
Safety functions (only for controls with integrated safety technology)
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Safety functions (only for controls with integrated safety technology)
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Operating manual [27779165/EN] - EMS modular controls
10.2
Safety function description
10.2.1
STO (safe torque off)
STO safety function ensures the torque at the respective axis drive is switched off im-
mediately by deactivating the energy supply. When the STO function is active, it is not
possible for the converter to supply torque-generating energy to the drive, thus prevent-
ing the axis from restarting unexpectedly.
This safety function corresponds to stop category 0 (non-regulated stop) according to
EN 60204-1.
Fig. 10-1 Graphic representation of the STO safety function
ITEM
Description
STO activation
STO function activated (1 or HIGH). The axis is de-energized / Axis
torque is switched off.
t
0
Movement at starting speed
t
1
STO activation time