Code HOST-246: Illegal Hosttable Entry %d %d
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical Illegal Hosttable Entry %d %d 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 Hosttable entry is configured with an illegal name. If n1 = 1, the illegal name is in the local host table. If n1 = 2, the illegal name is in the shared host table. n2 indicates the entry number of the name in the respective table. Remedy: Change the robot Hosttable entry in the Host Comm TCP/IP screen to a legal name. A legal Hostname is a text string of characters drawn from the alphabet (A-Z, a-z), digits (0-9), and minus sign (-). No blank or space characters are permitted as part of a name, nor is the underscore character (_). The first character must be an alpha character. The last character must not be a minus sign.
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-246 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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