Mitsubishi Electric Melsec WS Series User Manual page 6

[Wiring Precautions]

Switch the entire machine/system off line.
The system could start up unexpectedly while you are connecting the devices.
 Connectors for external devices must be crimped or pressed with the tool specified by the manufacturer,
or must be correctly soldered. Incomplete connections could result in short circuit, fire, or malfunction.

Connect the connectors to the module securely.
Failure to do so may cause malfunction due to poor contact.

Place the cables in a duct or clamp them.
If not, dangling cable may swing or inadvertently be pulled, resulting in damage to the module or cables
or malfunction due to poor contact.

Tighten the terminal screw within the specified torque range.
Undertightening can cause short circuit or malfunction.
Overtightening can damage the screw and/or module, resulting in drop, short circuit, or malfunction.

When disconnecting the cable from the module, do not pull the cable by the cable part.
When disconnecting the cable with connector from the module, hold the connector part.
When disconnecting the cable connected to a terminal block, loosen the terminal screws first.
Failure to do so may result in damage to the module or cable 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.
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CAUTION