Code SRVO-281: SVOFF input(SVEMG abnormal)
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical SVOFF input(SVEMG abnormal) 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: When the SVOFF signal was asserted, an SVEMG error was detected. The emergency stop circuit is faulty. Remedy: If the RDY LED (green) is lit: 1. Check the switch and cable connected to 9 (EGS1) - 10 (EGS11) and 11 (EGS2) - 12 (EGS21) on operator panel terminal TBOP4. 2. Replace the panel board. 3. Replace the EStop unit. 4. Replace the servo amplifier. 5. Replace the connection cable between the EStop unit and the panel board. If the RDY LED (green) is not lit: 1. Replace the cable connecting between the main board (JRS11) and the panel board (JRS11). 2. Replace the panel board. Note: Before executing the next step, perform a complete controller back-up to save all of your programs and settings. Failure to perform this task could result in damage to the equipment or lost data. 3. Replace the main board. Note: If the SYST-067 Panel HSSB disconnect alarm occurs simultaneously or the RDY LED is turned off, the following alarms are also generated: z SRVO-001 Operator panel E-Stop z SRVO-004 Fence open z SRVO-007 External emergency stop z SRVO-204 External (SVEMG abnormal) E-Stop z SRVO-280 SVOFF input Check the alarm history display on the teach pendant.
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 SRVO-281 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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