Mitsubishi MELSEC-AnS Series User manual

A- 1
SAFETY PRECAUTIONS
(Read these precautions before using this product.)
Before using this product, please read this handbook and the relevant manuals introduced in this handbook
carefully and pay full attention to safety to handle the product correctly.
The precautions given in this handbook are concerned with this product only. For the safety precautions of
the programmable controller system, refer to the user's manual for the CPU module used.
In this manual, the safety precautions are classified into two levels: " WARNING" and " CAUTION".
Under some circumstances, failure to observe the precautions given under " CAUTION" may lead to
serious consequences.
Observe the precautions of both levels because they are important for personal and system safety.
Make sure that the end users read this handbook and then keep the handbook in a safe place for future
reference.
[Design Precautions]
WARNING
●For the operating status of each station after a communication failure, refer to the manuals for the
stations used.
Incorrect output or malfunction due to a communication failure may result in an accident.
●When connecting a peripheral with the CPU module or connecting a personal computer with an
intelligent function module to modify data of a running programmable controller, configure an
interlock circuit in the program to ensure that the entire system will always operate safely.
For other forms of control (such as program modification or operating status change) of a running
programmable controller, read the relevant manuals carefully and ensure that the operation is safe
before proceeding.
Especially, when a remote programmable controller is controlled by an external device, immediate
action cannot be taken if a problem occurs in the programmable controller due to a communication
failure.
To prevent this, configure an interlock circuit in the program, and determine corrective actions to be
taken between the external device and CPU module in case of a communication failure.
●Do not write any data to the "system area" of the buffer memory in the intelligent function module.
Also, do not use any "use prohibited" signal as an output signal from the CPU module to the
intelligent function module.
Doing so may cause malfunction of the programmable controller system.
WARNING
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 minor or moderate injury or property damage.

A- 2
[Design Precautions]
[Installation Precautions]
[Installation Precautions]
[Wiring Precautions]
CAUTION
●Do not install the control lines or communication cables together with the main circuit lines or power
cables.
Keep a distance of 100mm or more between them.
Failure to do so may result in malfunction due to noise.
WARNING
●Shut off the external power supply (all phases) used in the system before connecting or
disconnecting a module.
Failure to do so may result in electric shock or cause the module to fail or malfunction.
CAUTION
●Use the programmable controller in an environment that meets the general specifications in the
Safety Guidelines provided with the CPU module or head module.
Failure to do so may result in electric shock, fire, malfunction, or damage to or deterioration of the
product.
●To interconnect modules, engage the respective connectors and securely lock the module joint
levers.
Incorrect interconnection may cause malfunction, failure, or drop of the module.
●Do not directly touch any conductive parts and electronic components of the module.
Doing so can cause malfunction or failure of the module.
WARNING
●Shut off the external power supply (all phases) used in the system before wiring.
Failure to do so may result in electric shock or cause the module to fail or malfunction.
●After installation and wiring, attach the included terminal cover to the module before turning it on for
operation.
Failure to do so may result in electric shock.

A- 3
[Wiring Precautions]
CAUTION
●Use applicable solderless terminals and tighten them within the specified torque range.
If any spade solderless terminal is used, it may be disconnected when a terminal block screw comes
loose, resulting in failure.
●Connectors for external devices must be crimped or pressed with the tool specified by the
manufacturer, or must be correctly soldered.
Incomplete connections may cause short circuit, fire, or malfunction.
●Securely connect the connector to the module.
●Place the cables in a duct or clamp them.
If not, dangling cable may swing or inadvertently be pulled, resulting in damage to the module or
cables or malfunction due to poor contact.
●Check the interface type and correctly connect the cable. Incorrect wiring (connecting the cable to an
incorrect interface) may cause failure of the module and external device.
●Tighten the terminal block screws within the specified torque range.
Undertightening can cause short circuit, fire, or malfunction.
Overtightening can damage the screw and/or module, resulting in drop, short circuit, fire, or
malfunction.
●When disconnecting the cable from the module, do not pull the cable by the cable part.
For the cable with connector, hold the connector part of the cable.
For the cable connected to the terminal block, loosen the terminal screw.
Pulling the cable connected to the module may result in malfunction or damage to the module or
cable.
●Prevent foreign matter such as dust or wire chips from entering the module.
Such foreign matter can cause a fire, failure, or malfunction.
●A protective film is attached to the top of the module to prevent foreign matter, such as wire chips,
from entering the module during wiring.
Do not remove the film during wiring.
Remove it for heat dissipation before system operation.

