Safety Precautions - Mitsubishi MELSEC Q Series User Manual

Before using this product, please read this manual 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".
!
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 store this manual in a safe place and make it accessible when required. Always forward it to the
end user.
[DESIGN PRECAUTIONS]
• Do not write data into the "system area" of the buffer memory of intelligent function modules.
Writing data into the "system area" may cause a programmable controller system malfunction.
• Depending on the malfunction of the external output transistor, there may be cases where the
output is ON or OFF status. Install external monitoring circuitry for output signals that may lead
to major accidents.
• Do not bunch the control wires or communication cables with the main circuit or power wires, or
install them close to each other.
They should be installed 150 mm (5.9 inch) or more from each other.
Not doing so could result in noise that may cause malfunction.
A - 1
• 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
!
A - 1