Siemens SIMATIC ET 200pro - Page 155

Setting functions
8.8 Safe Torque Off (STO) safety function
SIMATIC ET 200pro FC-2 converter
Operating Instructions, 04/2015, FW V4.7.3, A5E34257324B AB
155
The STO function is suitable to implementing an Emergency Stop, however 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 prevent restarting
Stopping or preventing the potentially
hazardous motion.
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
converter supply voltage as well.
However, this measure to reduce risk
is not specified.