Mitsubishi MELSEC-Q Series User Manual page 8

[Startup and Maintenance Precautions]
Do not touch the terminals while power is on.
Doing so may cause an electric shock.
Correctly connect the battery.
Also, do not charge, disassemble, heat, place in fire, short circuit, or solder the battery.
Mishandling of the battery can cause overheating or cracks which could result in injury and/or fires.
Be sure to shut off all phases of the external power supply before retightening the terminal screws
and module fixing screws or cleaning.
Failure to do so may result in an electric shock.
If a terminal screw is loose, it may cause a short circuit or malfunction.
If too tight, it may cause damage to the screws and/or module, resulting in an accidental drop of the
module, short circuit or malfunctions.
When controlling a running C Controller module (data modification) by connecting a personal
computer to the C Controller module, create an interlock circuit on user programs so that the whole
system functions safely all the time.
This must be also done when performing any other controls (e.g. operating status change (status
control)) or operations instructed from the computer.
In these controls, especially the one performed from an external device to a C Controller module in a
remote location, some C Controller side problem may not be resolved immediately due to failure of
data communications.
To prevent this, create an interlock circuit on user programs and establish corrective
procedures for communication failure between the external device and the C Controller module.
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