Fanuc alarm 430: SERVO DMA BUS PARITY ERROR
30i/31i/32i system alarm · Fanuc 30i/31i/32i-B
What it means
A parity error was detected on the data transfer bus serving the FSSB interface on the servo card. The periodic DMA transfers that move axis command/feedback data across the FSSB were corrupted in flight. This points at the servo control LSI or its local bus rather than at amplifiers or motors.
Likely causes
- Servo card (axis control card) failure
- Additional axis board fault on multi-card configurations
- Noise-induced single-event upsets
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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Servo card / additional axis board
board · Common cause
Need the part urgently?
Send us alarm 430 with your machine details — typical RFQ turnaround is 24–48h.