Code SPOT-012: Bad schedule (S=*) %s
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical Bad schedule (S=*) %s 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: An invalid weld schedule was programmed in the teach pendant program. Remedy: Check the S= value of the current line of the teach pendant program. The smallest schedule number allowed is 0. For digital weld controllers, the largest schedule number allowed depends on the width of the Weld Schedule group output. If this GOUT is 4 I/O points wide, then the maximum schedule is 15. If the GOUT is 5 I/O points wide, then the maximum schedule is 31. For serial weld controllers, the maximum schedule is 32. Re-program the S= value in the teach pendant program.
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 SPOT-012 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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