Rockwell Automation 1746-HSCE,D17466.5 High-Speed Counter Module - Manual (Page 56)

Publication 1746-UM006B-EN-P - August 2005
3-12 Installation and Wiring
Single-Ended Encoder
Wiring (Open Collector) Refer to your encoder manual for the proper cable type and length.
Due to the topology of the module’s input circuits, terminating the
shield at the encoder end provides the highest immunity to EMI
interference. Connect EARTH ground directly to the encoder
connector housing.
The pull-up resistor (R) value depends on the power supply value
(VS). The table below lists the resistor values for typical power supply
values. These resistors must be located at the encoder end of the
cable.
Single-Ended Encoder Output Waveforms
The figure below shows the single-ended encoder output waveforms.
When the waveform is low, the encoder output transistor is ON.
Allen-Bradley
845H Series
single-ended
encoder
A
B
Z
Belden 9503 or equivalent
305m (1000ft) max length
A(+)
A(–)
B(+)
B(–)
Z(+)
Z(–)
Module Inputs
GND
VS
Power
Supply
+VDC
COM
R
1 2 3 4
ON
OFF
SW1
encoder connector
housing
Earth
cable
Shield
(All switches in OFF position)
VS Value R Value Maximum Output Leakage
+5V dc 150 ohm 1/4W 5% 6.3 mA
+12V dc 1800 ohm 1/4W 5% 1.5 mA
+24V dc 4700 ohm 1/4W 5% 1.2 mA
A
B
Z
low = transistor ON
high = transistor OFF