........................................................................2 – 3
2.2 1 : n Ratio of an External Device to PC CPUs............................................................................2 – 6
2.3 2 : 1 Ratio of External Devices to a PC CPU..............................................................................2 – 9
2.4 2 : n Ratio of External Devices to PC CPUs.............................................................................2 – 12
2.5 m : n Ratio of External Devices to PC CPUs............................................................................2 – 15
2.6 System Configuration For Data Link System and Network System ........................................ 2 – 18
2.6.1 In the case of MELSECNET(II) and MELSECNET/B ..................................................2 – 18
2.6.2 In the case of MELSECNET/10 ...................................................................................2 – 19
2.7 Applicable PC CPU Modules and Number of Computer Link Modules....................................2 – 21

3. SPECIFICATIONS ..................................................................................................................3 – 1 ~ 3 – 42

3.1 Transmission Specifications........................................................................................................3 – 1
3.2 Data Communications Functions................................................................................................3 – 3
3.2.1 List of functions and commands with dedicated protocols ............................................3 – 3
3.2.2 List of functions in the no-protocol mode.....................................................................3 – 15
3.2.3 List of functions in the bidirectional mode....................................................................3 – 16
3.3 Transmission Control Function .................................................................................................3 – 17
3.4 Half-Duplex Communication Function ......................................................................................3 – 19
3.5 m : n Communication Function .................................................................................................3 – 20
3.6 Mode Switching Function..........................................................................................................3 – 22

−i−

3.7 RS-232C Interface Specifications .............................................................................................3 – 23
3.7.1 RS-232C connector specifications...............................................................................3 – 23
3.7.2 RS-232C cable.............................................................................................................3 – 26
3.8 RS-422/485 Interface Specifications ........................................................................................3 – 27
3.8.1 RS-422/485 terminal block specification .....................................................................3 – 27
3.8.2 RS-422 cable specifications ........................................................................................3 – 28
3.8.3 Precautions during data communication via RS-422 line ............................................3 – 29
3.9 I/O Signals List for PC CPU......................................................................................................3 – 33
3.10 Buffer Memory Applications and Allocation ..............................................................................3 – 37

4. SETTINGS AND PROCEDURES BEFORE OPERATION ....................................................4 – 1 ~ 4 – 36

4.1 Settings and Procedures before Operation ................................................................................4 – 1
4.1.1 Flow of procedures before operation.............................................................................4 – 1
4.1.2 Nomenclature.................................................................................................................4 – 2
4.2 Switch Setting .............................................................................................................................4 – 4
4.2.1 Mode setting switch .......................................................................................................4 – 4
4.2.2 Setting transmission specifications, main channel, etc. ............................................... 4 – 7
4.2.3 Setting the station number setting switches ................................................................4 – 13
4.3 Description of the Indicator LEDs .............................................................................................4 – 14
4.4 Loading and Installation ............................................................................................................4 – 17
4.4.1 Handling instructions ...................................................................................................4 – 17
4.4.2 Installation environment...............................................................................................4 – 17
4.5 Self-Loopback Test ...................................................................................................................4 – 18
4.5.1 Procedure to carry out the self-loopback test ..............................................................4 – 18
4.5.2 Self-loopback text operations ......................................................................................4 – 20
4.6 External Wiring..........................................................................................................................4 – 21
4.6.1 Precautions during wiring ............................................................................................4 – 21
4.6.2 Connecting the RS-232C connectors ..........................................................................4 – 21
4.6.3 Connecting the RS-422 connectors.............................................................................4 – 27
4.7 Setting/Connecting Terminal Resistors.....................................................................................4 – 32
4.8 Setting the Operation Mode and Starting Operation.................................................................4 – 35
4.8.1 Loopback test ..............................................................................................................4 – 35
4.8.2 Setting the mode..........................................................................................................4 – 36
4.8.3 Writing values to buffer memory specific use areas and
starting operation .........................................................................................................4 – 36
4.9 Maintenance and Inspection.....................................................................................................4 – 36

5. COMMUNICATIONS WITH A COMPUTER
IN THE DEDICATED PROTOCOL ...................................................................................... 5 – 1 ~ 5 – 134

5.1 Data Flow in Communications with Dedicated Protocols ...........................................................5 – 1
5.2 Programming Hints .....................................................................................................................5 – 2
5.2.1 Reading/Writing data from/to the buffer memory...........................................................5 – 2
5.2.2 Procedure for sending commands from the computer ..................................................5 – 6
5.2.3 Operation of the PC CPU during data communications ................................................5 – 9
5.2.4 Precautions for data communications..........................................................................5 – 10

