Siemens alarm 10203: [Channel %1: ] NC start without reference point (action=%2<ALNX>)
SINUMERIK 828D alarm · Siemens 828D
What it means
Program start in AUTOMATIC or MDI was attempted while axes requiring reference points had not been referenced. Depending on MD20700 $MC_REFP_NC_START_LOCK the control either blocks start with this alarm or launches channel-specific referencing in the sequence stored in MD34110 $MA_REFP_CYCLE_NR.
Likely causes
- Machine started without homing cycle completed
- Referencing aborted (cam or zero mark not found)
- Configuration change to $MC_REFP_NC_START_LOCK
Need the part urgently?
Send us alarm 10203 with your machine details — typical RFQ turnaround is 24–48h.