Rockwell Automation 1769-L23E-QB1B_QBFC1B_QBFC1B CompactLogix Packaged Controller Installation Instructions - Manual (Page 25)

CompactLogix Controller 25
Rockwell Automation Publication 1769-IN082C-EN-P - February 2013
HSC Single-ended Encoder Wiring Diagram
(1) Refer to your encoder manual for proper cable type. The type of cable used should be twisted-pair, individually shielded cable with a maximum
length of 300 m (1000 ft.).
(2) External resistors are required if they are not internal to the encoder. 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, use this formula:
Where:
R = maximum pull-up resistor value
VDC = power supply voltage
Vmin = 2.6V DC
Imin = 6.8 mA
The minimum resistor (R) value depends on the current sinking capability of the encoder. Refer
to your encoder’s documentation for more information.
Power Supply Voltage (V DC) Maximum Pull-up Resistor Value (R)
(1)
(1) Resistance values may change, depending upon your application.
5V DC 352

12V DC 1382

24V DC 3147

A
B
Z
A1(+)
A1(–)
B1(+)
B1(–)
Z1(+)
Z1(–)
GND
VS +VDC
COM
R
(2)
Cable
(1)
Power
Supply
Allen-Bradley
845H Series
Single-ended
Encoder
Shield/housing
Connect only if housing is electronically
isolated from the motor and ground.
Shield
Inputs
Earth
R
V DC Vmin –  
Imin
-------------------------------------- =