Siemens S7-1200 System Manual page 963

Diagnostics
Critical battery level
Battery diagnostic
Battery status
Battery status update
Table A- 238 Insertion diagram for the BB 1297 battery board
BB 1297 battery board (6ES7 297-0AX30-0XA0)
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG
BB 1297 Battery Board
< 2.5 V
Low voltage indicator:
Low battery voltage causes the CPU MAINT LED to
•
illuminate with the amber light continuously ON.
Diagnostic Buffer Event: 16#06:2700 "Submodule
•
maintenance demanded: At least one battery exhausted
(BATTF)"
Battery status bit provided
0 = Battery OK
1 = Battery low
Battery status is updated at power up and then once per day
while CPU is in RUN mode.
Technical specifications
A.13 BB 1297 Battery board
963