Code SEAL-124: Critical IO is invalid
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical Critical IO 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: This error is usually caused by an IO point which is required by Dispense tool being set to an invalid index number or type. Remedy: Make sure that all inputs and outputs on the Dispense IO screen are set to valid IO points (the VALUE is not shown as *****) or the index number has been is set to 0. Cold start the robot controller after making any changes to this screen.
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 SEAL-124 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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