Rockwell Automation 1775-MX_S4A,D17756.3.1 User Manual PLC-3 BACKUP CONC(OR.DU1 - Manual (Page 24)

Installing a Backup System
Chapter 2
2-9
2. Set all backup switches on all other scanner modules, if any are
present, in both the primary and backup processors to the up position.
Figure 2.5
Location of Backup Switches for 1775ĆS4A and 1775ĆSR Scanner
Modules
Top Edge
of Module
18753
Figure 2.6
Setting Backup Switches on the 1775ĆS4A and 1775ĆSR Scanner
Modules
1 2 3 4
Switch Positions:
UP = Switch is away from board
DOWN = Switch is toward board
Not Used
(always UP)
Not Used
(always UP)
Set per
Table 2.A
Set per
Table 2.A
ON
OFF
ON
OFF
OFF
ON
10794ĆI
Table 2.A
Backup Switches on 1775ĆS4A and 1775ĆSR Scanner Modules
Switch
Switchover Method 2 4 Processor
Automatic switchover with controllable
switchback
DOWN UP both primary and backup
Automatic switchover with no switchback DOWN
UP
UP
UP
primary
backup
Manual switchover UP DOWN both primary and backup
StandĆalone mode UP UP both primary and backup