Configuration and Connection Examples 12.2010
6SE7087-6QX70 (Version AM) Siemens AG
2-40 Compendium Motion Control SIMOVERT MASTERDRIVES
In accordance with ISO 13849-1, a minimum of 65 points are required
for SRP/CS from category 2.
The observations stated in subsection 2.4.5.2 "Measures against
comm
on cause failure (CCF) of the safety function" apply.
A sufficient total of 65 points is thus achieved.
Parameter PFH value PL Comment
ACQUIRE 2.47 x 10
-8
/ h e Position switches –S4 and –S5
EVALUATE 2.62 x 10
-9
/ h d Safety switching devices –A2
REACT
4.29 x 10
-8
/ h
d
Switching elements –K1, -K2 and
–K3
Total 7.02 x 10
-8
/ h d < 1x10
-6
/ h
The requirements regarding PL d with Category 3 for the
protective door safety function are thus fulfilled.
2.4.6.2 Supplementary safety function Emergency Stop
The drive mu
st be switched off safely if the Emergency Stop button is
actuated.
The Emergency Stop button is actuated 1x per month.
This safety function can be assessed according to the same principles
described in subsection 2.4.5.1 "Emergency Stop on a converter →
STO".
The saf
ety switching device –A2 plays no role in the Emergency Stop
function and need not therefore be included in the calculation for this
supplementary protective measure.
The switching cycles of –K1 caused by actuation of the door have no
relevant influence on the calculation for this supplementary safety
function.
Measures against
common cause
failure (CCF) of the
safety function
Check of the PFH
value of the safety
functions as a whole
Assumption
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