Siemens 6SN1123-1AA00-0DA2 Configuration Manual page 358

02.12
05.01
Table 9-5
EMERGENCY STOP pushbutton –S3
B10 value
Percentage of dangerous
failures
B
n
MTTF
DC
Result
PFH
Performance Level
EVALUATE subsystem
In this example, the EVALUATE subsystem is implemented in the form of a SI-
RIUS 3TK3827 safety relay. The safety relay has instantaneous and delayed
electromechanical enable circuits.
Table 9-6
Safety relay 3TK2827 –A1
PFH
Service life
Instantaneous enable circuit
Performance Level
Delayed enable circuit
Performance Level
Result
PFH
Performance Level
RESPOND subsystem
The RESPOND subsystem has a two channel structure. The first channel is
implemented using safety relay –K1. The line contactor in the line infeed forms
the second channel. Both channels are simultaneously controlled from safety
relay –A1. The positively opening NC contacts of the contactor and relay are
tested as feedback signal contacts by –A1 at each start.
© Siemens AG 2012 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
Parameters for the SENSE subsystem
Parameter
100.000
20 %
value 500.000
10d
12 per year
op
416.666 years
d
→ high
99 %
4,29 x 10
d
PLe
Parameters for the EVALUATE subsystem
Parameter
2,7 x 10
d
T1 = 20 years
PLe
PLd
2,7 x 10
d
PLd
9 Cabinet Design and EMC
9.4 Application examples
Value Comment
Manufacturer's data
Manufacturer's data
B10
B10 =
d
percentage of dangerous failures
assumed actuations per year
B
10d
MTTF =
d
0,1 x n
Plausibility monitoring using –A1
-8
/h EN ISO 13849–1:2008, Anhang K
with Category 3
Value Comment
-9
/h Manufacturer's data
Manufacturer's data
with Category 4
with Category 3
-9
/h PFH = PFH (–A1)
d d
with Category 3
op
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