Rockwell Automation 1746-HSCE,D17466.5 High-Speed Counter Module - Manual (Page 55)

Publication 1746-UM006B-EN-P - August 2005
Installation and Wiring 3-11
Differential Encoder Wiring 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.
Differential Encoder Output Waveforms
The illustration below shows the different encoder output waveforms.
If your encoder matches these waveforms, the encoder signals can be
directly connected to the associated screw terminals on the module.
For example, the A lead from the encoder is connected to the
module's A+ screw. If your encoder does not match these waveforms,
some wiring modifications may be necessary. Refer to Appendix C for
a description of these modifications.
Allen-Bradley
845H Series
differential encoder
A
A
B
B
Z
Z
Belden 9503 or equivalent
305m (1000ft) max length
A(+)
A(–)
B(+)
B(–)
Z(+)
Z(–)
Shield
Module Inputs
GND
VS Power
Supply
cable
+VDC
COM
SW1
1 2 3 4
ON
OFF
encoder connector
housing
Earth
(All switches in OFF position)
A
A
B
B
Z
Z