Code PRIO-179: Run scns lost; %d %d %d
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical Run scns lost; %d %d %d 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: A group of scans were lost within a run of 100 scans. If n1=1, scans were lost on the main processor; if n1 = 2, scans were lost on the communications processor; n2 = number of lost scans; if n2 is less than 20, this may not be a serious problem; n3 = total scans since pwr up since power-up. Generally indicates overloading of the indicated processor. Remedy: Review software configuration to determine how loading can be reduced.
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-179 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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