Rockwell Automation 1746-HSCE High-Speed Counter Module Installation Instructions - Manual (Page 15)

High-Speed Counter Module 15
Publication 1746-IN011C-EN-P - April 2005
Encoders
The wiring diagrams on the following pages are provided to support the
Allen-Bradley encoders you may already have. Differential encoders provide the
best immunity to electrical noise.
Differential Encoder Wiring
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 the
High-Speed Counter Module User Manual, publication 1746-6.5 for a description of
these modifications.
A
A
B
B
Z
Z
A(+)
A(-)
B(+)
B(-)
Z(+)
Z(-)
1 2 3 4
+ V D C
COM
VS
GND
cable (1)
Belden 9503 or equivalent
305m (1000ft) max length
Power
Supply
Allen-Bradley
845H Series
differential
encoder
encoder connector
Earth
Shield
(2)
Module Inputs
SW1
ON
OFF
(all switches
(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.
A
A
B
B
Z
Z