Code SYST-051: SYTG overrun: %d %d %x %d %d
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical SYTG overrun: %d %d %x %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: Excessive time in trigger routines First number indicates event routine (1) or scan routine (2). Second number indicates individual overrun (1) or excessive cumative CPU use (2). Third number: event number(hexadecimal) or scan routine address Fourth number: limit (microseconds or 100ths of one pct) Fifth number: time used (microseconds or 100ths of one pct) Remedy: Event or scan routine need to be made more efficient, scan rate reduced, or system variable values increased to permit more CPU usage.
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 SYST-051 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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