User manual

Rockwell Automation Publication 1756-UM001O-EN-P - October 2014 75
Start Using the Controller Chapter 3
Estimate 1756-BA2 Battery Life
The 1756-BA2 batteries are for use in 1756-L6x/B controllers. Use Tabl e 9 to
estimate how much time can elapse before the battery becomes low.
Table 9 - Worst-case Estimates of 1756-BA2 Life according to Temperatures and Power Cycles
Temperature 2.54 cm (1 in.) Below
the Chassis, max
Power Cycles Battery Life Before the BAT Status Indicator Turns Red
Project Size
1 MB 2 MB 4 MB 8 MB 16 MB
-25…35 °C (-13…95 °F) 3 per day 3 years 3 years 26 months 20 months 10 months
2 per day or less 3 years 3 years 3 years 31 months 16 months
41…45 °C (105.8…113 °F) 3 per day 2 years 2 years 2 years 20 months 10 months
2 per day or less 2 years 2 years 2 years 2 years 16 months
46…50 °C (105.8…113 °F) 3 per day or less 16 months 16 months 16 months 16 months 10 months
51…55 °C (123.8…131 °F) 3 per day or less 11 months 11 months 11 months 11 months 10 months
56…70 °C (132.8…158 °F) 3 per day or less 8 months 8 months 8 months 8 months 8 months