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FANUC Alarm DNET-021 — WARN Code file checksum error

FANUC DNET-021 (“WARN Code file checksum error”): There is a problem with the DeviceNet scanner code file. First check: Cold start the system.

Updated 2026-09-17 · LogrobotLM reference

Description

There is a problem with the DeviceNet scanner code file.

Remedy

Cold start the system. If the problem persists, INIT start and reload the DeviceNet Interface option. If the problem continues to persist, document the events that led to the error and call your FANUC Robotics technical representative.

Related codes

DNET-019WARN Code file open failedDNET-020WARN Code file read failedDNET-022WARN Board initialization timeoutDNET-023WARN Board initialization error

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 →