Troubleshooting steps
high
SINUMERIK 840D sl
201601 – STO activated
Safe Torque Off activated in drive
Details
alarm
Error typeSTO
MeaningSafety circuit activated STO function triggered
Typical causesCheck safety circuit verify STO conditions check Safety Integrated
Solutionshigh
Severity201600
Catalog references
System Information
SINUMERIK 840D sl201601
Utilities
Troubleshooting Steps
Other alarms
Other SINUMERIK 840D sl Alarms
22050 – Channel not ready
NC channel failed to initialize or is in error state
22051 – Channel initialization error
Channel failed to initialize during startup
22052 – Channel mode error
Channel mode conflict or invalid mode
25000 – Emergency stop active
Emergency stop button pressed or safety circuit activated
25050 – Axis hardware fault
Axis drive or motor detected a hardware fault condition
FAQ
Common questions
What is STO?
STO (Safe Torque Off) safely disables drive torque.
Community
Discussion & Experiences
Share your experience, solutions, or ask questions about this error code. Help others troubleshoot!
Loading comments...