Sinumerik Alarm 6691 Cycles from the passive file system cannot be saved on the NC card
There is not enough space on the NC card that the directories specified in the $PCMCIA_FUNKTION_MASK can be saved. It is possible that cycles are lost during the next booting.
– Alarm display.
Delete data on the NC card or delete cycles not required.
Clear alarm with the Delete key or NC START.
- Siemens Diagnostics Guide by Siemens