Mitsubishi Electric MELSEC-A Series User manual

CC-Link System RS-232 Interface Module
User's Manual (MELSOFT Connection Mode)

A- 1
SAFETY PRECAUTIONS
(Always read these instructions before using this equipment.)
Before using this product, please read this manual and the relevant manuals introduced in this manual
carefully and pay full attention to safety to handle the product correctly.
The instructions given in this manual are concerned with this product only. For the safety instructions of the
programmable controller system, please read the user's manual for the CPU module used.
In this manual, the safety precautions are classified into two levels: "WARNING" and "CAUTION".
Note that the CAUTION level may lead to a serious consequence according to the circumstances.
Always follow the instructions of both levels because they are important to personal safety.
Please save this manual to make it accessible when required and always forward it to the end user.
[Design Precautions]
WARNING
●When controlling a running programmable controller (data modification) by connecting a peripheral
to a CPU module or connecting a personal computer to an intelligent/special function module, create
an interlock circuit on the sequence program so that the whole system will operate safely all the time.
Also, before performing other controls (e.g. program modification, operating status change (status
control)), read this manual carefully and ensure the safety.
Especially, in the control from an external device to a programmable controller in a remote location,
some programmable-controller-side problems cannot be resolved immediately due to a data
communication failure.
To prevent this, establish corrective procedures for communication failure between the external
device and the programmable controller CPU, as well as creating an interlock circuit on the
sequence program.
●In the case of a data link error, the operation status of a faulty station is as shown below. Using the
communication status information, create an interlock circuit on the sequence program for the
system to operate safely.
Incorrect output or malfunction can lead to an accident.
(1) All of general-purpose inputs from this module turn OFF.
(2) All of general-purpose outputs from this module turn OFF.
●Depending on the module failure, inputs and outputs may turn ON or OFF incorrectly.
For I/O signals that may cause a serious accident, provide an external monitoring circuit.
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.

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[Installation Precautions]
CAUTION
●Do not bunch the control wires or communication cables with the main circuit or power wires, or
install them close to each other.
They should be installed 100 mm (3.94 inch) or more from each other.
Not doing so could result in noise that would cause erroneous operation.
●Always use the data link terminal block for connection of a CC-Link dedicated cable to a master
module.
Care must be taken because, if the cable is incorrectly inserted into the general-purpose I/O terminal
block instead of the data link terminal block, the module will break down.
CAUTION
●Use the programmable controller in an environment that meets the general specifications given in
this manual.
Using this programmable controller in an environment outside the range of the general specifications
could result in electric shock, fire, erroneous operation, and damage to or deterioration of the
product.
●Using a tool specified by the manufacturer, correctly press, crimp, or solder the wires of the
connector and securely connect the connector to the module.
Incomplete connection may cause a short circuit and/or malfunctions.
●Do not directly touch the module's conductive parts or electronic components.
Touching the conductive parts could cause an operation failure or give damage to the module.
●Securely fix the module with the DIN rail or installation screws. Installation screws must be tightened
within the specified torque range.
A loose screw may cause a drop of the module, short circuit or malfunction.
Overtightening may damage the screw, resulting in a drop of the module or a short circuit.
●Completely connect each cable connector to each receptacle.
Incomplete connection may cause a malfunction due to poor contact.

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[Wiring Precautions]
CAUTION
●Be sure to shut off all phases of the external power supply used by the system before installation or
wiring.
Failure to do so may cause an electric shock, damage to the product and/or malfunctions.
●Attach the terminal cover to the product before energizing and operating the system after installation
or wiring.
Failure to do so may cause an electric shock.
●Be sure to ground the FG terminals and LG terminals to the protective ground conductor.
Failure to do so may result in malfunctions.