A- 4
[Startup and Maintenance Precautions]
[Startup and Maintenance Precautions]
[Operating Precautions]
[Disposal Precautions]
WARNING
●Do not touch any terminal while power is on. Doing so will cause electric shock or malfunction.
●Shut off the external power supply (all phases) used in the system before cleaning the module or
retightening the terminal block screws.
Failure to do so may result in electric shock.
CAUTION
●Do not disassemble or modify the modules. Doing so may cause failure, malfunction, injury, or a fire.
●Shut off the external power supply (all phases) used in the system before connecting or
disconnecting a module.
Failure to do so may cause the module to fail or malfunction.
●Tighten the terminal block screws within the specified torque range.
Undertightening can cause drop of the component or wire, short circuit, or malfunction.
Overtightening can damage the screw and/or module, resulting in drop, short circuit, or malfunction.
●After the first use of the product (module and terminal block), the number of connections/
disconnections is limited to 50 times (in accordance with IEC 61131-2).
Exceeding the limit may cause malfunction.
●Before handling the module, touch a conducting object such as a grounded metal to discharge the
static electricity from the human body.
Failure to do so may cause the module to fail or malfunction.
CAUTION
●When changing data and operating status, and modifying program of the running programmable
controller from a personal computer connected to an intelligent function module, read relevant
manuals carefully and ensure the safety before operation.
Incorrect change or modification may cause system malfunction, damage to the machines, or
accidents.
●While set values in the buffer memory are being registered to the flash ROM in the module, do not
power off the station where the module is mounted or do not reset the CPU module.
Doing so will affect the flash ROM data, and setting to the buffer memory and registration to the flash
ROM need to be performed again.
Also, it may cause failure or malfunction of the module.
CAUTION
●When disposing of this product, treat it as industrial waste.

A- 5
CONDITIONS OF USE FOR THE PRODUCT
(1) Mitsubishi programmable controller ("the PRODUCT") shall be used in conditions;
i) where any problem, fault or failure occurring in the PRODUCT, if any, shall not lead to any major
or serious accident; and
ii) where the backup and fail-safe function are systematically or automatically provided outside of
the PRODUCT for the case of any problem, fault or failure occurring in the PRODUCT.
(2) The PRODUCT has been designed and manufactured for the purpose of being used in general
industries.
MITSUBISHI SHALL HAVE NO RESPONSIBILITY OR LIABILITY (INCLUDING, BUT NOT
LIMITED TO ANY AND ALL RESPONSIBILITY OR LIABILITY BASED ON CONTRACT,
WARRANTY, TORT, PRODUCT LIABILITY) FOR ANY INJURY OR DEATH TO PERSONS OR
LOSS OR DAMAGE TO PROPERTY CAUSED BY the PRODUCT THAT ARE OPERATED OR
USED IN APPLICATION NOT INTENDED OR EXCLUDED BY INSTRUCTIONS, PRECAUTIONS,
OR WARNING CONTAINED IN MITSUBISHI'S USER, INSTRUCTION AND/OR SAFETY
MANUALS, TECHNICAL BULLETINS AND GUIDELINES FOR the PRODUCT.
("Prohibited Application")
Prohibited Applications include, but not limited to, the use of the PRODUCT in;
• Nuclear Power Plants and any other power plants operated by Power companies, and/or any
other cases in which the public could be affected if any problem or fault occurs in the PRODUCT.
• Railway companies or Public service purposes, and/or any other cases in which establishment of
a special quality assurance system is required by the Purchaser or End User.
• Aircraft or Aerospace, Medical applications, Train equipment, transport equipment such as
Elevator and Escalator, Incineration and Fuel devices, Vehicles, Manned transportation,
Equipment for Recreation and Amusement, and Safety devices, handling of Nuclear or
Hazardous Materials or Chemicals, Mining and Drilling, and/or other applications where there is a
significant risk of injury to the public or property.
Notwithstanding the above, restrictions Mitsubishi may in its sole discretion, authorize use of the
PRODUCT in one or more of the Prohibited Applications, provided that the usage of the PRODUCT
is limited only for the specific applications agreed to by Mitsubishi and provided further that no
special quality assurance or fail-safe, redundant or other safety features which exceed the general
specifications of the PRODUCTs are required. For details, please contact the Mitsubishi
representative in your region.

