4. Technical specificationsFunctional safety engineering
Festo.P.BE-CMMS-ST-HW-EN 0903b
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and error resolution.
Timing diagram: activating the STO function
Controller
release
Drive is moving
1
0
1
0
1
0
1
0
1
0
Output stage release
1
0
ty
t1
1
0
DOUT0 : READY
UZK+
Holding brake
current-carrying
Motor controlled
t1
=1.6 ms (controller cycle time)
ty
= x ms (dependent on set switch-off delay)
Fig. 4.1 Behaviour when the end stage enable is switched off
Note
If external forces (e.g. hanging loads) have an effect on the drive,
additional measures (e.g. mechanical brakes) are necessary to
avoid hazards.
The Safe Stop 1 stop function (SS1), in which the drive is brought
to standstill in a controlled manner, is then always preferred.