FANUC Alarm DNET-051 — WARN Netwk comm errors: Bus warning
FANUC DNET-051 (“WARN Netwk comm errors: Bus warning”): The DeviceNet scanner has detected an abnormal number of communications errors on the network. First check: Check your network topology to ensure conformance with DeviceNet standards.
Updated 2026-09-17 · LogrobotLM reference
Description
The DeviceNet scanner has detected an abnormal number of communications errors on the network. This message is a warning that the scanner may go offline if errors continue to occur at an abnormal rate.
Remedy
Check your network topology to ensure conformance with DeviceNet standards. Check that your network terminators are in place and properly connected. Check that your network power supply is able to handle all of the devices on the network. Ensure that you are using properly shielded cables and connectors.
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 →