A- 6
REVISIONS
* The handbook number is given on the bottom left of the back cover.
Japanese Handbook Version L08257-A
© 2012 MITSUBISHI ELECTRIC CORPORATION
Print Date * Handbook Number Revision
October, 2012 L(NA)08261ENG-A First edition
This handbook 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 handbook.

A- 7
SAFETY PRECAUTIONS ................................................................................................................................A - 1
CONDITIONS OF USE FOR THE PRODUCT .................................................................................................A - 5
REVISIONS ......................................................................................................................................................A - 6
GENERIC TERMS AND ABBREVIATIONS ..................................................................................................... A - 9
CHAPTER 1 INTRODUCTION 1 - 1 to 1 - 3
1.1 Modules Targeted for Replacement ................................................................................................ 1 - 1
1.2 General Precautions ........................................................................................................................ 1 - 3
CHAPTER 2 SERIAL COMMUNICATION MODULE REPLACEMENT 2 - 1 to 2 - 28
2.1 List of Serial Communication Modules to be Replaced ................................................................... 2 - 1
2.2 Performance Specifications Comparison ......................................................................................... 2 - 2
2.2.1 Module performance comparison .............................................................................................2-2
2.2.2 Cable specifications comparison .............................................................................................. 2 - 7
2.3 Functional Comparison .................................................................................................................... 2 - 9
2.4 Switch Setting Comparison ............................................................................................................ 2 - 11
2.5 Program Comparison ..................................................................................................................... 2 - 14
2.5.1 I/O signal comparison ............................................................................................................. 2 - 14
2.5.2 Buffer memory address comparison ....................................................................................... 2 - 17
2.6 Reuse of Existing Programs .......................................................................................................... 2 - 20
2.6.1 Reuse of AnS series programs ............................................................................................... 2 - 20
2.6.2 Reuse of QnAS series programs ............................................................................................ 2 - 21
2.7 Other Precautions .......................................................................................................................... 2 - 22
2.8 Program Examples ........................................................................................................................ 2 - 23
CHAPTER 3 EXTERNAL DIMENSIONS 3 - 1 to 3 - 2
APPENDICES APPX - 1 to APPX - 3
Appendix 1 Spare Parts Storage .......................................................................................................APPX - 1
Appendix 2 Relevant Manuals ...........................................................................................................APPX - 2
Appendix 2.1 Replacement handbooks .........................................................................................APPX - 2
Appendix 2.2 AnS series ...............................................................................................................APPX - 3
Appendix 2.3 QnAS series ............................................................................................................APPX - 3
Appendix 2.4 L series ....................................................................................................................APPX - 3
CONTENTS

A- 8
●For the products shown in handbooks for transition, catalogues, and transition examples, refer to the
manuals for the relevant products and check the detailed specifications, precautions for use, and
restrictions before replacement.
For the products manufactured by Mitsubishi Electric Engineering Co., Ltd., Mitsubishi Electric
System & Service Co., Ltd., and other companies, refer to the catalogue for each product and check
the detailed specifications, precautions for use, and restrictions before use.
The manuals and catalogues for our products, products manufactured by Mitsubishi Electric
Engineering Co., Ltd., and Mitsubishi Electric System & Service Co., Ltd. are shown in Appendix of
each handbook for transition.
●Products shown in this handbook are subject to change without notice.

