Rockwell Automation 1746-HSCE High-Speed Counter Module Installation Instructions - Manual (Page 16)

16 High-Speed Counter Module
Publication 1746-IN011C-EN-P - April 2005
Single-Ended Encoder Wiring (Open Collector)
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.
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
A(+)
A(-)
B(+)
B(-)
Z(+)
Z(-)
R
1 2 34
+ VDC
COM
VS
GND
Belden 9503 or equivalent
305m (1000tft) max length
Power
Supply
Allen-Bradley
845H Series
single-ended
encoder
encoder connector housing
Earth
Shield (2)
Module Inputs
SW1
ON
OFF
(All switches OFF)
cable (1)
(1) Refer to your encoder manual for proper cable type and length.
(2) 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.
(3) The pullup 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.
(3)
A
B
Z
low = transistor ON
high = transistor OFF