Safety Precautions - Mitsubishi Electric Q Series Reference 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 CPU module user's manual.
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]
• Make sure to see this manual for information about each station's operating status when a
communication error occurs in the network. Erroneous outputs and malfunctions may result in
serious accidents.
• If a coaxial cable is disconnected, this may destabilize the line, and a data link communication
error may occur in multiple stations. Make sure to create an interlock circuit in the sequence
program so that the system will operate safely even if the above error occurs. Failure to do so
may result in a serous accident due to faulty output or malfunctions.
• When performing control operations to a programmable controller (modifying data) in operation
by connecting GX Developer to the CPU module or connecting personal computers to the
intelligent functional modules, configure an interlocking circuit in a sequence program so that the
safety of the overall system is maintained. Also, before performing other control operations
(program modifications and operating status modifications (status control)) on the
programmable controller in operation, be sure to read the manual thoroughly and confirm the
safety. Especially if the above mentioned control operations are performed from an external
device to a remote programmable controller, problems arising on the programmable controller
side may not be dealt with immediately due to abnormal data communication. Thus, in addition
to configuring an interlocking circuit in a sequence program, determine how the system should
handle data communication errors between the programmable controller CPU and external
devices.
• Do not bundle the control wires and communication cables with the main circuit or power wires,
or install them close to each other. They should be installed at least 100 mm (3.94 in.) away
from each other. Failure to do so may generate noise that may cause malfunctions.
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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
!
CAUTION
!
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