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Wiring Section 5-3
• The CJ-series PLCs are designed to be mounted so that they are isolated
(separated) from the mounting surface to protect them from the effects of
noise in the installation environment (e.g., the control panel).
• Do not share a ground line with other equipment.
• Do not share the PLC’s ground with other equipment or ground the PLC
to the metal structure of a building. The configuration shown in the follow-
ing diagram may worsen operation.
GR terminal
on CPU Rack
GR terminal
on Expansion
Rack 1
GR terminal
on Expansion
Rack 2
GR terminal
on Expansion
Rack 3
Do not ground multiple
control panels separately,
but connect the GR
terminals of each Rack and
ground to a resistance of
less than 100
Ω.
Control panel 1
Control panel 2
GR crossover
CJ-series PC Other equipment
Ground
(100
Ω or less)
Ground
(100 Ω or less)
CJ-series PC
Other equipment
Ground
(100
Ω or less)
Ground
(100
Ω or less)
CJ-series PC Other equipment
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