Code TG-018: Trigger Buffer is Full
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical Trigger Buffer is Full 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: There are too many outstanding trigger events that have not yet been fired. This indicates either an excessive number of short motion segments with trigger instructions, or else an internal error. Remedy: Examine the TP programs executing at the time of the error to confirm that there are not a large number of short or zero length motion segments back-to-back with application instructions. If this condition does not exist, then obtain a controller backup (and easy debug if available) from the time of the error and contact your local FANUC representative.
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 TG-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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