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Wiring CP1L CPU Units Section 3-4
Noise from External
Wiring
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.
• 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.
Surge Suppressor Specifications
Resistance: 50 Ω
Capacitance: 0.47µF
Voltage: 200 V
Diode Specifications
Breakdown voltage: 3 times load voltage min.
Mean rectification current: 1 A
300 mm min.
300 mm min.
PLC I/O wiring
PLC power supply
cable and general
control circuit wiring
Power lines
Low-current cables
Control cables
Power cables
Ground to 100
Ω or less
200 mm min.
PLC I/O wiring
PLC power
supply cable
and general
control circuit
wiring
Power lines
Steel sheet metal
Ground to 100
Ω or less
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