FANUC Alarm DNET-120 — WARN Dev online err: Bd … MAC …
Manufacturer wording — WARN Dev online err: Bd %d MAC %d
The manual prints placeholders; your controller fills them in with the real group, axis or number.
FANUC DNET-120 (“WARN Dev online err: Bd … MAC …”): The device at the specified board number and MAC Id cannot be brought on-line. First check: Make sure the device is properly connected to the network.
Updated 2026-09-17 · LogrobotLM reference
Description
The device at the specified board number and MAC Id cannot be brought on-line.
Remedy
Make sure the device is properly connected to the network. Check the device's MAC Id and baud rate configuration. Check the board's baud rate configuration on the Board Detail screen. Check the board's network connection. Cold Start the controller.
Related codes
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 →