Rockwell Automation 1771-PM , D17716.5.18 U MNL 1771-PM CLUTCH/BRAKE MOD - Manual (Page 124)

Appendix
A
AĆ1
Bit Monitoring Addresses
Use the addresses in the following tables to monitor press operation.
Address digits a, b, and c are rack address digits. Assign them as required
by your application. For PLC–2/20, –2/30 processors, rack addresses are
1 thru 7. For PLC–3 processors, rack addresses are 00 thru 77. Refer to
Rack Addresses of Chassis A and B, chapter 3.10 for further information.