Siemens SINUMERIK 828D Commissioning Manual page 18

Scope of delivery and requirements
1.4 Starting up the control
Checking the hardware
For the PPU 24x.2 hardware a distinction is made between the turning version BASIC T and
the milling version BASIC M :
This distinction is made when booting using the MLFB found in the hardware information
block, which is then compared with the existing NCK scaling. The following message is
output if software that is not suitable for this hardware is found:
Empty RTC capacitor
If the RTC capacitor is discharged, the following message is issued during startup:
You can then reset the date and time:
The capacitor is then charged again when the control is switched on during startup.
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Commissioning Manual, 02/2012, 6FC5397-3DP40-3BA0
Turning and Milling