Mitsubishi MELSEC-Q Series User Manual page 7

[Wiring Precautions]
CAUTION
Be sure to ground the FG and LG terminals to the protective ground conductor.
Not doing so could result in an electric shock or erroneous operation.
Prevent foreign matter such as dust or wiring debris from entering the module.
Failure to do so could cause fires, damage, or erroneous operation.
When wiring, check the rated voltage and terminal layout.
Connecting a power supply of a different voltage rating or incorrect wiring may result in a fire or
failure.
Connect the Ethernet and/or RS-232 cables to the corresponding connectors of the C Controller
module properly.
Tighten the terminal screws with the specified torque.
If the terminal screws are loose, it could result in short circuits, fire, or erroneous operation.
Tightening them too much may cause drop due to damages to the screws and/or the module,
resulting in fallout, short circuits or malfunction.
Be sure to place the communication and power cables into a duct or fasten them using clamps.
Failure to do so may damage the module or cables by pulling a dangling cable inadvertently or cause
the module to malfunction due to poor contact.
When disconnecting the communication and power cables from the module, do not pull a cable part
by hand.
For a cable with connectors, hold the connector by hand and disconnect it from the module.
Loosen screws on the part connected to the module before disconnecting a cable.
Pulling a cable that is still connected to the module may cause a malfunction or damage the module
or the cable.
Do not connect the outputs of multiple power supply modules in parallel.
Doing so can heat the power supply modules, causing fires or failures.
Crimp, pressure weld, or solder external connectors properly with the tools specified by the maker.
For crimping/pressure welding tools, refer to the user's manual for the I/O module.
Incomplete connection may cause a short circuit, fire or failure.
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