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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.

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 a CC-Link Safety error, it turns off all the outputs.

Note that the outputs in a sequence program are not automatically turned off.

If a 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.

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 erroneous operation.

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