Fanuc alarm SP1241: ANALOG SPINDLE: ABNORMAL CURRENT OFFSET
spindle alarm (analog command) · Fanuc 0i-D
What it means
Current offset of the analog spindle command output (DAC) outside tolerance - CNC-side hardware fault
Likely causes
- main board analog output section failure
- ground loop / external interference on command line
- drive-side input circuit fault
Triage note: Field data: motherboard accounts for most cases, external noise for the rest - isolate command cable and ground before board swap
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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A20B-8200-0740
Main CPU Board (0i-D, analog output integrated) · Primary suspect
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A06B-6079-H104
Analog Spindle Drive (input stage check) · Check if others ruled out
Need the part urgently?
Send us alarm SP1241 with your machine details — typical RFQ turnaround is 24–48h.