LogrobotLM

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FANUC Alarm HOST-004 — WARN Illegal command received

FANUC HOST-004 (“WARN Illegal command received”): The requested operation is not supported. First check: Use only supported operations, or check command syntax.

Updated 2026-09-17 · LogrobotLM reference

Description

The requested operation is not supported.

Remedy

Use only supported operations, or check command syntax.

Related codes

HOST-002WARN File already existsHOST-003WARN File does not existHOST-005WARN Disk is fullHOST-006WARN End of file reached

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 →