A.2 What is the difference between the Emergency Off and Emergency
Stop functions?
"Emergency Off" and "Emergency Stop" are commands that minimize different risks in the
machine or plant.
Emergency Off
Risk of electric shock.
Emergency Stop
Risk of unexpected motion.
Table A-1 Measures and solutions
Command Emergency Off Emergency Stop
Measure to minimize
risk
Safe switch off
Switching off the electric power supply
for the installation, either completely or
partially.
Safely stop and safely prevent restart‐
ing
Stopping or preventing the dangerous
movement
Classic solution Switch off the power supply. Switch off the drive power supply.
Solution with the
STO safety function
integrated in the
drive
STO is not suitable for safely switching
off a voltage.
Select STO.
It is permissible that you switch off the
converter power supply as well. How‐
ever, switching off the voltage is not
required as a risk-reduction measure.
Appendix
A.2 What is the difference between the Emergency Off and Emergency Stop functions?
SINAMICS S210 servo drive system
Operating Instructions, 12/2017, A5E41702836B AA 745
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