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.
Note that these precautions apply only to this product. Refer to the user's manual of the CPU module for
the programmable controller system safety precautions.
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]
• When controlling a running programmable controller (e.g. modifying data), establish an interlock
circuit in a sequence program for safety of the overall system.
Also, be sure to read the manual carefully and ensure safety before making controls such as
change of operation status.
Especially, when controlling a programmable controller from a remote location via the Internet,
problems on the programmable controller side may not be dealt with promptly due to abnormal
data communication.
Establish an interlock circuit in a sequence program.
• For the operation status of each station in the event of a communication error in the station, see
the manual for each station.
Failure to do so can cause an accident due to false output or malfunction.
• When the e-mail function is utilized, it may take time to send e-mail or is disabled depending on
the status of the send server, transmission path, receive server and/or receive device.
To ensure the safety of the programmable controller system, provide calling circuits using lamps
and buzzers.
• Provide a safety circuit outside the programmable controller so that safety of the whole system
can be ensured against an external power failure or programmable controller failure.
Failure to do so may cause an accident due to false output or malfunction.
• If it is necessary to ensure the security of the programmable controller system against
unauthorized and illegal access from external devices via the Internet, appropriate measures
(firewall, etc.) must be taken by the user.
A - 1

SAFETY PRECAUTIONS

(Always read these instructions before using this equipment.)
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 - 1