Wiring For Safety And Noise Immunity - Omron CJ - 12-2004 Manual

Connections and Wiring
3-4-2

Wiring for Safety and Noise Immunity

R/W Head Cables and I/O
Signal Lines
Countermeasures for
Inductive Loads
Noise Countermeasures
for External Wiring
34
Wire the R/W Head cables and I/O signal lines in separate ducts from power
circuit cables both inside and outside the control panel.
(1)
(2)
Suspended ducts
If the same ducts must be used, shielded cables can be used to increase
resistance to noise. If a shielded cable is used, connect one end of the shield
to ground.
If I/O is connected to an inductive load, connect a surge killer or diode in par-
allel with the load.
Diode
L
Note Use surge killers and diodes that meet the following conditions:
Surge Killers
Diodes
Consider the following items when wiring external lines, such as the R/W
Head cables, I/O lines, power supply lines, and high-power lines.
• When using multiconductor cables for signal lines, do not use the same
cable for both I/O lines and other control lines.
(1)
Floor ducts
IN
Relay contact output
DC input
Triac output
COM
Relay contact output
Transistor output
Resistance: 50 Ω
Capacitance: 0.47 µF
Voltage: 200 V
Inrush withstand voltage: 3 times load voltage min.
Average rectified current: 1 A
Section 3-4
(1): I/O cables
(2): Power lines
(2)
(1)
Conduits
L
OUT
Surge killer
COM
OUT
Diode
COM
(2)
+