Mitsubishi Electric Melsec-Q172DCPU User Manual page 230

7 EMC DIRECTIVES
(2) In wiring inside the panel, the power line connected to the power or servo amplifier
and the communication cable such as bus connection cable or network cable
must not be mixed. If the cables are installed closely with each other for wiring
reasons, using a separator (made of metal) can make the cables less influenced
by noise.
Mixing the power line and communication cable may cause malfunction due to
noise.
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