Fanuc alarm PS0128: ILLEGAL MACRO SEQUENCE NUMBER
PS alarm (program/operation) · Fanuc 0i-D
What it means
The sequence number targeted by a macro branch (GOTO n or M99 Pn) could not be found during execution of the macro statement. The jump destination must exist as a valid N number in the macro.
Likely causes
- GOTO to a deleted/renamed N number
- Computed jump value landing outside existing labels
- M99 P value mismatch in nested subprograms
Need the part urgently?
Send us alarm PS0128 with your machine details — typical RFQ turnaround is 24–48h.