− ii −

5.3 Check Points before Starting Operation ................................................................................... 5 – 11
5.4 Basic Formats of Dedicated Protocol .......................................................................................5 – 12
5.4.1 Basics of dedicated protocol control procedures.........................................................5 – 13
5.4.2 Control format 1 ...........................................................................................................5 – 14
5.4.3 Control format 2 ...........................................................................................................5 – 16
5.4.4 Control format 3 ...........................................................................................................5 – 18
5.4.5 Control format 4 ...........................................................................................................5 – 20
5.4.6 Names of data to be specified in control formats ........................................................5 – 22
5.5 Transmission Sequence Timing Charts and Communication Time......................................... 5 – 31
5.6 Character Area Data Transmission...........................................................................................5 – 35
5.7 Device Memory Read/Write......................................................................................................5 – 38
5.7.1 Commands and device ranges ....................................................................................5 – 38
5.7.2 Batch read in units of bits (BR, JR command) .........................5 – 44
5.7.3 Batch read in units of words (WR, QR command) .......................5 – 45
5.7.4 Batch write in units of bits (BW, JW command) ........................5 – 47
5.7.5 Batch write in units of words (WW, QW command) ......................5 – 48
5.7.6 Testing device memory in units of bits (random write)
(BT, JT command) ......................................................................................................5 – 50
5.7.7 Testing device memory in units of words (random write)
(WT, QT command) ....................................................................................................5 – 51
5.7.8 Monitoring device memory...........................................................................................5 – 52
(1) Control procedure for monitoring ..........................................................................5 – 52
(2) Registering devices for data monitoring in device memory
in units of bits (BM, JM command).........................5 – 53
in units of words (WM, QM command).......................5 – 54
(3) Monitoring devices registered in device memory for data monitoring
in units of bits (MB, MJ command).........................5 – 55
in units of words (MN, MQ command) .......................5 – 56
5.8 Extension File Register Read and Write...................................................................................5 – 57
5.8.1 ACPU common commands and addresses.................................................................5 – 57
5.8.2 AnA/AnUCPU common commands and device numbers ...........................................5 – 59
5.8.3 Precautions during extension file register read/write...................................................5 – 62
5.8.4 Batch read of the extension file register (ER command) ............................... 5 – 63
5.8.5 Batch write of the extension file register (EW command) .............................. 5 – 64
5.8.6 Direct read of the extension file register (NR command)............................... 5 – 65
5.8.7 Direct write of the extension file register (NW command) .............................. 5 – 66
5.8.8 Testing (random write) the extension file register
(ET command) ................................5 – 67
5.8.9 Monitoring the extension file register ...........................................................................5 – 68
(1) Control procedure for monitoring ..........................................................................5 – 68
(2) Registering extension file registers for data monitoring
(EM command) ...............................5 – 69
(3) Monitoring extension file registers (ME command) ...............................5 – 70

− iii −

5.9 Buffer Memory Read and Write ................................................................................................5 – 71
5.9.1 Commands and buffer memory ...................................................................................5 – 71
5.9.2 Reading data from buffer memory (CR command)................................5 – 72
5.9.3 Writing data to buffer memory (CW command) ...............................5 – 73
5.10 Special Function Module Buffer Memory Read and Write........................................................5 – 74
5.10.1 Commands and designation ........................................................................................5 – 74
5.10.2 Special function module numbers using control protocols ..........................................5 – 76
5.10.3 Reading data from the special function module buffer memory
(TR command) ................................5 – 79
5.10.4 Writing data to the special function module buffer memory
(TW command) ...............................5 – 80
5.11 PC CPU Remote RUN/STOP and PC CPU Model Code/Name Read.....................................5 – 81
5.11.1 Commands and their functions ....................................................................................5 – 81
5.11.2 Remote RUN/STOP (RR, RS command).........................5 – 82
5.11.3 PC CPU model code and name read (PC, PU command)........................ 5 – 87
5.12 Program Read/Write .................................................................................................................5 – 89
5.12.1 Precautions during program read/write .......................................................................5 – 89
5.12.2 Program read/write control procedures .......................................................................5 – 90
5.12.3 Parameter memory read/write .....................................................................................5 – 92
(1) Commands and addresses ...................................................................................5 – 92
(2) Parameter memory batch read (PR command) ................................5 – 93
(3) Parameter memory batch write (PW command) ...............................5 – 94
(4) Parameter memory analysis request (PS command) ................................5 – 95
5.12.4 Sequence program read/write .....................................................................................5 – 96
(1) Commands and step allocation.............................................................................5 – 96
(2) Designating a program when an XR or XW command is used.............................5 – 98
(3) Sequence program batch read (XR, MR, SR command) .................5 – 99
(4) Sequence program batch write (XW, MW, SW command) .............5 – 102
5.12.5 Microcomputer program read/write............................................................................5 – 105
(1) Commands and addresses .................................................................................5 – 105
(2) Microcomputer program batch read (UR, VR command).......................5 – 107
(3) Microcomputer program batch write (UW, VW command) .....................5 – 108
5.12.6 Comment memory read/write ....................................................................................5 – 109
(1) Commands and addresses .................................................................................5 – 109
(2) Comment memory batch read (KR command) .............................. 5 – 110
(3) Comment memory batch write (KW command) ............................. 5 – 111
5.12.7 Extension comment memory read/write .................................................................... 5 – 112
(1) Commands and addresses ................................................................................. 5 – 112
(2) Extension comment memory batch read (DR command).............................. 5 – 113
(3) Extension comment memory batch write (DW command) ............................. 5 – 114
5.13 Global Function....................................................................................................................... 5 – 115
5.13.1 Commands and control.............................................................................................. 5 – 115
5.13.2 Control protocols for the global function (GW command)............................ 5 – 116
5.14 On-Demand Function ............................................................................................................. 5 – 117
5.14.1 On-demand handshake I/O signal and buffer memory.............................................. 5 – 118
5.14.2 On-demand function execution procedure ................................................................ 5 – 119
5.14.3 Control protocols for the on-demand function ...........................................................5 – 122

