Allen-Bradley CompactLogix 1769-L23E-QB1B Installation Instructions Manual page 26

26 CompactLogix Controller
HSC Discrete Device Wiring
Proximity Sensor
Photo-electric Sensor with Open
Collector Sinking Output
(1) External resistors are required if they are not internal to the sensor. The pull-up resistor (R) value depends on the power supply value. The table
below shows the maximum resistor values for typical supply voltages. To calculate the maximum resistor value, the following formula:
 DC 
V – Vmin
R = --------------------------------------
Imin
Where:
R = maximum pull-up resistor value
VDC = power supply voltage
Vmin = 2.6V DC
Imin = 6.8 mA
Power Supply Voltage (VDC)
5V DC
12V DC
24V DC
(1) Resistance values may change, depending upon your application.
The minimum resistor (R) value depends on the current sinking capability of the sensor. Refer to
your sensor's documentation for more information.
Rockwell Automation Publication 1769-IN082C-EN-P - February 2013
VS
OUT
COM
Solid-state
Switch
VS
(1)
R
OUT
COM
Maximum Pull-up Resistor Value (R)
352 
1382 
3147 
+VDC
Power
COM Supply
A1(+)
A1(–)
VS
OUT
B1(+)
COM
B1(–)
Z1(+)
Z1(–)
Module Inputs
(1)