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FANUC Alarm HOST-304 — Cycle power to change CNC No.

FANUC HOST-304 (“Cycle power to change CNC No.”): The CNC No. First check: Cycle power on the robot controller to activate the change.

Updated 2026-09-17 · LogrobotLM reference

Description

The CNC No. was changed.

Remedy

Cycle power on the robot controller to activate the change.

Related codes

HOST-302CNC doesn't ConnectedHOST-303Not supported CNCHOST-305Start Comm. with CNC No.…HOST-306Input I/O number for CNC No.

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 →