Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 220)

Section 4C
Connecting the 4-axis Servo Module
4C-22
The 4 axis 9/260 and 9/290 servo cards support:
Feedback Device Additional hardware
Allen-Bradley 845H series differential encoders ----
Sony Magnascale model GF-45E Board-type detector model MD10-FR
Heidenhain Model 704 External interpolation and digitizing
model EXE602 D/5-F
Futaba Pulscale model FM45NY PCB interface Module model CZ0180
with cable PCB020EA
Other feedback devices can be compatible if they comply with the
specifications listed in Table 4B.L. Refer to the 9/Series CNC AMP
Reference Manual, publication 8520-6.4, for more information.
This manual is written under the assumption that your system is using the
Allen-Bradley 845H series differential encoder. If you are using some
other feedback device such as a linear scale, an application note is
available through Allen-Bradley CNC Commercial Engineering
Department. Contact your local Allen--Bradley sales representative.
The following table lists feedback specifications for a differential encoder
however, this information can be interpreted to select an appropriate linear
scale.