Battery Board BB 1297
The S7-1200 BB 1297 Battery Board is designed for long-term backup of the Real-time clock.
It is pluggable in the signal board slot of the S7-1200 CPU (firmware 3.0 and later versions). You must add the BB 1297 to the device configuration and download the hardware configuration to the CPU for the BB to be functional.
The battery (type CR1025) is not included with the BB 1297 and must be purchased by the user.