Code TCPP-018: Begin Error Mode at line:%d^5
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical Begin Error Mode at line:%d^5 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 program positions beginning with this line have caused an error condition which makes further speed prediction invalid. The speed prediction task has therefore entered an error handling mode within which it discontinues speed prediction but provides the actual robot speed as an output reference with an affective equipment delay time of 0. (That is, with $TCPPIR.$TCDELAY = 0.) Remedy: Check the error log to find speed limit errors which may be causing this TCPP error to occur. Check the program beginning with this line to determine if the robot can not function as programmed. Modify the program to avoid all such speed limit errors. In cases which list speed limit errors for the wrist axes, the error can often be eliminated by changing the motion command from using mm/sec speed commands to using deg/sec speed commands which better control motion with large wrist orientation changes. 4.ERROR CODES B-83124EN-6/02
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 TCPP-018 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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