Noise From External Wiring - Omron CP1L-EL20DR-D Operation Manual

Wiring CP1L-EL/EM CPU Units
Noise from External
Wiring
88
Take the following points into account when externally wiring I/O, power sup-
ply, and power lines.
• When multi-conductor signal cable is being used, avoid combining I/O
wires and other control wires in the same cable.
• If wiring racks are parallel, allow at least 300 mm between them.
PLC I/O wiring
PLC power supply
cable and general
control circuit wiring
Power lines
• If the I/O wiring and power cables must be placed in the same duct, they
must be shielded from each other using grounded steel sheet metal.
PLC power
supply cable
and general
control circuit
wiring
PLC I/O wiring
Ground to 100 Ω or less
Low-current cables
300 mm min.
Control cables
300 mm min.
Power cables
Ground to 100 Ω or less
Power lines
Steel sheet metal
200 mm min.
Section 3-4