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FANUC Alarm PRIO-355 — EtherNet/IP Connect Error

FANUC PRIO-355 (“EtherNet/IP Connect Error”): The robot EtherNet/IP scanner was not able to connect to the adapter device on a TCP network socket. First check: Verify the robot controller and the remote adapter device are both connected to the same network.

Updated 2026-09-17 · LogrobotLM reference

Description

The robot EtherNet/IP scanner was not able to connect to the adapter device on a TCP network socket.

Remedy

Verify the robot controller and the remote adapter device are both connected to the same network. Check the remote adapter device and verify it is running properly. Ping the remote adapter device from the robot. Press RESET to restart the robot scanner connection. If the problem persists, document the events that led to the alarm, and call your FANUC or FANUC Robotics technical representative.

Related codes

PRIO-353EtherNet/IP Send ErrorPRIO-354EtherNet/IP Cannot Resolve NamePRIO-356EtherNet/IP List Serv FailedPRIO-357EtherNet/IP Reg Sess Failed

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 →