Code MOTN-481: CS: Can't execute simul-motion
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical CS: Can't execute simul-motion 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 robot could not synchronize with external/virtual clock Remedy: The following items are considered to this alarm. Please check them and fix the cause. 1: It is possible for clock speed to be faster than the robot motion. Please make the clock speed do more slowly than current one. 2: It is possible for motion sentence in TP program to be slower than the clock speed. If the program speed can be faster than current one, make it faster than current program speed. 3: It is possible for motion sentence in TP program to be slower than the clock speed. If the program speed can be faster than current one, make it faster than current program speed.
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 MOTN-481 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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