Omron NXR Series User Manual page 128

Appendices
Two-wire sensor
Relation between OFF Current of the IO-Link I/O Hubs and Sensor
Leakage Current
The IO-Link I/O Hubs cannot detect sensor output OFF without the following conditions met:
I ≥ I
OFF leak
I : OFF current to the input of the IO-Link I/O Hub
OFF
I : Sensor leakage current
leak
When I is greater than I
leak
The bleeder resistor constant can be calculated as follows:
Select an appropriate bleeder resistor R so that both equations can be satisfied.
R ≤ (V / I
OFF OFF
Rated power W of bleeder resistor ≥ (V
V : OFF voltage at the input of the IO-Link I/O Hub
OFF
A-4
1
V V
R CC
R
, connect a bleeder resistor R.
OFF
) × V / (I × (V / I
OFF leak OFF
CC
2
I/O connector
3
4
) - V )
OFF OFF
2
- V ) / R × 4 [allowable margin]
R
NXR-series IO-Link I/O Hub User's Manual (W620)