Omron ZEN Operation Manual page 72

Wiring
Connecting Input Devices to the CPU Unit
Device
Relay output
NPN open collector
NPN current output
PNP current output
Voltage output
Note
■
48
The following table shows how to connect various input devices.
+
Output
0 V
+
Constant
Output
current
circuit
0 V
Use the same power supply for the input and sensor.
+
Output
0 V
+
Output
0 V
Do not use the following wiring with voltage-output devices:
+
Output
0 V
Leakage Current from Input Devices
A leakage current can cause false inputs when using 2-wire DC
sensors (proximity switches or photoelectric switches) or limit
switches with LEDs. False inputs won't occur if the leakage current is
Circuit diagram
Sensor
power supply
Section 2-2
+
IN
ZEN
COM
−
+
IN
ZEN
COM
−
+
IN
ZEN
COM
−
+
IN
ZEN
COM
−
+
IN
ZEN
COM
−
+
IN
ZEN
COM (+)
−