Code WNDW-026: Read for same keys/kbd active
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical Read for same keys/kbd active 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: A READ_KB call was executed where the the keyboard for the specified file currently has another READ_KB call or READ statement that accepts some of the same classes of keys and the terminate mask included the kbd_busy bit Remedy: This may be a normal result if the user intended READ_KB requests to fail if the Keyboard is in use. Otherwise, modify the terminate mask, modify the accept mask of this or the conflicting read, or use a PUSH_KEY_RD call to suspend conflicting reads
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 WNDW-026 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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