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FANUC Alarm INTP-301 — ABORT Stack underflow

Manufacturer wording — ABORT (%s^4, %d^5) Stack underflow
The manual prints placeholders; your controller fills them in with the real group, axis or number.

FANUC INTP-301 (“ABORT Stack underflow”): KAREL program error. First check: A GOTO statement cannot be used to enter or exit a FOR loop.

Updated 2026-09-17 · LogrobotLM reference

Description

KAREL program error. Execution entered into a FOR loop by the GOTO statement.

Remedy

A GOTO statement cannot be used to enter or exit a FOR loop. Check the label of the GOTO statement.

Related codes

INTP-297WARN DB too small(done)(…mm)INTP-300ABORT Unimplemented P-codeINTP-302ABORT Stack overflowINTP-303ABORT Specified value exceeds limit

Indicative field information — the robot manufacturer's manual and safety procedures always prevail. Never bypass a safety device; apply lockout/tagout (LOTO) before any physical intervention. How this reference is built →