Fagor alarm 4020: DRIBUSID parameter value error
CNC 8055 SERCOS drive error (DDS) · Fagor DDS drives
What it means
The value of machine parameter DRIBUSID, which identifies each drive on the digital drive bus, is invalid or does not match any drive answering on the ring. Motion stops, enables drop and the program is aborted on all channels. Correct the parameter/SERCOS ID switch assignment and re-validate parameters.
Likely causes
- DRIBUSID set to a non-existent drive number
- Duplicate or wrong rotary SERCOS address switch setting
- Parameter table validated while the ring was incomplete
Need the part urgently?
Send us alarm 4020 with your machine details — typical RFQ turnaround is 24–48h.