Omron ZEN Operation Manual page 60

Wiring
Two-wire
sensor
Two-wire
sensor
• Example: Connecting to a CPU Unit
I0 to I5
R
• Example: Connecting to an Expansion I/O Unit
IN
R
COM
a) Use a resistance that satisfies both of the following condi-
tions.
Max. OFF-voltage for AC input (25 VAC)
R ( Ω ) ≤
Sensor's max. leakage current
Voltage supplied to sensor
R ( Ω ) ≤
Min. current for which the
sensor's OFF residual voltage is
less than 25 V
b) Because of heat generation, use a resistor with at least the
following wattage.
( Voltage supplied
to sensor)
P (W) ≥
Resistance value
L
330k 300k
51k
N
83k
4.7k
2
Section 2-2
Internal
circuit
Internal
circuit
× 3 (allowance factor)
37