− iv −

5.15 Switching between the Data Link System and the Network System
to Access Another Station (for AnUCPU) ...............................................................................5 – 125
5.15.1 Procedure for accessing another station ...................................................................5 – 126
5.15.2 Commands and their functions ..................................................................................5 – 128
5.15.3 Network registration (ZE command) ..............................5 – 129
5.15.4 Network reading (ZR command) ..............................5 – 130
5.15.5 Routing parameters reading (ZT command)...............................5 – 132
5.16 Loopback Test.........................................................................................................................5 – 134
(1) ACPU common command and its functions........................................................5 – 134
(2) Loopback test control protocol (TT command)...............................5 – 134

6. COMMUNICATIONS WITH EXTERNAL DEVICES
IN THE NO-PROTOCOL MODE ............................................................................................6 – 1 ~ 6 – 37

6.1 Data Flow in the No-Protocol Mode............................................................................................6 – 1
6.2.1 Receiving data from external device..............................................................................6 – 3
6.2.2 Sending data to external device ..................................................................................6 – 12
6.2.3 Handshake I/O signals.................................................................................................6 – 14
6.2.4 Reading and writing buffer memory.............................................................................6 – 15
6.2.5 Precautions during data communications....................................................................6 – 25
6.3 Pre-Operation Check Points .....................................................................................................6 – 26
6.4 Data Receiving Procedure in the No-Protocol Mode
(External Device → Computer Link Module) ............................................................................6 – 27
6.4.1 Data receive procedure ...............................................................................................6 – 27
6.4.2 Data receive program ..................................................................................................6 – 27
6.5 Data Sending Procedure in the No-Protocol Mode
(Computer Link Module → External Device) ............................................................................6 – 32
6.5.1 Data sending procedure ..............................................................................................6 – 32
6.5.2 Data sending program .................................................................................................6 – 32

7. COMMUNICATIONS WITH A COMPUTER IN THE BIDIRECTIONAL MODE.................... 7 – 1 ~ 7 – 40

7.1 Data Flow in the Bidirectional Mode ...........................................................................................7 – 2
7.2.1 System configuration and communications mode
for bidirectional mode communications .........................................................................7 – 3
7.2.2 Receiving data from the computer.................................................................................7 – 4
7.2.3 Sending data to the computer........................................................................................7 – 9
7.2.4 Processing a computer link module for simultaneous send
in full-duplex mode.......................................................................................................7 – 12
7.2.5 Handshake I/O signals.................................................................................................7 – 15
7.2.6 Reading and writing buffer memory.............................................................................7 – 15
7.2.7 Precautions during data communications....................................................................7 – 24
7.3 Pre-Operation Check Points .....................................................................................................7 – 26
7.4 Bidirectional Control Procedure Basics ....................................................................................7 – 27
7.4.1 How to read the charts of bidirectional control protocols............................................ 7 – 27
7.4.2 Control protocol in bidirectional mode .........................................................................7 – 28
7.4.3 Contents of data designation items in bidirectional mode .......................................... 7 – 30

−v−

7.5 Data Receiving Procedure in the Bidirectional Mode
(Computer → Computer Link Module)......................................................................................7 – 33
7.5.1 Data receive procedure ...............................................................................................7 – 33
7.5.2 Data receive program ..................................................................................................7 – 33
7.6 Data Sending Procedure in the Bidirectional Mode
(Computer link module → Computer) .......................................................................................7 – 37
7.6.1 Data sending procedure ..............................................................................................7 – 37
7.6.2 Data sending program .................................................................................................7 – 37

8. WHEN READING SIGNAL/SETTING INFORMATION
IN THE COMPUTER LINK .......................................................................................................8 – 1 ~ 8 – 6

8.1 Reading Transmission Error Data and Turn-OFF Request ........................................................8 – 1
8.1.1 Reading the error LED display status ............................................................................8 – 1
8.1.2 Turning OFF error LEDs ................................................................................................8 – 2
8.2 Reading the RS-232C Signal Status...........................................................................................8 – 3
8.3 Reading Switch Settings and Operation Mode ..........................................................................8 – 4
8.3.1 Reading the settings of the mode setting switch and station number setting switches 8 – 4
8.3.2 Reading the settings of the transmission specification setting switches ......................8 – 5
8.3.3 Reading the ongoing operation mode ..........................................................................8 – 6

9. WHEN COMMUNICATING DATA AFTER CHANGING TO DC1 TO DC4 CONTROL
METHOD ................................................................................................................................9 – 1 ~ 9 – 12

9.1 Precautions When Controlling Transmission..............................................................................9 – 1
9.2 Transmission Control .................................................................................................................9 – 5
9.2.1 DTR/DSR (ER/DR) control ............................................................................................9 – 5
9.2.2 DC1/DC3 transmission control ......................................................................................9 – 6
9.2.3 DC1/DC3 receive control ...............................................................................................9 – 8
9.2.4 DC2/DC4 transmission control ......................................................................................9 – 8
9.2.5 DC2/DC4 receive control ...............................................................................................9 – 9
9.3 Writing Data to Buffer Memory Specific Use Area ...................................................................9 – 10

