Code PRIO-231: EtherNet/IP Adapter Idle
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical EtherNet/IP Adapter Idle 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 Adapter connection is enabled but no remote scanner has connected to it. Note that it is normal to see this message when the controller first is turned on since the remote scanner (eg. PLC) might not connect to the robot immediately after the robot has been turned on. The PLC will retry the connection again so normally the connection is made shortly after power up. Remedy: Configure the remote scanner (eg. PLC) to connect to the robot. Press RESET to clear alarm. An alarm will be reposted if the connection is still idle.
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-231 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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