I have some 2-wire sensors that I need to plug into a PLC (Opto22 UltimateI/O). Apparently the leakage current on the sensors is too much for the PLC to deal with so I need to calculate a bleeder resistor value. I thought I did it correctly but it's not doing the job. Here are the specs:
Sensor:
1 mA leakage current
PLC input:
24VDC source
15k input resistance
10VDC minimum turn-on voltage
3VDC maximum turn-off voltage
Based on some formulas I came across on the web (buried in an Omron spec sheet) I came up with a bleeder resistor value of 30k or less. This is based on the following formula (from the spec sheet):
R