Rockwell Automation 1746-HSCE High-Speed Counter Module Installation Instructions - Manual (Page 17)

High-Speed Counter Module 17
Publication 1746-IN011C-EN-P - April 2005
Single-Ended Encoder Wiring (Sourcing)
Single-Ended Encoder Output Waveforms (Sourcing)
The figure below shows the single-ended encoder output waveforms. When the
waveform is low, the encoder output transistor is OFF.
VS Value R Value Maximum Output Leakage
+5V dc no resistor needed 100 µA
+12V dc 1800 ohm 1/4W 5% 100 µA
+24V dc 4700 ohm 1/4W 5% 100 µA
R
R
A
Z
A(+)
A(-)
B(+)
B(-)
Z(+)
Z(-)
B
1 2 34
R
+ VDC
COM
VS
GND
Belden 9503 or equivalent
305m (1000tft) max length
Power
Supply
Shield (2)
Module Inputs
SW1
ON
OFF
(All switches OFF)
cable (1)
single ended
encoder
(4)
(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
(3) The 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.
(4) The Allen-Bradley 845H sourcing encoder is not compatible with this module.
(3)
(3)
(3)
Earth
A
B
Z
low = transistor OFF
high = transistor ON