Safety Precautions - Mitsubishi Electric MELSEC Q Series User Manual

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
CAUTION
Under some circumstances, failure to observe the precautions given under "
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]
● When connecting a peripheral with the programmable controller CPU or connecting a personal
computer with an intelligent function module to modify data of a running programmable controller,
configure an interlock circuit in the sequence 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" in the buffer memory of 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 these operations may cause malfunctions to the programmable controller system.
● Provide security measures on user side that prevent unauthorized access from outside via network
as necessary.

SAFETY PRECAUTIONS

(Read these precautions before using this product.)
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.
WARNING
WARNING" and " CAUTION".
CAUTION" may lead to
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