STO
–
Safe Torque OFF
Functional description
Operating Manual Rev. 1.3
www.engelantriebe.de
page 12
6.2.3
Switch-off time of the safety function
After both STO channels are de-energised
(0 V
…
V
STO1/2
…
5.0 V), the safety function (disconnection of the PWM pulse
patterns) is guaranteed after a switch-
off time of 20 ms max.
Figure 6-4: STO function switch-off time
Note!
There is no discrepancy time monitoring between the signals STO1 and STO2! This means
that there is no defined time interval within which both STO input signals must have reached
the same switching state.
STO1
0 V
24 V
STO2
0 V
24 V
Status
non-
conductive
conductive
STO active
Normal
operation
Normal
operation
Switch-off time
