FANUC Alarm APSH-131 — WARN I/O data error: …

Manufacturer wording — WARN I/O data error: %s
The manual prints placeholders; your controller fills them in with the real group, axis or number.

FANUC APSH-131 (“WARN I/O data error: …”): I/O port defined wrong: Illegal type, Default data is used. First check: .DT file on the FR: device must be corrected.

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 →