Safety Precautions - Mitsubishi MELSEC-Q Series User Manual

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. For the safety instructions of the
programmable controller system, please read the user's manual for the CPU module to use.
In this manual, the safety instructions are ranked as "DANGER" and "CAUTION".
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DANGER
CAUTION
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Note that the CAUTION level may lead to a serious consequence according to the circumstances.
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Always follow the instructions of both levels because they are important to personal safety.
Please store this manual in a safe place and make it accessible when required. Always forward it to the
end user.
[Design Precautions]
• For the operating status of each station after a communication failure, refer to relevant manuals
for the network. Erroneous outputs and malfunctions may lead to accidents.
Not doing so can cause an accident due to false output or malfunction.
• To prevent the malfunction of the programmable controller system due to harmful e-mails, take
preventive measures (such as antivirus measures) so that the mail server for this module does
not receive harmful e-mails.
• To maintain the safety of the programmable controller system against unauthorized access from
external devices via the Internet, take appropriate measures.
• When changing data of the running programmable controller from a peripheral connected to the
CPU module or from a personal computer connected to an intelligent function module or special
function module, configure an interlock circuit in the sequence program to ensure that the entire
system will always operate safely. For program modification and operating status change, read
relevant manuals carefully and ensure the safety before operation.
Especially in the above mentioned control operations that are performed from an external device
to a remote programmable controller, any problems on the programmable controller side may
not be dealt with promptly due to abnormal data communication. To prevent this, configure an
interlock circuit in the sequence program, and determine corrective actions to be taken between
the external device and CPU module in case of a communication failure.
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• SAFETY PRECAUTIONS •
(Always read before starting use.)
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.
DANGER
!
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