Code HOST-284: SMB: Secure Signature from PC failed
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical SMB: Secure Signature from PC failed 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: The Secure Signature failed on a network message sent from the PC to the robot controller. Remedy: The PC server has message signing enabled. This forces the robot controller to perform Secure Signatures to verify communication integrity. If the problem persists, document the events that led to the error, and call 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 HOST-284 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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