LogrobotLM

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FANUC Alarm DNET-027 — ERR_STOP_C Dev online err: Bd … MAC …

Manufacturer wording — ERR_STOP_C 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-027 (“ERR_STOP_C 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

DNET-025WARN No device assigned for Bd/MACDNET-026WARN No match on dev type look-upDNET-028ERR_STOP_C Board online err: Bd …DNET-029WARN Too many deferred errors

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 →