Omron ZEN Operation Manual page 67

Wiring
Connecting 2-Wire AC Sensors
Two-wire
sensor
Note
A two-wire sensor cannot be connected directly to the AC input. To
connect a two-wire sensor, attach an external bleeder resistance in
the way shown below.
• Example: Connecting to a CPU Unit or Expansion I/O Unit
I0 to I5
R
a) Use a resistance that satisfies both of the following
conditions.
R1 ( Ω ) ≤
R2 ( Ω ) ≤
b) Because of heat generation, use a resistor with at least the
following wattage.
P (W) ≥
Calculating the Bleeder Resistance
when Connecting an OMRON E2E-
X10Y 2-Wire AC Sensor
This calculations in this example
are based on an input voltage of
85 to 110 V AC.
The following values are from the
Sensor datasheet.
The Sensor's maximum leakage
current is 1.7 mA.
The minimum current when the
Sensor's OFF residual voltage is
L
N
Max. OFF-voltage for AC input (25 VAC)
Sensor's max. leakage current (A)
Voltage supplied to sensor (V)
Min. current for which the
sensor's OFF residual voltage is
less than 25 V (A)
( Voltage supplied
2
to sensor)
Resistance value
Section 2-2
Internal
circuit
× 3 (allowance factor)
E2E-X@Y@
Output residual voltage
Load residual
voltage
At 100 V AC
ON
100 VAC
OFF
Load current (mA)
43