Mitsubishi Electric MELSEC-QS Series User guide

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SAFETY PRECAUTIONS
(Always read these instructions before using this equipment.)
Before using the product, please read this manual, the relevant manuals introduced in this manual,
standard PLC manuals, and the safety standards carefully and pay full attention to safety to handle the
product correctly.
In this manual, the safety instructions are ranked as "DANGER" 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.
DANGER
CAUTION
Indicates that incorrect handling may cause hazardous conditions,
resulting in death or severe injury.
Indicates that incorrect handling may cause hazardous conditions,
resulting in medium or slight personal injury or physical damage.

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[Design Precautions]
DANGER
When a safety PLC detects an error in an external power supply or a failure in PLC main module, it
turns off all the outputs.
Create an external circuit to securely stop the power of hazard by turning off the outputs.
Incorrect configuration may result in an accident.
Create short current protection for a safety relay, and a protection circuit such as a fuse, and
breaker, outside a safety PLC.
If load current more than the rating or overcurrent due to a short circuit in the load has flowed in the
CC-Link Safety remote I/O module, the module defines it as a fault and turns off all the outputs.
However, if overcurrent flows in the CC-Link Safety remote I/O module for a long time, it may cause
smoke or a fire. To prevent it, create a safety circuit such as a fuse outside the module.
When data/program change, or status control is performed from a PC to a running safety PLC,
create an interlock circuit outside the sequence program and safety PLC to ensure that the whole
system always operates safely.
For the operations to a safety PLC, pay full attention to safety by reading the relevant manuals
carefully, and establishing the operating procedure.
Furthermore, for the online operations performed from a PC to a safety CPU module, the corrective
actions against a communication error due to a cable connection fault, etc. should be predetermined
as a system.
All output signals from a safety CPU module to the CC-Link Safety system master module are
prohibited to use.
These signals can be found in the CC-Link Safety System Master Module User's Manual.
Do not turn ON or OFF these signals by sequence program, since turning ON/OFF these output
signals of the PLC system may cause malfunctions and safety operation cannot be guaranteed.
When a safety remote I/O module has detected CC-Link Safety error, it turns off all the outputs. Note
that the outputs in a sequence program are not automatically turned off.
If CC-Link Safety error has been detected, create a sequence program that turns off the outputs in
the program.
If the CC-Link Safety is restored with the outputs on, it may suddenly operate and result in an
accident.
To inhibit restart without manual operation after safety functions was performed and outputs were
turned OFF, create an interlock program which uses a reset button for restart.

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[Design Precautions]
[Installation Precautions]
CAUTION
Do not bunch the wires of external devices or communication cables together with the main circuit or
power lines, 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 malfunctions.
Select the external devices to be connected to the CC-Link Safety remote I/O module, considering
the maximum inrush current with reference to the CC-Link Safety System Remote I/O Module User's
Manual.
CAUTION
Use a safety PLC in the environment that meets the general specifications described in the QSCPU
User's Manual (Hardware Design, Maintenance and Inspection).
Using this PLC 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.
While pressing the installation lever located at the bottom of module, insert the module fixing tab into
the fixing hole in the base unit until it stops. Then, securely mount the module with the fixing hole as
a supporting point.
Incorrect loading of the module can cause a failure or drop.
Secure the module to the base unit with screws.
Tighten the screw in the specified torque range.
If the screws are too loose, it may cause a drop of the screw or module.
Over tightening may cause a drop due to the damage of the screw or module.
Make sure to fix the CC-Link Safety remote I/O module with a DIN rail or mounting screws and
tighten the screws with the specified torque.
If the screws are too loose, it may cause a drop of the screw or module.
Over tightening may cause a drop due to the damage of the screw or module.
Completely turn off the external supply power used in the system before mounting or removing the
module.
Not doing so could result in damage to the product.
Do not directly touch the module's conductive parts or electronic components.
Doing so may cause malfunctions or a failure.

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[Wiring Precautions]
DANGER
Be sure to shut off all phases of the external supply power used by the system before wiring.
Not completely turning off all power could result in electric shock or damage to the product.
When energizing or operating the module after installation or wiring, be sure to close the attached
terminal cover.
Not doing so may result in electric shock.
CAUTION
Ground the FG and LG terminals correctly.
Not doing so could result in electric shock or malfunctions.
Use a solderless terminal with insulation sleeve for wiring of a terminal block.
Use up to two solderless terminals for a single terminal.
Use applicable solderless terminals and tighten them with the specified torque. If any solderless
spade terminal is used, it may be disconnected when the terminal screw comes loose, resulting in a
failure.
Wire the module correctly after confirming the rated voltage and terminal layout.
Connecting a power supply of a different rated voltage or incorrect wiring may cause a fire or failure.
Tighten a terminal block mounting screw, terminal screw, and module mounting screw within the
specified torque range.
If the terminal block mounting screw or terminal screw is too loose, it may cause a short circuit, fire,
or malfunctions.
If too tight, it may damage the screw and/or the module, resulting in a drop of the screw or module, a
short circuit or malfunctions.
If the module mounting screw is too loose, it may cause a drop of the screw or module.
Over tightening the screw may cause a drop due to the damage of the screw or module.
Be sure there are no foreign substances such as sawdust or wiring debris inside the module.
Such debris could cause a fire, failure, or malfunctions.
The module has an ingress prevention label on its top to prevent foreign matter, such as wire offcuts,
from entering the module during wiring.
Do not peel this label during wiring.
Before starting system operation, be sure to peel this label because of heat dissipation.

