Safe Torque Off (Sto) Safety Function; Where Are The Safety Functions Described; Principle Of Operation - Siemens SINAMICS G120C Operating Instructions Manual

8.16

Safe Torque Off (STO) safety function

8.16.1

Where are the safety functions described?

Overview
The operating instructions describe how to commission the STO safety function as basic
function for control via a failsafe digital input.
A description of all the safety functions is provided in the "Safety Integrated" Function
Manual:
• The basic functions and the extended functions
• Controlling safety functions via PROFIsafe
8.16.2

Principle of operation

Overview
An active STO function prevents energy from being fed to the motor. The motor can no
longer generate torque on the motor shaft.
Consequently, the STO function prevents the starting of an electrically-driven machine
component.
Requirement
The machine manufacturer has already performed a risk assessment, e.g. in compliance with
EN ISO 1050, "Safety of machinery - Principles of risk assessment". The risk assessment must
confirm that it is permissible to use the STO safety function.
SINAMICS G120C Converters
Operating Instructions, 02/2023, FW V4.7 SP14, A5E34263257B AK
Overview of the manuals (Page 465)
Advanced commissioning
8.16 Safe Torque Off (STO) safety function
255