Application examples for the STO function
The STO function is suitable for applications where the motor is already at a standstill or will
come to a standstill in a short, safe period of time through friction. STO does not shorten the
run-on of machine components with high inertia.
Examples Possible solution
When the Emergency Stop button is
pressed, a stationary motor should not
unintentionally start.
● Interconnect the Emergency Stop pushbutton with a fail-
safe inverter digital input.
● Select STO via the fail-safe digital input.
A central Emergency Stop button must
prevent the unintentional acceleration
of several motors that are at a stand‐
still.
● Evaluate the Emergency Stop button in a central control.
● Select STO via PROFIsafe.
Description
3.7 An overview of the principle of operation of the safety functions
Safety Integrated - SINAMICS G110M, G120, G120C, G120D and SIMATIC ET 200pro FC-2
Function Manual, 01/2017, FW V4.7 SP6, A5E34261271B AD 33
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