Appendices
A-138
CJ2 CPU Unit Hardware User’s Manual
Take the following points into account when externally wiring communications cables.
• When multi-conductor signal cable is being used, do not combine 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 plates.
Noise Countermeasures for External Wiring
Communications cables
SYSMAC power supply
lines and general
control circuit lines
Power lines
Low-power cables
Control cables
Power cables
300 mm min.
300 mm min.
Ground to less than 100 Ω
200 mm min.
Communications
cables
Power lines
Steel sheet metal plates
Ground to less than 100 Ω
SYSMAC power supply
lines and general control
circuit lines
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