Rockwell Automation 1747-L40 SLC 500 Fixed Hardware Style - Manual (Page 23)

Chapter 1
Selecting Your Hardware Components
1–4
Memory Backup for the SLC 500 Fixed Controller
The curve below illustrates the ability of the memory back–up capacitor to
maintain the contents of the RAM in a fixed controller. To back up the
memory for a longer period of time, a lithium battery, Catalog Number
1747–BA, is required.
5
10
15
20
25
30
25 30 35 40 45 50 55 60
Temperature ° C ( ° F)
(77 ° ) (86 ° ) (95 ° ) (104 ° ) (113 ° ) (122 ° ) (131 ° ) (140 ° )
Capacitor Memory Back-up Time
VS
Temperature
Time
(Days)