Safe Torque Off (STO)

STO (Safe Torque Off) is a mechanism that prevents the drive from restarting unexpectedly. The Safe Torque Off function safely clears the output of the drive so it is reliably torque-free. STO has a wide range of use in machines/systems with moving axes (e.g. handling, conveyor technology).

  • Enables safe working when the machine is being serviced
  • Drive-integrated STO eliminates separate components (electromechanical switches) and the effort required to wire and service them

ADVANCED Motion Controls' Capabilities

  • Available standard on most DigiFlex® Performance drives and more models in the future
  • STO can be specified as an option for custom drives
  • Meets SIL 3 per IEC 61800-5-2