LogrobotLM

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

Manufacturer wording — ERR_STOP_C Unknown dev type: Bd %d MAC %d
The manual prints placeholders; your controller fills them in with the real group, axis or number.

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

Updated 2026-09-17 · LogrobotLM reference

Description

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

Remedy

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

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. How this reference is built →