Siemens 6SN1123-1AA00-0DA2 Configuration Manual page 365

9 Cabinet Design and EMC
9.4 Application examples
Safety function, protective door
Assumption
9-364
If the protective door is opened, the drive should be safely stopped and after a
safely monitored time, should be shut down.
In two–shift operation, the protective door is opened every 10 min. The plant is
operational from Monday to Friday. The number of actuations is as follows:
6 • 1/h • 16 h/d • 260d = 24960 per yearh.
–S4
–A2
–S5
Fig. 9-17 Block diagram of the safety function, protective door
Safety relay –A1 is used for the diagnostics of –K2, –K3 and –K5. It is not inclu-
ded in the calculation for the protective door safety function.
SENSE subsystem
The protective door is monitored using two independent position switches –S4
and –S5. Both position switches have a positively opening contact.
Table 9-11 Parameters for the SENSE subsystem
Parameter
Position switches –S4 and –S5
B10 value 10.000.000
Percentage of 20 %
dangerous failures
B value 50.000.000
10d
n 24960 per years
op
MTTF 20.032 years,
d
capped to 100
years
DC 99 %
Intermediate results, RESPOND (channels 1 and 2)
100 years →
MTTF (RESPOND)
d
high
90 % → average DC
DC
avg
Ergebnisse ERFASSEN
PFH 2,47 x 10
d
Performance Level PLe
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
–A1
–K4 –K3
–A3
–K1
–K6
Value
Manufacturer's data
Manufacturer's data
B10 =
d
Percentage of dangerous failures
assumed actuations per year
B
MTTF =
d
0,1 x n
Plausibility monitoring using –A2
MTTF values for both channels were
d
capped at 100 years → it is not necessary
to symmetrize both channels
= DC (channel 1) = DC (channel 2)
avg
-8
/h EN ISO 13849–1:2008, Annex K
with Category 4
© Siemens AG 2012 All Rights Reserved
02.12
05.01
–A1 –A1
–K5 –K2
Comment
B10
10d
op