Rockwell Automation 1746-HSCE,D17466.5 High-Speed Counter Module - Manual (Page 57)

Publication 1746-UM006B-EN-P - August 2005
Installation and Wiring 3-13
Single-Ended Encoder
Wiring (Sourcing) Refer to your encoder manual for the proper cable type and length.
(The Allen-Bradley 845H sourcing encoder is not compatible with this
module.)
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 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 module 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 OFF.
R
R
single ended
encoder
A
Z
Belden 9503 or equivalent
305m (1000ft) max length
A(+)
A(–)
B(+)
B(–)
Z(+)
Z(–)
Module Inputs
GND
VS
Power
Supply
+VDC
COM
B B
1 2 3 4
ON
OFF
SW1
cable
shield
R
(All switches in OFF position)
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
A
B
Z
low = transistor OFF
high = transistor ON