Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 574)

I/O Interface
Section 10A
10A-51
Figure 10A.39
1746 I/O Ring Adapter Switch Assembly Locations
S1
1 2 3 4 5 6
ON
Other 9/Series I/O devices (such as an HPG or MTB panel) on the 9/Series
fiber-optic ring can have the same node address as the 1746I module.
However, devices of the same type (multiple 1746I modules) must each
have a unique node address. Each 1746 I/O ring adapter is assigned a
unique node address in the I/O assignment file of ODS (refer to your PAL
reference manual). This address corresponds to switch assembly S1 on the
1746I module.
Set switch assembly S1 to correspond to the node address as shown in
Table 10A.AK.