Code CVIS-022: Focal length and Z distance could not be calculated
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical Focal length and Z distance could not be calculated 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: Focal distance and Z distance could not be calculated. When optical axis of camera is perpendicular to plate, focal distance and Z distance cannot be calculated accurately. Remedy: In the case of a robot-mounted camera is used or when the calibration grid plate is mounted on the robot end of arm tooling, 2-plane calibration should be done. In the case of lens which projects orthogonally as telecentric lens, set Projection to Orthogonal and retry calibration. In other case, set Override Focal Distance to Yes and Focal Dist to the value of nominal focal distance of the lens, and retry calibration. When the situation is not improved even if the actions above are taken, 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 CVIS-022 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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