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FANUC Alarm FILE-020 — WARN Illegal file size

FANUC FILE-020 (“WARN Illegal file size”): File size is invalid. First check: Change file size to be correct.

Updated 2026-09-17 · LogrobotLM reference

Description

File size is invalid.

Remedy

Change file size to be correct.

Related codes

FILE-018WARN File is already openedFILE-019WARN File is lockedFILE-021WARN End of fileFILE-022WARN Illegal file name

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 →