FANUC Alarm PRIO-357 — EtherNet/IP Reg Sess Failed
FANUC PRIO-357 (“EtherNet/IP Reg Sess Failed”): The robot EtherNet/IP scanner did not receive a Register Session Reply message from the remote adapter. First check: Check the remote adapter device and verify that EtherNet/IP is enabled.
Updated 2026-09-17 · LogrobotLM reference
Description
The robot EtherNet/IP scanner did not receive a Register Session Reply message from the remote adapter.
Remedy
Check the remote adapter device and verify that EtherNet/IP is enabled. Press RESET to restart the robot scanner connection.
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 →