10. WHEN COMMUNICATING DATA AFTER CHANGING TO HALF-DUPLEX
TRANSMISSIONS ..............................................................................................................10 – 1 ~ 10 – 12

10.1 Precautions for Half-Duplex Transmission ..............................................................................10 – 2
10.2 Connector Cable Connections for Half-Duplex Transmission .................................................10 – 3
10.3 ON/OFF Timing of the CD and RS Signals of the Computer Link Module...............................10 – 4
10.3.1 Data transmission timing from an external device.......................................................10 – 4
10.3.2 Data transmission timing from a computer link module...............................................10 – 7
10.4 Writing Data to Buffer Memory Specific Use Areas ...............................................................10 – 10

− vi −

11. WHEN COMMUNICATING DATA WITH M:N RATIO OF
COMPUTER TO PC CPU FOR CONNECTION................................................................. 11 – 1 ~ 11 – 11

11.1 Key Points ................................................................................................................................ 11 – 1
11.2 Conditions for Computer Interlock ........................................................................................... 11 – 2
11.2.1 Computer station number allocation ............................................................................ 11 – 2
11.2.2 Maximum data communications time per computer .................................................... 11 – 3
11.2.3 Command and message format for data communications
among computers ........................................................................................................ 11 – 4
11.3 Procedure for Data Communications with a PC CPU ............................................................. 11 – 5
11.3.1 Communications between each computer and PC CPUs .......................................... 11 – 5
11.3.2 Data communications with PC CPUs by setting a master station
and slave stations ....................................................................................................... 11 – 8

12. WHEN CHANGING OVER MODE DURING OPERATION
OF COMPUTER LINK ....................................................................................................... 12 – 1 ~ 12 – 16

12.1 Precautions When Mode Switching .........................................................................................12 – 1
12.2 Mode Switching Function and Operation of the Computer Link Module .................................12 – 3
12.2.1 Mode switching function .............................................................................................12 – 3
12.2.2 Operation (Processing) of the computer link module
during mode switching ................................................................................................12 – 4
12.3 Handshake I/O Signals for Mode Switching and Buffer Memory ............................................12 – 6
12.4 Mode Switching from the PC CPU............................................................................................12 – 8
12.4.1 Mode switching procedure ..........................................................................................12 – 8
12.4.2 Mode switching program example ..............................................................................12 – 9
12.5 Mode Switching from the Computer ......................................................................................12 – 12
12.5.1 Mode switching procedure.........................................................................................12 – 12
12.5.2 Mode switching program example ............................................................................12 – 13

13. TROUBLESHOOTING OF COMPUTER LINK FUNCTIONS ............................................13 – 1 ~ 13 – 13

13.1 NAK Error Codes with Dedicated Protocols .............................................................................13 – 1
13.2 NAK Error Codes in the Bidirectional Mode .............................................................................13 – 4
13.3 Indications of LEDs in Case of Trouble and Corrective Action ................................................13 – 5
13.4 Troubleshooting OFF ................................................................................................................13 – 7
13.4.1 Troubleshooting flow chart...........................................................................................13 – 7
13.4.2 When the “RUN LED” is turned OFF ...........................................................................13 – 8
13.4.3 When the neutral state does not change or data is not received ............................. 13 – 10
13.4.4 When the 2-C/N LED (C/N LED) or 4-C/N LED (C/N LED) is
turned ON .................................................................................................................. 13 – 11
13.4.5 When communications sometimes fails ....................................................................13 – 12
13.4.6 When undercoded data is transmitted .......................................................................13 – 13

− vii −

PRINTER FUNCTION

14. SYSTEM CONFIGURATION AND AVAILABLE DEVICES .................................................14 – 1 ~ 14 – 8

14.1 1 : 1 Ratio of a Printer to a PC CPU .........................................................................................14 – 2
14.2 2 : 1 Ratio of a Computer and Printer to a PC CPU .................................................................14 – 3
14.3 When the Computer- and Printer-to-PC CPU Ratios are 2 : n and m : n ................................14 – 6

15. SPECIFICATIONS ..............................................................................................................15 – 1 ~ 15 – 10

15.1 Printer Function ........................................................................................................................15 – 1
15.1.1 Printer functions list ....................................................................................................15 – 1
15.1.2 Free message and fixed message .............................................................................15 – 2
15.1.3 List of commands for registering or reading messages
from the computer (for dedicated protocols)................................................................15 – 3
15.2 RS-232C Interface Specifications ............................................................................................15 – 3
15.3 RS-422 Interface Specifications ...............................................................................................15 – 3
15.4 List of I/O Signals to the PC CPU .............................................................................................15 – 4
15.5 Buffer Memory Applications and Allocation ..............................................................................15 – 6

