Mitsubishi Electric Melsec Q Series User Manual page 6

[Wiring Precautions]
Be sure to shut off all phases of the external power supply used by the system before wiring
PROFIBUS cables.
Failure to do so may cause the module to fail 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.
Be sure to place the PROFIBUS 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.
When disconnecting the PROFIBUS cable, do not pull it by holding the cable part.
Be sure to hold its connector which is plugged into the module.
Pulling the cable with it connected to the module may damage the module and/or cable, or cause
malfunctions due to poor contact of the cable.
A protective film is attached to the top of the module to prevent foreign matter, such as wire chips,
from entering the module during wiring.
Do not remove the film during wiring.
Remove it for heat dissipation before system operation.
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WARNING
CAUTION