A- 9
GENERIC TERMS AND ABBREVIATIONS
Unless otherwise specified, this handbook uses the following generic terms and abbreviations.
Generic term/abbreviation Description
Series
A series The abbreviation for large types of Mitsubishi MELSEC-A series programmable controllers
AnS series The abbreviation for small types of Mitsubishi MELSEC-A series programmable controllers
A/AnS series A generic term for A series and AnS series
QnA series The abbreviation for large types of Mitsubishi MELSEC-QnA series programmable controllers
QnAS series The abbreviation for small types of Mitsubishi MELSEC-QnA series programmable controllers
QnA/QnAS series A generic term for QnA series and QnAS series
A/AnS/QnA/QnAS series A generic term for A series, AnS series, QnA series, and QnAS series
Q series The abbreviation for Mitsubishi MELSEC-Q series programmable controllers
L series The abbreviation for Mitsubishi MELSEC-L series programmable controllers
CPU module type
CPU module A generic term for A series, AnS series, QnA series, QnAS series, Q series, and L series CPU
modules
Basic model QCPU A generic term for the Q00JCPU, Q00CPU, and Q01CPU
High Performance model
QCPU
A generic term for the Q02CPU, Q02HCPU, Q06HCPU, Q12HCPU, and Q25HCPU
* This handbook mainly explains the Q02CPU, Q02HCPU, Q06HCPU, and Q12HCPU.
Process CPU A generic term for the Q02PHCPU, Q06PHCPU, Q12PHCPU, and Q25PHCPU
Redundant CPU A generic term for the Q12PRHCPU and Q25PRHCPU
Universal model QCPU
A generic term for the Q00UJCPU, Q00UCPU, Q01UCPU, Q02UCPU, Q03UDCPU,
Q04UDHCPU, Q06UDHCPU, Q10UDHCPU, Q13UDHCPU, Q20UDHCPU, Q26UDHCPU,
Q03UDECPU, Q04UDEHCPU, Q06UDEHCPU, Q10UDEHCPU, Q13UDEHCPU,
Q20UDEHCPU, Q26UDEHCPU, Q50UDEHCPU, and Q100UDEHCPU
* This handbook mainly explains the Q00UJCPU, Q00UCPU, Q01UCPU, Q02UCPU,
Q03UDCPU, Q04UDHCPU, and Q06UDHCPU as modules that replace the AnS/QnAS
series modules.
The Q10UDEHCPU to Q100UDEHCPU have larger program and memory capacities than
other Universal model QCPUs. (All other specifications and functions are the same.)
LCPU A generic term for the L02CPU, L02CPU-P, L26CPU-BT, and L26CPU-PBT
CPU module model
ACPU A generic term for MELSEC-A series CPU modules
AnSCPU A generic term for MELSEC-AnS series CPU modules
AnNCPU
A generic term for the A1NCPU, A1NCPUP21/R21, A1NCPUP21-S3, A2NCPU, A2NCPU-S1,
A2NCPUP21/R21, A2NCPUP21/R21-S1, A2NCPUP21-S3(S4), A3NCPU, A3NCPUP21/R21,
and A3NCPUP21-S3
AnACPU A generic term for the A2ACPU, A2ACPU-S1, A3ACPU, A2ACPUP21/R21,
A2ACPUP21/R21-S1, and A3ACPUP21/R21
AnUCPU A generic term for the A2UCPU, A2UCPU-S1, A3UCPU, and A4UCPU
AnUS(H)CPU A generic term for the A2USCPU, A2USCPU-S1, and A2USHCPU-S1
A/AnSCPU A generic term for the ACPU and AnSCPU
AnN/AnACPU A generic term for the AnNCPU and AnACPU
AnN/AnA/AnSCPU A generic term for the AnNCPU, AnACPU, and AnSCPU
QnACPU A generic term for MELSEC-QnA series CPU modules
QnASCPU A generic term for MELSEC-QnAS series CPU modules
QnA/QnASCPU A generic term for QnACPU and QnASCPU
A/AnS/QnA/QnASCPU A generic term for ACPU, AnSCPU, QnACPU, and QnASCPU
QCPU A generic term for MELSEC-Q series CPU modules
LCPU A generic term for MELSEC-L series CPU modules

1INTRODUCTION
1- 1
This handbook describes how to replace the following communication modules.
(1) Replacing AnS series computer link modules and QnAS series serial communication
modules
(a) AnS series computer link modules
Point
L series communication modules do not have a function equivalent to the multidrop link function of the
AnS series communication module, A1SJ71UC24-R4.
Consider replacement to a CC-Link system.
1
1 INTRODUCTION
1.1 Modules Targeted for Replacement
• AnS series computer link module:
• QnAS series serial communication module:
Refer to CHAPTER 2.
Refer to CHAPTER 2.
Communications via
RS-232
Communications via
RS-422/485
LJ71C24
RS-232 :1ch
RS-422/485 :1ch
LJ71C24-R2
RS-232 :2ch
LJ71C24
RS-232 :1ch
RS-422/485 :1ch
RS-232 :1ch
RS-422/485 :1ch
A1SJ71UC24-R2
A1SJ71UC24-R4
LJ71C24
or
LJ71C24-R2
LJ71C24

