24 CompactLogix Packaged Controllers
Publication 1769-IN082A-EN-P - July 2008
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 Ω
12V DC 1382 Ω
24V DC 3147 Ω
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
-------------------------------------------=
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