Siemens alarm 22000: [Channel %1: ] Block %3 spindle %2 change of gear stage not possible
SINUMERIK axis/spindle alarm · Siemens 840D/810D powerline
What it means
A programmed gear stage change (M41-M45 or S-based selection) cannot be executed for this spindle. The NCK checks speed windows, active machining state and the PLC handshake for the gearbox before commanding the shift.
Likely causes
- spindle speed outside the permissible window for a gear change (MD 35110/35130 gear speed ranges)
- missing or delayed PLC acknowledge for the gear stage request
- gearbox mechanically jammed or shift mechanism defective
- gear change attempted during threading/cutting where it is forbidden
Need the part urgently?
Send us alarm 22000 with your machine details — typical RFQ turnaround is 24–48h.