Omron CJ - 09-2009 Operation Manual page 307

Wiring
• 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).
Control panel 1
GR terminal
on CPU Rack
GR terminal
on Expansion
Rack 1
• Do not share a ground line with other equipment.
CJ-series PC
CJ-series PC
• 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.
CJ-series PC
Control panel 2
GR crossover
Other equipment
Ground Ground
(100 Ω or less) (100 Ω or less)
Other equipment
Ground
Ground
(100 Ω or less) (100 Ω or less)
Other equipment
Section 5-3
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.
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