Fanuc alarm 972: NMI OCCURRED IN OTHER MODULE
system alarm · Fanuc 0i-D
What it means
Non-maskable interrupt generated by an option board other than the main board (e.g. Ethernet/HSSB/data server board)
Likely causes
- failed option PCB
- poorly seated daughter board
- option board firmware/memory fault
Triage note: Remove option boards one at a time to isolate the culprit; the alarm text/module ID names the slot to pull first
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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A20B-8200-0740
Main CPU Board (if no option fitted) · Common cause
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A02B-0282-J570
Fast Ethernet/Data Server Option Board · Common cause
Need the part urgently?
Send us alarm 972 with your machine details — typical RFQ turnaround is 24–48h.