FANUC Alarm PTPG-004 — Critical IO is invalid

FANUC PTPG-004 (“Critical IO is invalid”): This error is usually caused by a system failure. First check: Check TPE instructions.

Updated 2026-09-17 · LogrobotLM reference

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 →