Safety Precautions - Mitsubishi QJ71MB91 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 of the CPU module used.
In this manual, the safety instructions are ranked as "DANGER" and "CAUTION".
DANGER
CAUTION
Note that the CAUTION level may lead to a serious consequence according to the circumstances.
Always follow the instructions of both levels because they are important to personal safety.
Please save this manual to make it accessible when required and always forward it to the end user.
[DESIGN PRECAUTIONS]
For the operating status of each station in the case of a communication error, see the manual of each
station. Erroneous output or malfunction may cause an accident.
When controlling a running programmable controller (modifying data) by connecting peripheral
devices to the CPU module or connecting a personal computer to the intelligent function module,
configure an interlocking circuit in a sequence program so that the safety of the overall system is
always maintained. Also, before performing other control operations (program modifications and
operation status modifications (status control)) on the running programmable controller, be sure to
read the manual carefully and thoroughly confirm the safety.
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 faulty data communication. In addition to configuring an interlocking circuit
in a sequence program, determine how the system handles data communication errors between the
devices and the programmable controller CPU.
Do not write any data in the "system area (Use prohibited)" of the buffer memory of the intelligent
function module. Also, do not output (turn on) the "use prohibited" signal, which is one of the output
signals from the programmable controller CPU to the intelligent function module. If data is written to
the "system area (Use prohibited)" or the "use prohibited" signal is output, there is a risk that the
programmable controller system may malfunction.

SAFETY PRECAUTIONS

(Always read these instructions 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 medium or slight personal injury or physical damage.
DANGER
A
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