Wiring Safety And Noise Controls - Omron CP1L - 12-2007 Operation Manual

Wiring CP1L CPU Units
3-4-3

Wiring Safety and Noise Controls

I/O Signal Wiring
Inductive Loads
Example Method 1
SYSMAC CP1L
Use a dark current of approximately 1/3 the rated current of the incandescent lamp.
Example Method 2
SYSMAC CP1L
Install a limit resistance.
Whenever possible, place I/O signal lines and power lines in separate ducts or
conduits both inside and outside of the control panel.
(1)
(2)
Suspended duct
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.
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.
L
Note Use surge suppressors and diodes with the following specifications.
L
OUT
R
COM
R
L
OUT
COM
(1)
IN
Diode
DC input
Relay output
COM
Relay output or
transistor output
+
+
(2)
In-floor duct
L
OUT
Surge suppressor
COM
OUT
Diode
COM
Section 3-4
(1) = I/O cables
(2) = Power cables
(1) (2)
Conduits
+
103