3
[Wiring Precautions]
CAUTION
● Individually ground the FG terminal of the programmable controller with a ground resistance of 100
ohms or less. Failure to do so may result in electric shock or malfunction.
● Tighten any unused terminal screws within the specified torque range. Undertightening can cause a
short circuit due to contact with a solderless terminal.
● Use applicable solderless terminals and tighten them within the specified torque range. If any spade
solderless terminal is used, it may be disconnected when a terminal block screw comes loose,
resulting in failure.
● Before wiring to the module or to loads, check the rated voltage and terminal layout of the module,
and connect the cables correctly. Connecting a power supply with a different voltage rating or
incorrect wiring may cause a fire or failure.
● Tighten the terminal block screws within the specified torque range. Undertightening can cause short
circuit, fire, or malfunction. Overtightening can damage the screw and/or module, resulting in drop,
short circuit, fire, or malfunction.
● Prevent foreign matter such as dust or wire chips from entering the module. Such foreign matter can
cause a fire, failure, or malfunction.
● Place the cables in a duct or clamp them. If not, dangling cables may swing or inadvertently be pulled,
resulting in malfunction or damage to modules or cables.
In addition, the weight of the cables may put stress on modules in an environment of strong vibrations
and shocks.
● Do not install the control lines or communication cables together with the main circuit lines or power
cables. Keep a distance of 100mm or more between them. Failure to do so may result in malfunction
due to noise.
● When disconnecting the cable from the module, do not pull the cable by the cable part. For the cable
with connector, hold the connector part of the cable. For the cable connected to the terminal block,
loosen the terminal screw. Pulling the cable connected to the module may result in malfunction or
damage to the module or cable.
● When an overcurrent caused by an error of an external device or a failure of the programmable
controller flows for a long time, it may cause smoke and fire. To prevent this, configure an external
safety circuit, such as a fuse.
● Mitsubishi programmable controllers must be installed in control panels. Wiring and replacement of a
module must be performed by qualified maintenance personnel with knowledge of protection against
electric shock. For wiring methods, refer to "INSTALLATION AND WIRING" in this manual.
● When attaching waterproof caps to the waterproof/dustproof module, tighten the caps within the
specified torque range. Undertightening can cause short circuit, fire, or malfunction. Overtightening
can damage the cap, resulting in short circuit or malfunction.
● For the waterproof/dustproof module, periodically check the connectors (such as I/O connectors,
communication connectors, and power supply connectors) and the screws of indicator cover.
Retighten any connectors and screws that are loose.
● The waterproof/dustproof module is compliant with IP67 only when all necessary waterproof
connectors and caps have been installed and the indicator cover has been properly tightened with
screws.
● For the waterproof/dustproof module, do not remove the gasket from the indicator cover to keep
waterproofing of the cover.
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