Omron GRT1 - 11-2007 Operation Manual page 359

Precautions When Connecting Two-wire DC Sensors
Relationship between a DC Input-type Communications Unit's
OFF Current and a Sensor's Leakage Current
≥ I
I
OFF leak
I : OFF current of a Communications Unit with DC Inputs
OUT
I : Sensor's leakage current
leak
Connect a bleeder resistor if I
The bleeder resistor constant can be calculated using the following equation.
R ≤ (I × R
+ V )/(I
OFF IN F leak
2
Power W ≥ (V − V /R × 4 [allowable margin]
)
CC R
338
is greater than I
leak OFF
− V
)
OFF
.
Appendix E