240
Wiring Section 5-3
Grounding
The diagram below shows the location of the ground and line ground termi-
nals.
• To help prevent electrical shock, ground the ground terminal (GR: ) with
a ground resistance of less than 100
Ω using a 14-gauge wire (minimum
cross-sectional area of 2 mm
2
).
• The line ground terminal (LG: ) is a noise-filtered neutral terminal. If
noise is a significant source of errors or electrical shocks are a problem,
connect the line ground terminal to the ground terminal and ground both
with a ground resistance of less than 100
Ω.
• The ground wire should not be more than 20 m long.
• The following grounding configurations are acceptable.
• 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).
LG (Noise-filter neutral terminal)
Ground this terminal to less than
100
Ω to improve noise resistance
and prevent electric shock.
GR (Ground terminal)
Ground this terminal to less than
100
Ω to prevent electric shock.
POWER
PA205R
DC24V
AC240V
OUTPUT
RUN
INPUT
AC100-240V
L2/N
L1
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
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