1
SAFETY PRECAUTIONS
(Read these precautions before using this product.)
Before using this product, please read this manual and the relevant manuals carefully and pay full attention
to safety to handle the product correctly.
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 manual and then keep the manual in a safe place for future
reference.
[Design Precautions]
WARNING
When the MELSEC-WS safety controller detects a fault in the external power supply or itself, it turns
off the outputs. Configure an external circuit so that the connected devices are powered off
according to the output status (off) of the MELSEC-WS safety controller. Incorrect configuration may
result in an accident.
When a load current exceeding the rated current or an overcurrent caused by a load short-circuit
flows for a long time, it may cause smoke and fire. To prevent this, configure an external safety
circuit, such as a fuse.
For safety relays, configure an external circuit using a device such as a fuse or breaker to protect a
short-circuit current.
When changing data and operating status, and modifying program of the running MELSEC-WS
safety controller from the PC, configure a safety circuit in the sequence program or external to the
MELSEC-WS safety controller to ensure that the entire system operates safely.
Before operating the MELSEC-WS safety controller, read the relevant manuals carefully and
determine the operating procedure so that the safety can be ensured.
Furthermore, before performing online operations for the MELSEC-WS safety controller from the
PC, determine corrective actions to be taken for communication errors caused by failure such as a
poor contact.
Create an interlock program using a reset button to prevent the MELSEC-WS safety controller from
restarting automatically after the safety function is activated and the safety controller turns off the
outputs.
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