The distinction between Emergency O and Emergency Stop
"Emergency O" and "Emergency Stop" are commands that minimize dierent risks in the
machine or plant.
The STO function is suitable for achieving an emergency stop but not an emergency o.
Risk: Risk of electric shock: Risk of unexpected motion:
Measure to minimize
risk:
Safe switch o
Switching o the electric power supply
for the installation, either completely
or partially.
Safely stop and safely prevent re‐
starting
Stopping or preventing the dangerous
movement
Command: Emergency O Emergency Stop
Classic solution: Switch o the power supply: Switch o the drive power supply:
Solution with the STO
safety function inte‐
grated in the drive:
STO is not suitable for safely switching
o an electric voltage.
Select STO:
It is permissible that you switch o the
converter supply voltage as well. How‐
ever, switching o the voltage is not
required as a risk-reduction measure‐
ment.
Advanced commissioning
7.15Safe Torque O (STO) safety function
SINAMICS G115D Wall Mounted distributed drive
Operating Instructions, 07/2023, FW V4.7 SP14, A5E52808211A AA 235
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