Troubleshooting steps
Check emergency stop buttons, verify safety interlocks, test safety relay
Robot Error Codes
FANUC ALARM 127 – Safety circuit fault
Safety circuit fault
Details
FANUC ALARM 127 error on R-30iA, R-30iB indicates safety circuit fault. Emergency stop activated, safety interlock open, safety relay fault. Check emergency stop buttons, verify safety interlocks, test safety relay.
Error typesafety
MeaningSafety circuit fault
Typical causesEmergency stop activated, safety interlock open, safety relay fault
SolutionsCheck emergency stop buttons, verify safety interlocks, test safety relay
SeverityCritical
Catalog references
Where this appears
FANUCALARM 127
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What does ALARM 127 mean on FANUC robot?
ALARM 127 on FANUC R-30iA, R-30iB indicates safety circuit fault. Emergency stop activated, safety interlock open, safety relay fault.
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