1INTRODUCTION
1- 2
(b) QnAS series serial communication modules
(2) Replacing intelligent communication module
No alternative modules are available in L series. Consider replacement with Q series modules or
replacement of a system including external devices and programs.
Communications via
RS-232
Communications via
RS-422/485
A1SJ71QC24N1
or
A1SJ71QC24N1-R2
A1SJ71QC24N1
RS-232 :1ch
RS-422/485 :1ch
A1SJ71QC24N1-R2
RS-232 :2ch
A1SJ71QC24N1
A1SJ71QC24N1
RS-232 :1ch
RS-422/485 :1ch
LJ71C24
or
LJ71C24-R2
LJ71C24
LJ71C24
RS-232 :1ch
RS-422/485 :1ch
LJ71C24-R2
RS-232 :2ch
LJ71C24
RS-232 :1ch
RS-422/485 :1ch

1INTRODUCTION
1- 3
(1) Utilizing AnS/QnAS series sequence programs in L series systems
AnS/QnAS series sequence programs can be converted for the use in L series systems using GX
Developer. (Note that, with GX Works2, these programs cannot be converted.)
To convert AnS/QnAS series sequence programs and utilize them in L series systems, use GX
Developer.
(2) Creating new L series sequence programs
L series sequence programs can be created using GX Developer or GX Works2.
Use of GX Works2 helps users to make settings (module and communication) and perform debugging
easily.
1.2 General Precautions

2SERIAL COMMUNICATION MODULE REPLACEMENT
2- 1
(1) AnS series
(2) QnAS series
2
2 SERIAL COMMUNICATION MODULE
REPLACEMENT
2.1 List of Serial Communication Modules to be Replaced
AnS series L series alternative model Remarks
A1SJ71UC24-R2
LJ71C24
A1SJ71UC24-R2
RS-232: 1ch, RS-422/485: None
LJ71C24
RS-232: 1ch, RS-422/485: 1ch
LJ71C24-R2
A1SJ71UC24-R2
RS-232: 1ch, RS-422/485: None
LJ71C24-R2
RS-232: 2ch, RS-422/485: None
A1SJ71UC24-R4 LJ71C24
A1SJ71UC24-R4
RS-232: None, RS-422/485: 1ch
LJ71C24
RS-232: 1ch, RS-422/485: 1ch
QnAS series model L series alternative model Remarks
A1SJ71QC24N1 LJ71C24
A1S71QC24N1
RS-232: 1ch, RS-422/485: 1ch
LJ71C24
RS-232: 1ch, RS-422/485: 1ch
A1SJ71QC24N1-R2 LJ71C24-R2
A1S71QC24N1-R2
RS-232: 2ch, RS-422/485: None
LJ71C24-R2
RS-232: 2ch, RS-422/485: None

2SERIAL COMMUNICATION MODULE REPLACEMENT
2- 2
2.2.1 Module performance comparison
(1) Between AnS series and L series
(a) A1SJ71UC24-R2
: Compatible, : Partial change required, ×: Incompatible
2.2 Performance Specifications Comparison
Item
Specifications
Compatibility Precautions for
replacement
AnS series L series
A1SJ71UC24-R2 LJ71C24
LJ71C24-R2
Interface
RS-232 RS-232 compliant (9-pin D-sub) LJ71C24: 1ch
LJ71C24-R2: 2ch
RS-422/485 - RS-422/485 compliant
(2-piece terminal block) -LJ71C24: 1ch LJ71C24-R2: None
Communication
method
Communication
using dedicated
protocol*1
Half-duplex communication
Nonprocedural/
bidirectional
communication
Full-duplex communication (1:1
connection)
Full-duplex communication (1:1
connection)
Half-duplex communication (1:n or
m:n connection)
Synchronization method Start stop synchronization (asynchronous method)
Transmission speed 300 to 19200 bps 50 to 230400 bps
Data format
Start bit 1
Data bit 7 or 8
Party bit 1 (vertical parity) or none
Stop bit 1 or 2
Access cycle
Communication
using dedicated
protocol
One request is processed during the END processing of the connected
CPU module.
Nonprocedural/
bidirectional
communication
Data is sent at each send request and is received at any time.
Communication
using
communication
protocol
-
Upon request by the dedicated
instruction (for both transmission
and reception)
Error detection
Parity check Supported (odd/even)/Not supported
Sum check Supported (MC protocol/
bidirectional)/Not supported
Supported (MC protocol/
bidirectional/communication
protocol)/Not supported
Transmission control
Line
configuration
(connection)
RS-232 1:1
RS-422/485 - 1:1, 1:n, n:1, m:n
(n: max. 32, m+n: max. 32)
DTR/DSR (ER/DR) control
CD signal control
DC1/DC3 (Xon/Xoff) control
DC2/DC4 control
RS-232
Available
Available
Available
RS-422/485
Not available
Not available
Available

