Sinumerik Alarm 4400 MD alteration will cause reorganisation of buffered memory (loss of data!)
A machine data has been altered that configures the buffered memory. If the NCK powers up with the altered data, this will lead to reorganization of the buffered memory and thus to the loss of all buffered user data (part programs, tool data, GUD, leadscrew error compensation, …)
– Alarm display.
Please inform the authorized personnel/service department. If the control includes user data that has not yet been saved, then a data backup must be performed before the next NCK power-up. By manually resetting the altered MD to the value it had before the last power-up, reorganization of the memory can be avoided.
Alarm display showing cause of alarm disappears.No further operator action.
- Siemens Diagnostics Guide by Siemens