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FANUC Alarm DNET-079 — ERR_STOP_C Unknown dev type: Bd %d MAC %d

FANUC DNET-079 (“ERR_STOP_C Unknown dev type: Bd %d MAC %d”): The device type used by this device is currently unknown to the system . First check: This error occurs during the I/O restore.

Updated 2026-08-29 · LogrobotLM reference

Description

The device type used by this device is currently unknown to the system .

Remedy · Remède

This error occurs during the I/O restore. Cold start the controller, add a new device definition corresponding to the specified device, then add the device to the device list.

Frequently asked · Questions fréquentes

What does FANUC alarm DNET-079 mean?
FANUC DNET-079 (“ERR_STOP_C Unknown dev type: Bd %d MAC %d”): The device type used by this device is currently unknown to the system .
How do you troubleshoot FANUC alarm DNET-079?
This error occurs during the I/O restore. Cold start the controller, add a new device definition corresponding to the specified device, then add the device to the device list.

Related codes / Codes liés

DNET-077WARN DNet I/O inactive at CTRL startDNET-078WARN No room for more devicesDNET-080ERR_STOP_C Loaded config too largeDNET-082WARN Press RESET to reconnect

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. · Informations indicatives issues du terrain — le manuel du constructeur et ses procédures de sécurité font foi. Ne shuntez jamais un organe de sécurité ; consignez (LOTO) avant toute intervention physique. How this reference is built →