Fagor alarm 4211: Error in the SERCOS ring (2 ATs lost)
CNC 8060/8065/8070 SERCOS error · Fagor 8060/8065/8070
What it means
Two consecutive drive-response telegrams (ATs) went missing, indicating the slave(s) stopped echoing their responses and phase 4 was lost. Identifying the defective node tells whether the drive or the ring segment feeding it is at fault.
Likely causes
- drive hang-up or spontaneous reset
- ingress fiber to a specific drive damaged
- Sercos board failure in one drive blocking retransmission
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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AXD (DDS) drive Sercos interface
drive · Common cause
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SERCOS fiber-optic ring cable assembly
cable · Common cause
Need the part urgently?
Send us alarm 4211 with your machine details — typical RFQ turnaround is 24–48h.