16. SETTING AND PROCEDURES BEFORE OPERATION.....................................................16 – 1 ~ 16 – 7

16.1 Outline of Procedure Before Operation ...................................................................................16 – 1
16.2 Switch Setting ...........................................................................................................................16 – 2
16.3 Description of the Indicator LEDs ............................................................................................16 – 3
16.4 Loading and Installation ...........................................................................................................16 – 5
16.5 Self-Loopback Test ..................................................................................................................16 – 5
16.6 Connecting External Devices to the Computer Link Module ...................................................16 – 5
16.7 Setting the Operation Mode and Starting Operation ................................................................16 – 6
16.7.1 Loopback test .............................................................................................................16 – 6
16.7.2 Setting the mode .........................................................................................................16 – 6
16.7.3 Writing values to buffer memory specific use areas
and starting operation .................................................................................................16 – 7
16.8 Maintenance and Inspection ....................................................................................................16 – 7

17. MESSAGE PRINTING METHOD USING PRINTER FUNCTIONS....................................17 – 1 ~ 17 – 43

17.1 Flow of Data When the Printer Functions are Used ................................................................17 – 1
17.2 Precautions Before Programming.............................................................................................17 – 2
17.2.1 Reading/Writing data from/to buffer memory specific use areas ................................17 – 2
17.2.2 Message output timing...............................................................................................17 – 12
17.2.3 Method of detecting a printer function error...............................................................17 – 14
17.2.4 Precautions when using a printer function.................................................................17 – 15
17.3 Registering/Reading Fixed Messages from the Computer ....................................................17 – 17
17.3.1 Commands and their functions .................................................................................17 – 17
17.3.2 Method of registering fixed messages ......................................................................17 – 18
17.3.3 Method of reading fixed messages ...........................................................................17 – 19

− viii −

17.4 Registering/Reading Messages from the PC CPU.................................................................17 – 20
17.4.1 Method of registering fixed messages ......................................................................17 – 20
17.4.2 Method of reading fixed messages ...........................................................................17 – 24
17.4.3 Method of registering free messages .......................................................................17 – 27
17.4.4 Method of reading free messages ............................................................................17 – 30
17.5 Printer Test .............................................................................................................................17 – 32
17.6 Registered Message Test Output (Test Printing) ....................................................................17 – 34
17.7 Message Output to the Printer ...............................................................................................17 – 36
17.8 Example of Program for Message Output to the Printer
Using the Printer Functions ...................................................................................................17 – 41

18. TROUBLESHOOTING OF PRINTER FUNCTIONS ............................................................18 – 1 ~ 18 – 7

18.1 Error Codes When Using a Printer Function ...........................................................................18 – 1
18.2 Indications of LEDs in Case of Trouble and Corrective Action................................................ 18 – 2
18.3 Troubleshooting ........................................................................................................................18 – 4
18.3.1 Troubleshooting flow chart...........................................................................................18 – 4
18.3.2 When printer functions cannot be used .......................................................................18 – 5
18.3.3 When output to the printer is disabled .........................................................................18 – 6
18.3.4 When the message cannot be registered....................................................................18 – 7
18.3.5 When wrong characters are output..............................................................................18 – 7

APPENDICES

APPENDICES .....................................................................................................................APP – 1 ~ APP – 27

APPENDIX 1 ASCII CODE TABLE ......................................................................................................APP – 1
APPENDIX 2 COMMUNICATION TIME BETWEEN A PC CPU AND
A COMPUTER LINK MODULE (SCAN TIME INCREASE) ...........................................APP – 2
APPENDIX 3 SPECIAL FUNCTION MODULE BUFFER MEMORY ADDRESSES............................APP – 5
APPENDIX 4 COMPATIBILITY BETWEEN AJ71UC24 AND AJ71C24-S8
AND PRECAUTIONS FOR SIMULTANEOUS USE OF THESE
MODULES .....................................................................................................................APP – 8
4.1 Compatibility ..........................................................................................................................APP – 8
4.2 Precautions for Utilizing the AJ71UC24 Instead of the AJ71C24-S8 ................................... APP – 8
4.3 Comparison of Functions .......................................................................................................APP – 9
APPENDIX 5 USING THE COMPUTER LINK MODULE WITH A QnA PROGRAMMABLE
CONTROLLER ............................................................................................................APP – 10
APPENDIX 6 EXAMPLES OF COMPUTER LINK PROGRAMS.......................................................APP – 12
6.1 Examples of Sequence Programs for Data Communications
in the No-protocol Mode ......................................................................................................APP – 12
6.1.1 Sequence program when application instructions are used...................................APP – 13
6.1.2 Sequence program when dedicated instructions are used ....................................APP – 15
6.1.3 Example of receive data clear processing program ...............................................APP – 16
APPENDIX 7 Communication support tool (MX Component)............................................................APP – 18
7.1 Outline of MX Componentool...............................................................................................APP – 18
7.2 MX Component operating procedure...................................................................................APP – 21
APPENDIX 8 EXTERNAL DIMENSIONS ..........................................................................................APP – 25

− ix −

About Manuals
There are the following manuals related to the computer link/multidrop link modules.

