Omron CP1L - 12-2007, Operation Manual

Page: 136 / 673

103
Wiring CP1L CPU Units
Section 3-4
3-4-3 Wiring Safety and Noise Controls
I/O Signal Wiring
Whenever possible, place I/O signal lines and power lines in separate ducts or
conduits both inside and outside of the control panel.
If the I/O wiring and power wiring must be routed in the same duct, use
shielded cables and connect the shields to the GR terminal to reduce noise.
Inductive Loads
When an inductive load is connected to an I/O Unit, connect a surge suppres-
sor or diode in parallel with the load as shown below.
Note Use surge suppressors and diodes with the following specifications.
OUT
R
COM
L
+
OUT
R
COM
L
+
SYSMAC CP1L
SYSMAC CP1L
Example Method 1
Example Method 2
Use a dark current of approximately 1/3 the rated current of the incandescent lamp.
Install a limit resistance.
(1)
(2)
(1) (2)
(1) (2)
Suspended duct
In-floor duct
(1) = I/O cables
(2) = Power cables
Conduits
L
IN
COM
OUT
COM
OUT
COM
L
+
Diode
DC input Relay output
Surge suppressor
Relay output or
transistor output
Diode