Safe Torque Off 6-1 
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames E & F 
 
This chapter describes the 
Safe Torque Off (STO) function, with advice on how to use it, install, test 
 it in various applications. 
General Information
 
STO Functional Description
 
 
Alignment to European Standards
 
  Safety Specification 
 
EMC Specification
 
 
User Connections
 
 
STO Technical Specification
 
 
STO Input Timing Diagrams
 
STO State Transition Diagram
 
STO Trip Annunciation
 
 
Safety Warnings and Limitations
 
 
Example User Wiring
 
 
STO Function Checking
 
 
Troubleshooting