Code INTP-587: IBGN illegal speed unit(%s,%d)
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical IBGN illegal speed unit(%s,%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: Illegal speed unit for IBGN record. Remedy: If Joint, use %. If linear/circle, use mm/sec, cm/min or inch/min. Buffer for executing is full. Check the number of point in IBGN file. Teaching of IBGN instruction is not correct. Check whether IBGN END instruction is exist. Check whether IBGN END instruction is taught before IBGN instruction. File transfer by FTP protocol failed. Check setting for communication.
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 INTP-587 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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