2SERIAL COMMUNICATION MODULE REPLACEMENT
2- 3
*1 In the L series, this protocol is called "MELSEC communication protocol" (MC protocol).
Line
configuration
(data
communication)
Communication
using dedicated
protocol
1:1 1:1, 1:n, m:n
(n: max. 32, m+n: max. 32)
For details on linked
operation between
interfaces, refer to the
manual for the module
used.
Nonprocedural
communication 1:1 1:1, 1:n, or n:1 (n: max. 32)
Bidirectional
communication 1:1
Communication
using
communication
protocol
- 1:1 or n:1 (n: max. 32)
Transmission
distance
RS-232 Max. 15m
RS-422/485 - Max. 1200m (overall distance)
Number of writes to E2PROM
and number of writes to flash
ROM
Max. 100000 times on the same
area in E2PROM
Max. 100000 times on the same
area in flash ROM
Number of occupied I/O points 32 points/slot
(I/O assignment: special 32 points)
32 points/slot
(I/O assignment: intelli. 32 points)
Item
Specifications
Compatibility Precautions for
replacement
AnS series L series
A1SJ71UC24-R2 LJ71C24
LJ71C24-R2

2SERIAL COMMUNICATION MODULE REPLACEMENT
2- 4
(b) A1SJ71UC24-R4
: Compatible, : Partial change required, ×: Incompatible
*1 In the L series, this protocol is called "MELSEC communication protocol" (MC protocol).
Item
Specifications
Compatibility Precautions for
replacement
AnS series L series
A1SJ71UC24-R4 LJ71C24
Interface
RS-232 - RS-232 compliant (9-pin D-sub) -
RS-422/485 RS-422/485 compliant RS-422/485 compliant
(2-piece terminal block)
Wiring needs to be
changed.
Communication
method
Communication
using dedicated
protocol*1
Half-duplex communication
Nonprocedural/
bidirectional
communication
Full-duplex communication (1:1 connection)/
Half-duplex communication (1:n or m:n connection)
Synchronization method Start stop synchronization (asynchronous method)
Transmission speed 300 to 19200 bps 50 to 230400 bps
Data format
Start bit 1
Data bit 7 or 8
Party bit 1 (vertical parity) or none
Stop bit 1 or 2
Access cycle
Communication
using dedicated
protocol
One request is processed during the END processing of the connected
CPU module.
Nonprocedural/
bidirectional
communication
Data is sent at each send request and is received at any time.
Communication
using
communication
protocol
-
Upon request by the dedicated
instruction (for both transmission
and reception)
Error detection
Parity check Supported (odd/even)/Not supported
Sum check Supported (MC protocol/bidirectional)/Not supported
Transmission control
Line
configuration
(connection)
RS-232 - 1:1
RS-422/485 1:1, 1:n, n:1, m:n
(n: max. 32, m+n: max. 32)
Line
configuration
(data
communication)
Communication
using dedicated
protocol
1:1, 1:n, m:n
(n: max. 32, m+n: max. 32)
For details on linked
operation between
interfaces, refer to the
manual for the module
used.
Nonprocedural
communication 1:1, 1:n (n: max. 32) 1:1, 1:n, or n:1 (n: max. 32)
Bidirectional
communication 1:1
Communication
using
communication
protocol
- 1:1 or n:1 (n: max. 32)
Transmission
distance
RS-232 - Max. 15m
RS-422/485 Max. 500m (overall distance) Max. 1200m (overall distance)
Number of writes to E2PROM
and number of writes to flash
ROM
Max. 100000 times on the same
area in E2PROM
Max. 100000 times on the same
area in flash ROM
Number of occupied I/O points 32 points/slot
(I/O assignment: special 32 points)
32 points/slot
(I/O assignment: intelli. 32 points)
DTR/DSR (ER/DR) control
CD signal control
DC1/DC3 (Xon/Xoff) control
DC2/DC4 control
RS-232
Available
Available
Available
RS-422/485
Not available
Not available
Available