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[Wiring Precautions]
CAUTION
Be sure to fix the communication cables or power cables by ducts or clamps when connecting them
to the module.
Failure to do so may cause damage of the module or cables due to a wobble, unintentional shifting,
or accidental pull of the cables, or malfunctions due to poor contact of the cable.
When removing the connected communication cables or power cables, do not pull the cable with
grasping the cable part.
Remove the cable connected to the terminal block after loosening the terminal block screws.
Pulling the cable connected to a module may result in malfunctions or damage of the module or
cable.
For the cables to be used in the CC-Link Safety system, use the ones specified by the manufacturer.
Otherwise, the performance of the CC-Link Safety system is not guaranteed.
As to the maximum overall cable length and station - to station cable length, follow the specifications
described in the CC-Link Safety System Master Module User's Manual.
If not following the specification, the normal data transmission is not guaranteed.
Install our PLC in a control panel for use.
Wire the main power supply to the power supply module installed in a control panel through a
distribution terminal block.
Furthermore, the wiring and replacement of a power supply module have to be performed by a
maintenance worker who acquainted with shock protection.
(For the wiring methods, refer to the QSCPU User's Manual (Hardware Design, Maintenance and
Inspection).

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[Stratup and Maintenance precautions]
DANGER
Do not touch the terminals while power is on.
Doing so could could result in electric shock.
Correctly connect the battery.
Also, do not charge, disassemble, heat, place in fire, short circuit, or solder the battery.
Mishandling of battery can cause overheating, cracks, or ignition which could result in injury and
fires.
Turn off all phases of the external supply power used in the system when cleaning the module or
retightening the terminal block mounting screws, terminal screws, or module mounting screws.
Not doing so could result in electric shock.
Tighten a terminal block mounting screw, terminal screw, and module mounting screw within the
specified torque range.
If the terminal block mounting screw or terminal screw is too loose, it may cause a short circuit, fire,
or malfunctions.
If too tight, it may damage the screw and/or the module, resulting in a drop of the screw or module, a
short circuit or malfunctions.
If the module mounting screw is too loose, it may cause a drop of the screw or module.
Over tightening the screw may cause a drop due to the damage of the screw or module.
CAUTION
The online operations performed from a PC to a running safety PLC (Program change when a safety
CPU is RUN, device test, and operating status change such as RUN-STOP switching) have to be
executed after the manual has been carefully read and the safety has been ensured.
Following the operating procedure predetermined at designing, the operation has to be performed by
an instructed person.
When changing a program while a safety CPU is RUN (Write during RUN), it may cause a program
breakdown in some operating conditions.
Fully understand the precautions described in the GX Developer's manual before use.
Do not disassemble or modify the modules.
Doing so could cause a failure, malfunctions, injury, or fire.
If the product is repaired or remodeled by other than the specified FA centers or us, the warranty is
not covered.
Use any radio communication device such as a cellular phone or a PHS phone more than 25cm
(9.85 inch) away in all directions of safety PLC.
Not doing so can cause malfunctions.

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[Stratup and Maintenance precautions]
[Disposal Precautions]
[Transportation Precautions]
CAUTION
Completely turn off the external supply power used in the system before mounting or removing the
module.
Not doing so may result in a failure or malfunctions of the module.
Restrict the mounting/removal of a module, base unit, and terminal block up to 50 times
(IEC61131-2-compliant), after the first use of the product.
Failure to do so may cause the module to malfunction due to poor contact of connector.
Do not drop or give an impact to the battery mounted to the module.
Doing so may damage the battery, causing the battery fluid to leak inside the battery.
If the battery is dropped or given an impact, dispose of it without using.
Before touching the module, always touch grounded metal, etc. to discharge static electricity from
human body, etc.
Not doing so may result in a failure or malfunctions of the module.
Since the module case is made of resin, do not drop or apply any strong impact to the module.
Doing so may damage the module.
Completely turn off the external supply power used in the system before mounting or removing the
module to/from the panel.
Not doing so may result in a failure or malfunctions of the module.
CAUTION
When disposing of this product, treat it as industrial waste.
CAUTION
When transporting lithium batteries, make sure to treat them based on the transport regulations.
(For details of the controlled models, refer to the QSCPU User's Manual (Hardware).

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REVISIONS
The manual number is given on the bottom left of the back cover.
Japanese Manual Version SH-080611-C
2006 MITSUBISHI ELECTRIC CORPORATION
Print date Manual number Revision
Sep., 2006 SH(NA)-080613ENG-A First edition
Mar., 2007 SH(NA)-080613ENG-B
CHAPTER1, Section 4.2, 5.5, 5.6.3, 5.6.4
Apr., 2008 SH(NA)-080613ENG-C
Section 4.1, Appendix 1
This manual confers no industrial property rights or any rights of any other kind, nor does it confer any patent licenses.
Mitsubishi Electric Corporation cannot be held responsible for any problems involving industrial property rights which may
occur as a result of using the contents noted in this manual.
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