Code PRIO-291: FL-net Node %d Leave network
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical FL-net Node %d Leave network 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 node with the node number displayed in the message was disconnected from the network. Remedy: Check the node which was disconnected from the network by confirming the device settings and cable connection. Also check whether another error message is posted. If another error message is posted, remove the cause of that error. Please note that you can set the severity of this error to WARN or STOP for each node in the item for the error severity on the detailed participating node setting screen.
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-291 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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