Mitsubishi MELSEC-QnA Series User Manual page 2

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".
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.
[INSTALLATION PRECAUTIONS]
Use the PLC in an environment that meets the general specificaitons
contained in CPU module user's manual. Using this PLC in an environment
outside the range of the general specifications could result in electric shock,
fire, erroneous operation, and damage to or deterioration of the product.
Fully insert the projection on the bottom of the module into the hole in the
base unit, press the module into position, and tighten the module fixing
screws.
Not installing the module correctly or not fixing it with the screws could result
in malfunction, damage, or drop of some pieces of the product.
Always tighten the module fixing screws within the specified torque range.
Loose tightening could result in drop of some pieces of the product,
short-circuit, and malfunction.
Tightening the screws too much could result in drop of some pieces of the
product, short-circuit, or malfunction due to the breakage of a screw or the
module.
Completely turn off the externally supplied power used in the system before
mounting or removing the module.
Not doing so could result in damage to the product.
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.
CAUTION
A-1