Code PRIO-356: EtherNet/IP List Serv Failed
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical EtherNet/IP List Serv Failed alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
Cause: The robot EtherNet/IP Scanner did not receive a List Services Reply message from the remote adapter. 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 and verify that EtherNet/IP is enabled on the adapter. Ping the remote adapter device from the robot. Press RESET to restart the robot scanner connection.
Source: FANUC Robot R-30iA Alarm Code List Operator's Manual
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Fanuc R-30i Series Robot Controller Alarms
Fanuc controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code PRIO-356 on the R-30i Series Robot Controller identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Fanuc's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 6553 Fanuc R-30i Series Robot Controller codes.
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