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[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.
●When wiring in the programmable controller, be sure that it is done correctly by checking the
product's rated voltage and the terminal layout.
Connecting a power supply that is different from the rating or incorrectly wiring the product could
result in fire or damage.
●Tighten the terminal screws with the specified torque.
If the terminal screws are loose, it could result in short circuits, fire, or erroneous operation.
Overtightening a terminal screw may damage the screw, resulting in a short circuit or malfunction.
●Be sure there are no foreign substances such as sawdust or wiring debris inside the module.
Such debris could cause fires, damage, or erroneous operation.
●Place the connection wires and cables in a duct or clamp them.
If not, dangling cables may swing or inadvertently be pulled, resulting in damage to the module and/
or cables or malfunctions due to poor cable connection.
●Do not install the control cable(s) together with the communication cable(s).
Doing so may cause malfunctions due to noise.
●When disconnecting a communication or power cable from the module, do not pull it by holding the
cable part.
For a cable with connector, hold the connector and disconnect it from the module.
For a cable without connector, loosen the connector screw and disconnect the cable.
Pulling the cable that is still connected to the module may damage the module and/or cable and
cause malfunctions due to poor cable connection.
●Make sure that the interface type is correct before connecting the cable.
Do not connect a cable to a module that has different interface specification.
Doing so will cause a module failure.
●Using a tool specified by the manufacturer, correctly press, crimp, or solder the wires of the
connector and securely connect the connector to the module.
Failure to do so may result in a malfunction or failure of the module.

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[Startup·Maintenance Precautions]
CAUTION
●Before performing online operations (especially, program modification, forced output or operating
status change) through connection between a running CPU module and a peripheral, read this
manual carefully and ensure the safety.
An improper operation will cause mechanical damage or accidents.
●Do not touch terminals while the power is ON.
Doing so may cause an electric shock.
●Be sure to shut off all phases of the external power supply used by the system before cleaning or
retightening the terminal screw or module fixing screw.
Failure to do so may result in a failure or malfunction of the module.
A loose screw may cause a drop of the module, short circuit or malfunction.
Overtightening may damage the screw and/or module, resulting in a drop of the module, a short
circuit or malfunctions.
●Do not touch any connector under the cover on the front of the module.
Doing so may result in a failure or malfunction of the module.
●Do not disassemble or remodel the module.
Doing so may cause a failure, malfunctions, personal injuries and/or a fire.
●Do not drop or apply a strong shock to the module since the case is made of resin.
Doing so will damage the module.
●Be sure to shut off all phases of the external power supply before mounting or removing the module
to/from the panel.
Failure to do so may result in a failure or malfunction of the module.
●Do not install/remove the terminal block more than 50 times after the first use of the product.
(IEC 61131-2 compliant)
●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.
●Do not change the switch settings while the power is ON.
Doing so may cause a failure or malfunctions.
●The terminal cover must be closed all the time, except during installation, wiring or operation check.
If the cover remains open, it may cause damage to the module, a short circuit due to cable
connection failure, or malfunctions.

A- 6
[Disposal Precautions]
CAUTION
●When disposing of this product, treat it as industrial waste.

A- 7
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.

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REVISIONS
* The manual number is given on the bottom left of the back cover.
Japanese Manual Version SH-080686-E
2007 MITSUBISHI ELECTRIC CORPORATION
Print Date * Manual Number Revision
Jul., 2007 SH(NA)-080687ENG-A First edition
Sep., 2008 SH(NA)-080687ENG-B
SAFETY PRECAUTIONS, ABOUT MANUALS, Compliance with the EMC and
Low Voltage Directives, GENERIC TERMS AND ABBREVIATIONS, Section 2.2,
2.3, 3.2, 3.5.1, 4.2.1, 5.1.1, 5.2, 6.1.3, 6.2.3
Section 2.4
Oct., 2014 SH(NA)-080687ENG-C
SAFETY PRECAUTIONS, Related manuals, Compliance with the EMC and Low
Voltage Directives, HOW TO USE MANUALS, GENERIC TERMS AND
ABBREVIATION, DEFINITIONS OF TERMINOLOGY, Chapter 1, Section 1.1,
2.1 to 2.3, 3.1 to 3.4, 3.5.1, 3.7.1, 3.7.3, 4.1, 4.2, 4.2.1, 5.1.1, 5.2, 5.4, Chapter 6,
Section 6.1, Chapter 7, Section 7.1, Appendix 1.1, 1.2
Section 2.5, 6.1, Appendix 3
Section 6.1→6.2, Section 6.2→6.3
Jan., 2020 SH(NA)-080687ENG-D
Section 5.2, 7.1
This manual confers no industrial property rights or any rights of any other kinds, nor does it confer any patent licenses.
Mitsubishi Electric Corporation cannot be held responsible for any problems involving industrial property rights which may
occur as a result of using the contents noted in this manual.
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