Siemens SINAMICS G115D Operating Instructions Manual page 237

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