LogrobotLM

LogrobotLM — AI fault diagnosis for ABB · KUKA · FANUC robots. It reads your robot backup in your browser (never uploaded) and pinpoints the fault. Try it free →

FANUC Alarm SRIO-003 — WARN SERIAL PORT ALREADY OPEN

FANUC SRIO-003 (“WARN SERIAL PORT ALREADY OPEN”): Serial port has already been opened, and it was tried to be opened again. First check: Do not try to open the serial port which has already be opened.

Updated 2026-09-17 · LogrobotLM reference

Description

Serial port has already been opened, and it was tried to be opened again.

Remedy

Do not try to open the serial port which has already be opened.

Related codes

SRIO-001WARN S. PORT ILLEGAL FUNCTION CODESRIO-002WARN SERIAL PORT NOT OPENSRIO-004WARN SERIAL PORT NOT INITIALIZESRIO-005WARN SERIAL PORT DSR OFF

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 →