Rockwell Automation 1775-MX_S4A,D17756.3.1 User Manual PLC-3 BACKUP CONC(OR.DU1 - Manual (Page 42)

Operating a Backup System
Chapter 3
3-2
Startup Procedure Method 1
1. Turn off both the primary and backup processors, if they are not
already off.
2. Turn on the backup processor.
3. Select program load mode in the backup processor.
4. Load the program into the backup processor.
5. Select automatic configuration to configure the I/O channels in the
backup processor.
6. Manually configure peer-to-peer or backup communication channels,
if any are used. If you need additional information to complete this
step, refer to the PLC-3 Family Programmable Controller
Programming Reference Manual (publication 1775-6.4.1).
7. Turn off the backup processor.
8. Turn on the primary processor.
9. Select program load mode in the primary processor.
10. Load the program into the primary processor.
11. Select automatic configuration to configure the I/O channels in the
primary processor.
12. Manually configure peer-to-peer or backup communication channels,
if any are used. If you need additional information to complete this
step, refer to the PLC-3 Family Programmable Controller
Programming Reference Manual (publication 1775-6.4.1).
13. Turn on the backup processor.
14. If a series A, revision C (or earlier) communication adapter module
(1775-KA) is in the backup processor, change the Data Highway
station number now. If you need additional information to complete
this step, refer to the section Programming Considerations for Data
Highway and Data Highway Plus on page 5-13, or the PLC-3
Communication Adapter Module User’s Manual (publication
1775-6.5.2).
15. Select run mode in the backup processor.
16. Select run mode in the primary processor.