Related Manuals

Manual No.
Name of Manual
(Model Code)
Computer Link Module Guide Book
This guide book describes basically how to communicate data with external
SH-3510
devices (computer, etc.) for each mode of computer link.
This guide book is common to all computer link module (optional).
Computer Link/Multidrop Link Module Type AJ71UC24 User's Manual (Hardware)
This manual describes the system configuration, module specifications, nomenclature and setting, and IB-66559
module external dimensions diagram (contained in the module package).
Computer Link/Multidrop Link Module Type A1SJ71C24-R4 User's Manual (Hardware)
This manual describes the system configuration, module specifications,
IB-66364
nomenclature and setting, and module external dimensions diagram (contained in the
module package).
Computer Link Module Type A1SJ71C24-R2, Computer Link/Printer Function Module Type A1SJ71C24-
PRF User's Manual (Hardware)
This manual describes the system configuration, module specifications, IB-66340
nomenclature and setting, and module external dimensions diagram (contained in the
module package).
A2CCPU(P21/R21), A2CCPU-DC24V, A2CCPUC24(-PRF), A2CJCPU User's Manual
This manual describes the system cenfiguration, specifications and connection of module, PC CPU, IB-66545
power supply module, and troubleshooting.
A2CCPU(P21/R21), A2CCPU-DC24V, A2CCPUC24(-PRF), A2CJCPU User's Manual (Hardware)
This manual describes the handling, nomenclature and setting, specifications and connection of I/O IB-66475
module for use with A2CCPU, error code (contained in the module package).
A1SCPU, A1SCPUC24-R2, A2SCPU User's Manual (Detailed Information)
This manual describes the system configuration, specifications and connection of module, PC CPU, IB-66320
power supply module, and error code (optional).
A1S/A1SC24-R2/A2S/A2ASCPU(S1) User's Manual (Hardware)
This manual describes the handling, nomenclature and setting, specifications and connection of I/O IB-66468
modules for use with AnSCPU, error code (contained in the module package).

Conformation to the EMC Directive and Low Voltage Instruction

For details on making Mitsubishi programmable controller 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 programmable controller CPU to use.
The CE logo is printed on the rating plate on the main body of the programmable controller 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. (A1SCPUC24-R2, A2CCPUC24(PRF) removes.)

1. GENERAL DESCRIPTION
MELSEC-A

This User's Manual describes the functions of computer link and printer at an
appropriate section, among the functions of computer link, printer, and multidrop link
of each module as indicated in Section 1.3.

When applying program examples introduced in this manual into the actual system,
fully examine the applicability and confirm that it will not cause system control
problems.

1.1 General Description of Computer Link Functions

The computer link functions have roughly classified three functions that can be used
for the following operations:

1) Monitoring operation of PC CPU

2) Data collection handled by PC CPU

3) Upload/download of sequence program

General description of each function is explained below.
When the computer link module has two interfaces of RS-422/485 and RS-232C, it
is possible to use two functions among the functions indicated below (by setting and
using either function for each interface):

(1) Dedicated protocol + no-protocol mode

(2) Dedicated protocol + bidirectional mode

(3) Dedicated protocol + printer function (RS-232C only)

POINT
When the computer link function is used for the first time, read the guide book
(optional) below to understand a basic computer link function.
Computer Link Module Guide Book ..... SH-3510

1−1

MELSEC-A
1.1.1 General description and features of computer link in the dedicated protocol

(1) General description

Sending the command statements for computer link from the computer to the
computer link module in the prescribed communicating procedure allows PC
CPU devices and sequence program to be read/written.

Automatic communications RS-232C or RS-422 cable Computer
Com-
PC after the sequence program puter Transmitted data
END processing. link (ASCII code)
CPU ASCII code
module
BIN code Read Transmission control codes
Write
Transmitted data Transmitted data
0 0 0 1 0 0 1 0 0 0 1 1 0 1 0 0 (The computer link module 1 2 3 4
(1234H) converts data between BIN 31H 32H 33H 34H
code and ASCII code.)
Transmission
control codes

Fig. 1.1 Data Transmission with the Dedicated Protocol

(2) Features

(a) Communications at the request of the computer

Data communications is always initiated by the computer.

Designated data is transmitted according to the request command
transmitted from a computer to a computer link module.

It is not necessary to create and change special sequence programs in
order to use a computer link module.
1) Read and write possible to and from all PC CPU devices
Data can be read from all PC CPU devices. This permits observation
and monitoring of all operations, as well as the collection and analysis
of data. Data can be written to all PC CPU devices. This permits
production control and production directives to be carried out.
2) A computer link module can upload and download programs from a PC
CPU.
PC CPU programs (main sequence and subsequence control programs
and microcomputer programs), parameter data and comment data are
read by the computer and stored. When required they can be written to
the PC CPU to change the program.

1−2

MELSEC-A

3) Remote RUN and STOP control of the PC CPU
The PC CPU can be remote-controlled by means of RUN and STOP
instructions from the computer.
4) When multiple computers and PC CPU modules are connected to a link
with a computer link module, the input (X) signals of the CPUs in the
link can be turned ON/OFF using any computer in the link. This
function can immediately stop or simultaneously start all CPUs in the
link.
(This function is called the global function of the computer link module.)

(b) Communications at the request of the PC CPU

The PC CPU transmits the data send request.

When the emergency data needs to be transmitted from a PC CPU to a
computer, the PC CPU transmits a send request to the computer link
module to make the computer execute an interrupt processing.

(This is the on-demand function of the computer link module. )

* : The dedicated protocols consist of four different protocols.
By selecting either format according to the specifications of computer to be
connected, data communication can be performed.
The term “dedicated protocols” used in this manual is the collective term for
these protocols.

