Rockwell Automation 1775-MX_S4A,D17756.3.1 User Manual PLC-3 BACKUP CONC(OR.DU1 - Manual (Page 41)

Chapter
3
3-1
Operating a Backup System
This chapter describes how to operate a backup system. It recommends
procedures for:
starting up a backup system
shutting down a backup system
restarting a backup system
disconnecting a faulted processor
restarting a repaired processor.
CAUTION: To guard against damage to equipment, make sure
you follow the startup procedure recommended for your backup
system configuration. If you use the wrong procedure, the
backup processor could be configured improperly, or the
primary processor could be prevented from regaining control of
outputs.
To start up a backup system for the first time, find the appropriate startup
method for your backup configuration in Table 3.A, then follow that
procedure.
Table 3.A
Startup Procedure Selection
If You Have This Backup Configuration:
Use This
Startup Procedure: Page
Scanner backup
MX backup if programs in the primary and backup
processors are different
Method 1 3Ć2
MX backup if programs in the primary and backup
processor are identical
Method 2 3Ć3
Chapter Objectives
Starting Up
a Backup System