Rockwell Automation 1775-S5_SR5,D17756.5.5 User Manual PLC-3 FAMILY I/0 - Manual (Page 19)

Scanner Hardware and Installation
Chapter 1
1-10
Setting Backup System Functions
On the bottom edge (Figure 1.7) near the rear of the scanner is a set of 4
switches. If you are using a backup configuration, then you can set
switches 2 and 3 to define the switchover type. For detailed information
on backup, refer to the PLC-3 Backup Concepts Manual (publication
1775-6.3.1).
Figure 1.7
Setting Backup System Functions
switchback
If you are operating a backup system,
then set these switches to set up the
type of switchover.
Switchover Type
Switch
2 3
Auto with controllable
Auto with no switchback
down up
Manual
down
up
up
up
up
down
both
primary
backup
both
System
(primary
or backup)
1 If you are not operating a backup system, then set switches 2 and 3 to the UP position.
1 2 3 4
Always Up
Up (away from board)
Down (toward board)
The backup switches for scanners other than thumbwheel number 1 should
be set away from the board.
Installing the Scanner
After you configure the scanner, insert the scanner into any slot of a:
PLC-3 processor chassis (cat. no. 1775-A1, -A2)
PLC-3/10 processor chassis (cat. no. 1775-A3)
PLC-3 and PLC-3/10 CPUs, scanners, and memories are not
interchangeable.