POINT
By using the Mitsubishi communication support tool for supporting
communication between the MELSEC-A Series and QnA Series Program-
mable Logic Controller (hereinafter PC) and personal computer, the commu-
nication program on the personal computer side connected with Ethernet or a
computer link, etc., can be simplified.
• MX Component (Basic Communication Support ActiveX Controls,
SW0D5C-ACT-E or later usable)
The outline of the basic communication support tool and an example of its use
are described in Appendix 7.
Refer to it as necessary.

1−3

MELSEC-A
1.1.2 General description and features of computer link in the no-protocol mode


Arbitrary data can be communicated between external devices and PC CPU via
computer link module in the user own communicating procedure.

Com- RS-232C or RS-422cable
Sequence program puter External device
PC TO/FROM instructions link (such as a computer, printer)
module
CPU buffer
00H to FFH 00H to FFH Transmitted data
(Transmitted data) memory
Send
Receive
Transmitted data (Data is transmitted Transmitted data

0 0 0 1 0 0 1 0 0 0 1 1 0 1 0 0 in unchanged code 0 0 0 1 0 0 1 0 0 0 1 1 0 1 0 0
through the buffer
(1234H) (1234H)
memory.)

Fig. 1.2. Data Transmission in the No-Protocol Mode

(2) Features

(a) Data communications can be initiated by a PC CPU

Data communications can be initiated by an external device or any PC
CPU. Data can be transmitted from a PC CPU to an external device by
using the TO instruction in the sequence program to write data to the buffer
memory.

Data transmitted from an external device can be read by a PC CPU using
the FROM instruction in the sequence program.
TO instruction Computer, printer
Computer
PC CPU link module
Computer, measuring
FROM instruction instrument

(b) Receiving data length can be set to variable or fixed:

The length of the data transmitted from an external device and received by
the PC CPU can be set to variable or fixed.
1) Receiving variable-length data:
Data receive stops when the receive completed code set by the user is
received.
2) Receiving fixed-length data:
Data receive stops when the fixed length of data set by the user is
received.

Both the receive completed code and the receive-completion data length
can be freely set by the user.

(c) Variable communications memory area

The user memory area can be allocated to suit the purpose and application
of the data transmission.

1−4

MELSEC-A
(d) Monitoring the PLC CPU

Using the mail transmission module, e-mail notification can be made via the
DoPa network through communication according to the TTY protocol.
R

Refer to the manual of the FX-232DOPA mail transmission module for
details.

[Device to be used (Introduced item)]
Mail transmission module : MELSEC-F Series FX-232DOPA mail
transmission module
Radio set compatible with DoPa : Dopa Mobile Ark 9601D *1
R

Internet

RS-232 cable * 3 Internet service Internet service
R
DoPa network provider supporting provider
DoPa R
*2

Mail transmission Radio set compatible
module with DoPa R
A Series C24

Notification via e-mail Cellular phone PC

*1: Purchase DoPa Mobile Ark 9601D from NTT DoCoMo, Inc.
Contact NTT DoCoMo group for the purchasing method.

*2: E-mail service contract is necessary with an Internet service provider supporting
the DoPa network, to transmit e-mail.
R

You can use the service at a provider such as Mopera R
of NTT DoCoMo, Inc.

*3: To use FX-232DOPA-CAB2 for the connection between 3A Series C24 and FX-
232DOPA, a male/female (9-pin female to 9-pin male) converter is necessary.

1−5

MELSEC-A
1.1.3 General description and features of computer link in the bidirectional mode


Arbitrary data can be communicated between the computer and the PC CPU
via computer link module in the prescribed communicating procedure.

Com- RS-232C or RS-422 cable Computer
Sequence program puter
PC TO/FROM instructions link
module Transmitted data
CPU 00H to FFH
00H to FFH buffer
(Transmitted data) memory Send Transmission control codes
Receive
(Data is transmit-
Transmitted data ted in unchanged Transmitted data
code through the
0 0 0 1 0 0 1 0 0 0 1 1 0 1 0 0 buffer memory. 0 0 0 1 0 0 1 0 0 0 1 1 0 1 0 0
(1234H) Transmission (1234H)
control codes are
also added or re- Transmission control codes
moved.)

Fig. 1.3 Data Transmission in the Bidirectional Mode

(2) Features

(a) Data communications can be initiated by a PC CPU

Data communications can be initiated by a computer or any PC CPU. Data
can be transmitted from a PC CPU to an external device by using the TO
instruction in the sequence program to write data to the buffer memory.

The data send operation is completed when the response message to the
sent (received) data is received from the computer. The result of the send
(normal end/error) is stored in the buffer memory and can be read out.

The data received from the computer can be read with the FROM
instruction of the sequence program.

(When data is transmitted by a computer link module)

TO instruction
(Send data)
Y(n+1)0 ON Data send
Computer
(Send request) Computer
PC CPU link
Xn0 ON Response receive
(Send completed) module
FROM instruction
(Send result)

1−6

MELSEC-A
(b) Data length is set within the send message

Data length is set within the send message when the data is transmitted to
a device.

The receiving side recognizes the data length by the send message.
Transmission
sequence

E Data Sum
N length Data check
Q

The send data of the computer link module is processed as follows.
ENQ…………Added to the head.

Data length…The send data length set in the buffer memory is transmitted.

