Omron CJ2 CPU UNIT User Manual page 181

Cj2 cpu unit hardware
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• Relation between current when the PLC is OFF and sensor leakage current:
≥ I
I
OFF
leak
Connect a bleeder resistor if I
bleeder resistance constant.
R ≤ (R
× V
IN
Power W ≥ (V
Two-wire sensor
V
:
CC
V
:
ON
V
:
OFF
I
:
ON
I
:
OFF
R
:
IN
• Precautions on Sensor Surge Current
An incorrect input may occur if a sensor is turned ON after the PLC has started up to the point
where inputs are possible. Determine the time required for sensor operation to stabilize after the
sensor is turned ON and take appropriate measures, such as inserting into the program a timer
delay after turning ON the sensor.
Example
In this example, the sensor's power supply voltage is used as the input to CIO 000000 and a 100-ms
timer delay (the time required for an OMRON Proximity Sensor to stabilize) is created in the pro-
gram. After the Completion Flag for the timer turns ON, the sensor input on CIO 000001 will cause
output bit CIO 000100 to turn ON.
000000
TIM0000 000001
CJ2 CPU Unit Hardware User's Manual
is greater than I
leak
× R
− V
)/(I
OFF
leak
IN
OFF )
− V
/R × 4 [allowable margin]
2
)
CC
R
V
R
R
V
CC
Power voltage
V
PLC ON voltage
I
PLC OFF voltage
I
PLC ON current
R:
PLC OFF current
PLC input impedance
TIM
0000
#0001
000100
. Use the following equation to calculate the
OFF
DC Input Unit
R
IN
:
Sensor output residual current
R
:
Sensor control current (load current)
OUT
:
Sensor leakage current
leak
Bleeder resistance
5 Installation
5
5-37

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