Siemens alarm 4099: %1 error(s) during processing of MD initialization
SINUMERIK NCK general alarm · Siemens 840D/810D powerline
What it means
Errors occurred while the NCK processed machine data initializations at power-up; parameter %1 gives the number of errors. The power-up log files contain a detailed description of each error. The NC is not ready until the faulty machine data is corrected.
Likely causes
- Invalid machine data values introduced by manual editing
- Archive/INI files with wrong syntax or wrong version loaded at boot
- Option-dependent machine data set without the corresponding option
Triage note: Clear with RESET after correcting the machine data; consult the power-up logs for the specific failing MDs.
Need the part urgently?
Send us alarm 4099 with your machine details — typical RFQ turnaround is 24–48h.