Data…………The send data stored in the buffer memory is transmitted.

Sum check….Computed with the sum checking range in a message.

The data transmitted by a computer and received by a computer link
module is processed as follows.
ENQ………...Checked and removed from the received data.

Data length…Stored in the buffer memory as the received data length.

Data………...Stored in the buffer memory as the received data.

Sum check…Checked and removed from the received data.

(c) Variable communications memory area

The user memory area can be allocated to suit the purposes and
applications of the data transmission.

1−7

Function Computer link function
A1SJ71UC24 A1SJ71C24 A1SCPU A2CCPU A2CCPU
Applicable AJ71UC24
-R2 -R4 -PRF -R2 -R4 -PRF C24-R2 C24 C24-PRF
module

O O O
Remarks

MELSEC-A
1.2 General Description of Printer Function

By connecting the printer to the RS-232C interface of the computer link module,
it is possible to print the messages (fixed messages) previously registered to
the computer link module and any messages (free messages) registered when
necessary.

General description of printer function is explained below.

When the computer link module has two interfaces of RS-422/485 and RS-
232C, it is possible to use it together with the dedicated protocol for the
computer link function as shown in Section 1.1.1.
• RS-422/485 interface…….Dedicated protocol
• RS-232C interface………..Printer function

Com- RS-232C cable
Sequence program puter Printer
PC TO/FROM instructions link
CPU module
00H to FFH buffer 00H to FFH Transmitted data
(Transmitted data) memory Transmit

Transmitted data Transmitted data
(The sent data is sent with 1234
12 3 4 CRLF 1 2 3 4 CRLF
31H 32H 33H 34H 0DH 0AH
the same code via buffer 31H 32H 33H 34H 0DH0AH
memory .)
(Message)

Fig. 1.4 Transmitted Data of Printer Function

1−8

MELSEC-A

(2) Features

(a) Registering and reading a message

1) When the computer is connected via RS-422 interface, fixed
messages up to 80 characters per message can be registered and
read by using a computer with a CI (for registering) command
(dedicated protocol) and a CJ (for reading) command.

2) Fixed/free messages up to 80 characters per message can be
registered and read by using the PC CPU with a TO (for registering)
instruction and a FROM (for reading) instruction.

(b) Number of messages

Free messages can be registered up to 31 messages, and fixed messages,
up to 400 messages.

(c) Printer output

Free and fixed messages for requested quantity of data can be output to a
printer by making an output request from the PC CPU.

(d) Test output
Registered fixed messages or ASCII codes (21H to 7EH) can be output to
a printer.

1−9

MELSEC-A
1.3 General Description and Functions of Computer Link Module

1.3.1 General description and functions

This section describes appropriate computer link module type and description and
function of each module.
Function
Model Description Computer Link Printer Multidrop
Function Function Link Function
(1) Building block type module
AJ71UC24 (2) Equipped with one channel of RS-232C and O X O
RS-422/485 interface, respectively
(1) Small building block type module
A1SJ71UC24-R2
(2) Equipped with one channel of RS-232C O X X
A1SJ71C24-R2
interface
A1SJ71UC24-PRF
(2) Equipped with one channel of RS-232C O O X
A1SJ71C24-PRF
interface
A1SJ71UC24-R4
(2) Equipped with one channel of RS-422/485 O X O
A1SJ71C24-R4
interface
(1) Small PC CPU module
A1SCPUC24-R2 (2) Equipped with one channel of RS-232C O X X
interface
A2CCPUC24 (2) Equipped with one channel of RS-232C, O X X
A2CCPUC24-PRF (2) Equipped with one channel of RS-232C, O O X

O: With function X: Without function

REMARK

After unpacking the container, check to ensure that the following items are delivered with the
product.
Items not indicated below should be arranged by the user separately.

Product Name Items Q'ty
Module 1
AJ71UC24 Terminal resistor 330 Ω, 1/4W (orange/orange/brown/[ ]) 2
Terminal resistor 110 Ω, 1/2W (brown/brown/brown/[ ]) 2
A1SJ71UC24-R2, A1SJ71C24-R2, Module 1
A1SJ71UC24-PRF, A1SJ71C24-PRF,
A1SCPUC24-R2, 9-pin D-sub connector (male), screw tightening type 1
Module 1
A1SJ71UC24-R4, A1SJ71C24-R4 Terminal resistor 330 Ω, 1/4W (orange/orange/brown/[ ]) 2
Terminal resistor 110 Ω, 1/2W (brown/brown/brown/[ ]) 2
Module 1
A2CCPUC24, A2CCPUC24-PRF 9-pin D-sub connector (male), screw tightening type 1
Battery (A6BAT) 1

1 − 10

MELSEC-A

1.3.2 How to confirm the version of computer link module

In this manual, a software version in question is shown at the upper right of an
appropriate page to indicate the computer link module that has the restriction of
contents and functions (For description of way of looking at, refer to Section 1.4.)
If it is necessary to confirm the software version of appropriate computer link
module, make sure of it by a seal at the following position.

A1SJ71UC24-[ ]
AJ71UC24 A1SJ71C24-[ ] A2CCPUC24-[ ]

(Front view)
A B
(Front view) (Front view)
Software version
Hardware version

1 − 11

Sh3511m

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