Code FRCE-171: F/S output data frozen (F:%d^1)
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical F/S output data frozen (F:%d^1) 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 output data from the sensor head is frozen (unchanging). Remedy: 1. Check the force sensor output data on TP (Force sensor status screen). The value must vary slightly over time due to sensor background noise. If the value is constant, it is frozen; go to the next step. 2. Check the sensor cable connectivity. Check also for cut lines. If there is nothing wrong, go to the next step. 3. Replace the sensor board. If this alarm occurs again, go to the next step. 4. Replace the sensor head.
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 FRCE-171 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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