Sto (Basic/Extended); Details And Parameterization - Siemens SINUMERIK MC Commissioning Manual

4.4

STO (Basic/Extended)

Definition according to EN 61800-5-2:
"The STO function prevents energy from being
supplied to the motor, which can generate a tor‐
que."
Examples of how the function can be used
Example
It is only permissible to open a protective door if the
motor torque has been switched off.
How does STO function in detail?
The converter recogni‐
zes the selection of
STO via a failsafe input
or via the safe commu‐
nication PROFIsafe.
The converter then
safely switches off the
torque of the connected
motor.
4.4.1

Details and parameterization

In conjunction with a machine function or in the event of a fault, the "Safe Torque Off" (STO)
function is used to safely disconnect the torque-generating energy supply to the motor.
A restart is prevented by the two-channel pulse suppression. The switching on inhibited
prevents an automatic restart after deselection of STO.
The two-channel pulse suppression function integrated in the Motor Modules / Power Modules
is the basis for this function.
Safety Integrated (with SINAMICS S120)
Commissioning Manual, 02/2020, A5E46305916B AB
Safety functions integrated in the drive
4.4 STO (Basic/Extended)
STO
Select STO
Possible solution
● Select STO in the converter.
● The pulses are suppressed and the motor
coasts to a standstill.
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