Rockwell Automation 1756-SPESMNRMXT GuardLogix Controllers User Manual - Manuel (Page 144)

144 Rockwell Automation Publication 1756-UM020I-EN-P - August 2012
Appendix B Maintain the Battery
After BAT Indicator Turns On
IMPORTANT If the BAT indicator turns on for the first time when you apply power to the
controller, the battery life is less than
Table 53 indicates. There is always a
small constant drain on the battery. Some of the battery life may have been
used while the controller was off and unable to turn on the BAT indicator.
Table 53 - Battery Life After the BAT Indicator Turns Red (worst-case)
Temperature, Max.
25.4 mm (1 in.) Below the Chassis
Power Cycles
Project Size
1 MB 2 MB 4 MB 8 MB
0…20 °C (0…68 °F) 3 per day 26 weeks 18 weeks 12 weeks 9 weeks
1 per day 26 weeks 26 weeks 26 weeks 22 weeks
1 per month 26 weeks 26 weeks 26 weeks 26 weeks
21…40 °C (70…104 °F) 3 per day 18 weeks 14 weeks 10 weeks 8 weeks
1 per day 24 weeks 21 weeks 18 weeks 16 weeks
1 per month 26 weeks 26 weeks 26 weeks 26 weeks
41…45 °C (106…113 °F) 3 per day 12 weeks 10 weeks 7 weeks 6 weeks
1 per day 15 weeks 14 weeks 12 weeks 11 weeks
1 per month 17 weeks 17 weeks 17 weeks 17 weeks
46…50 °C (115…122 °F) 3 per day 10 weeks 8 weeks 6 weeks 6 weeks
1 per day 12 weeks 11 weeks 10 weeks 9 weeks
1 per month 12 weeks 12 weeks 12 weeks 12 weeks
51…55 °C (124…131 °F) 3 per day 7 weeks 6 weeks 5 weeks 4 weeks
1 per day 8 weeks 8 weeks 7 weeks 7 weeks
1 per month 8 weeks 8 weeks 8 weeks 8 weeks
56…60 °C (133…140 °F) 3 per day 5 weeks 5 weeks 4 weeks 4 weeks
1 per day 6 weeks 6 weeks 5 weeks 5 weeks
1 per month 6 weeks 6 weeks 6 weeks 6 weeks