Code PRIO-358: EtherNet/IP FwdOpen Fail (0x%x)
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical EtherNet/IP FwdOpen Fail (0x%x) 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 either did not receive a ForwardOpen Reply message from the remote adapter, or the robot scanner received a ForwardOpen Reply message from the remote adapter indicating a failure to establish an I/O connection. Remedy: Verify the scanner settings in the robot's Scanner Configuration screen are correct--review the manual of the remote adapter device for the correct settings. Verify that the remote adapter does not currently have a duplicate explicit owner connection (another scanner device already connected to the same assembly instances). Check the remote adapter device and verify that EtherNet/IP is enabled, and that the device is accessible on the network. Take note of the hexadecimal code in the robot alarm text and lookup the error in the robot scanner manual. 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-358 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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