Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 191)

Section 4B
Connecting the 3-axis Servo Module
4B-45
Figure 4B.36 shows an incremental feedback device equivalent circuit for
feedback channel A.
Figure 4B.36
Incremental Feedback Device Equivalent Circuit
Differential
Line Driver
Customer
Encoder
+5V
+5V
768 W
768 W
221 W
0.01u f
A
A
Ch A HI
Ch A LO
Termination Panel
+
--
Analog Servo Module
8500-TPC
Cable
11306-I
Wiring Position Feedback
Feedback devices used with the control must be configurable such that the
marker Z is true at the same time that channels A & B are true. If you are
using an Allen-Bradley 845H encoder this requirement will already be met
if you wire them as shown in the cable diagrams on page 7A-53.
If you are using an encoder type feedback device other than the
Allen-Bradley 845H encoder, then use the following wiring procedure:
1. Obtain the encoder output timing diagram from the vendor’s data
sheets. A typical one is provided in Figure 4B.37 as an example.
4B.8.1
Wiring an Incremental
Feedback Device