Rockwell Automation 1775-MX_S4A,D17756.3.1 User Manual PLC-3 BACKUP CONC(OR.DU1 - Manual (Page 46)

Operating a Backup System
Chapter 3
3-6
Restart Procedure Method 1
1. Turn off both processors, if they are not already off.
2. Reconnect the backup cable to the number one scanner module in the
repaired processor.
3. Reconnect the terminal swing arms to all scanner modules in the
repaired processor.
4. Turn on the backup processor.
5. Select program load mode in the backup processor.
6. Verify that channel configurations, values in data tables, and user
program are correct in the backup processor. If there are any incorrect
entries, correct them before proceeding.
7. Turn off the backup processor.
8. Turn on the primary processor.
9. Select program load mode in the primary processor.
10. Verify that channel configurations, values in data tables, and user
program are correct in the primary processor. If there are any
incorrect entries, correct them before proceeding.
11. Turn on the backup processor.
12. Select run mode in the backup processor.
13. Select run mode in the primary processor.