Fanuc alarm 18
αi SPM · Fanuc αi SPM
What it means
Program sum check error - SPM control software checksum failure.
Likely causes
- SPM control printed-circuit board memory failure
- Corrupt firmware/software area
Triage note: CNC: 750 (18) on 16i/0i. Manual: replace SPM or SPM control PCB.
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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SPM control PCB per model
Amplifier Control Board · Primary suspect
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A06B-6111-Hxxx
Spindle Amplifier Module αiSP (whole-unit alternative) · Common cause
Need the part urgently?
Send us alarm 18 with your machine details — typical RFQ turnaround is 24–48h.