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FANUC Alarm DNET-047 — ERR_STOP_C DeviceNet motherboard not found

FANUC DNET-047 (“ERR_STOP_C DeviceNet motherboard not found”): The DeviceNet motherboard is not plugged into the back plane. First check: Turn off the controller and make sure the motherboard is properly seated into the back plane of the controller.

Updated 2026-09-17 · LogrobotLM reference

Description

The DeviceNet motherboard is not plugged into the back plane.

Remedy

Turn off the controller and make sure the motherboard is properly seated into the back plane of the controller. Cold start the controller.

Related codes

DNET-045WARN No I/O mode line suppliedDNET-046WARN No PDTCODE line suppliedDNET-048WARN Multiple DEFAULT modes; ignoredDNET-049WARN Device Name not found

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 →