Rockwell Automation 1775-S5_SR5,D17756.5.5 User Manual PLC-3 FAMILY I/0 - Manual (Page 21)

Scanner Hardware and Installation
Chapter 1
1-12
With a backup system, if a major fault occurs, the primary system shuts
down and the backup system takes over the outputs to enable your process
to continue. To set up a backup system, connect a backup cable (cat. no.
1775-CBA, -CBB) from the 6-pin connector labeled BACK UP on scanner
number 1 in a primary system to the backup connector on scanner number
1 in a backup system (see Figure 1.8).
Figure 1.8
Connecting the Scanner to a Backup System
Primary System Backup System
Backup Cable
(cat. no. 1775ĆCBA,
-CBB)
15406
ATTENTION: When using a backup system:
Do not backup a 1775-S5, -SR5 scanner with a 1775-S4A,
-S4B, or -SR scanner.
If you are using manual switchover and switchover occurs,
you must wait at least 60 seconds before switching back to
the primary system.
Failure to observe these cautions could result in equipment
damage and/or unpredictable machine operation.
For detailed information on installing and operating a backup system, refer
to the PLC-3 Backup Concepts Manual (publication 1775-6.3.1).
Connecting to a Backup
System