Siemens SINAMICS G110M - 8.15 Safe Torque Off (STO) safety function

Functions
8.10 Safe Torque Off (STO) safety function
SINAMICS G110M Operating Instructions
244 Operating Instructions, 04/2015, FW V4.7.3, A5E31298649B AD
The STO inverter function complies with what is defined in the standard.
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: Risk of electric shock:
Risk of unexpected motion:
Measure to minimize
risk:
Safe switch off
Switching off the electric power sup-
ply for the installation, either com-
pletely or partially.
Safely stop and safely prevent re-
starting
Stopping or preventing the dangerous
movement
Command:
Emergency Off
Emergency Stop
Classic solution: Switch of the power supply:
Switch-of the drive power supply:
Solution with the STO
safety function inte-
grated in the drive:
STO is not suitable for safely switch-
ing of an electric voltage.
Select STO:
It is permissible that you switch of the
inverter supply voltage as well. How-
ever, switching off the voltage is not
required as a risk-reduction meas-
urement.