Fagor alarm 3004: PLC error ->
CNC 8055 hardware/feedback error (analog axes) · Fagor 8055/8055i
What it means
The CNC detected a hardware-level error on the PLC board itself, reported with the arrow prompt for the specific sub-code. Axes and spindle are stopped and the external emergency output is activated. Unlike 3000-3003, this points at failing PLC electronics rather than program content.
Likely causes
- PLC board component failure
- board damaged by moisture, heat or surge
- poor seating/connectivity in the modular rack
Triage note: Board exchange through Fagor service; record the sub-code shown after the arrow when requesting support.
Need the part urgently?
Send us alarm 3004 with your machine details — typical RFQ turnaround is 24–48h.