2SERIAL COMMUNICATION MODULE REPLACEMENT
2- 5
(2) Between QnAS series and L series
: Compatible, : Partial change required, ×: Incompatible
Item
Specifications
Compatibility Precautions for
replacement
QnAS series L series
A1SJ71QC24N1
A1SJ71QC24N1-R2
LJ71C24
LJ71C24-R2
Interface
RS-232 RS-232 compliant (9-pin D-sub) LJ71C24: 1ch
LJ71C24-R2: 2ch
RS-422/485 RS-422/485 compliant
(2-piece terminal block)
RS-422/485 compliant
(2-piece terminal block)
LJ71C24: 1ch
LJ71C24-R2: None
Wiring needs to be
changed.
Communication
using dedicated
protocol*1
Half-duplex communication
Nonprocedural
protocol
communication
Full-duplex communication/half-duplex communication
Bidirectional
protocol
communication
Full-duplex communication/half-duplex communication
Communication
using
communication
protocol
-
Upon request by the dedicated
instruction (for both transmission
and reception)
Synchronization method Start stop synchronization (asynchronous method)
Transmission speed 300 to 115200 bps 50 to 230400 bps
Data format
Start bit 1
Data bit 7 or 8
Party bit 1 (vertical parity) or none
Stop bit 1 or 2
Access cycle
Communication
using dedicated
protocol
Requests are processed during the END processing of the connected
CPU module
Nonprocedural
protocol
communication Data is sent at each send request and is received at any time.
Bidirectional
protocol
communication
Communication
using
communication
protocol
-
Upon request by the dedicated
instruction (for both transmission
and reception)
Error detection
Parity check Supported (odd/even)/Not supported
Sum check Supported/Not supported
Select the status in
parameter or user
frame.
Transmission control
Line
configuration
(connection)
RS-232 1:1
RS-422/485 1:1, 1:n, m:n
(n: max. 32, m+n: max. 32)
1:1, 1:n, n:1, m:n
(n: max. 32, m+n: max. 32)
DTR/DSR (ER/DR) control
RS/CS control
RS-232
Available
Available
RS-422/485
Not available
Not available
CD signal control
DC1/DC3 (Xon/Xoff) control
DC2/DC4 control
Available
Available
Not available
Available

2SERIAL COMMUNICATION MODULE REPLACEMENT
2- 6
*1 In the L series, this protocol is called "MELSEC communication protocol" (MC protocol).
Line
configuration
(data
communication)
Communication
using dedicated
protocol
1:1, 1:n, m:n
(n: max. 32, m+n: max. 32)
For details on linked
operation between
interfaces, refer to the
manual for the module
used.
Nonprocedural
protocol
communication
1:1, 1:n (n: max. 32) 1:1, 1:n, or n:1 (n: max. 32)
Bidirectional
protocol
communication
1:1
Communication
using
communication
protocol
- 1:1 or n:1 (n: max. 32)
Transmission
distance
RS-232 Max. 15m
RS-422/485 Max. 1200m (overall distance)
Number of writes to E2PROM
and number of writes to flash
ROM
Max. 100000 times on the same
area in E2PROM
Max. 100000 times on the same
area in flash ROM
Number of occupied I/O points 32 points/slot
(I/O assignment: special 32 points)
32 points/slot
(I/O assignment: intelli. 32 points)
Item
Specifications
Compatibility Precautions for
replacement
QnAS series L series
A1SJ71QC24N1
A1SJ71QC24N1-R2
LJ71C24
LJ71C24-R2