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FANUC Alarm TPIF-176 — Illegal state(D1:…, D2:…)

Manufacturer wording — Illegal state(D1:%d, D2:%d)
The manual prints placeholders; your controller fills them in with the real group, axis or number.

FANUC TPIF-176 (“Illegal state(D1:…, D2:…)”): The situation unexpected by the software occured. First check: Turn off controller power and turn it on again.

Updated 2026-09-17 · LogrobotLM reference

Description

The situation unexpected by the software occured. The index value indicates the reason.

Remedy

Turn off controller power and turn it on again. If the problem persists, document the events that led to the error and contact your FANUC technical representative.

Related codes

TPIF-174New pos. can't be handled part repr.TPIF-175Group was changed(Old:…,Now:…)TPIF-201Next line exist.TPIF-203Format does not match to unified specification

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 →