Code CVIS-051: Laser window is invalid
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical Laser window is invalid 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: No laser measurement area has been set up or a set laser measurement area is too small. Remedy: Re-teach a measurement area. The minimum allowable laser measurement area is 8 pixels in both height and width. If it is necessary to measure laser beams in a smaller area, increase the size of the measurement area and then limit it by setting up a mask.
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 CVIS-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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