STO function with EP7211-0034 (category 3, PL d)
EP7211-0034 - STO Function
12
Version: 1.0.0
3.3
Calculation
3.3.1
PFHD / MTTFD / B10D – values
Component
Value
EL1904 – PFH
D
1.11E-09
EL2904 – PFH
D
1.25E-09
EL6900 – PFH
D
1.03E-09
EP7211-0034 - PFH
D
0.00
S1 – B10
D
1,000,000
S2 – B10
D
2,000,000
Days of operation (d
op
)
230
Hours of operation / day (h
op
)
16
Cycle time (minutes) (T
cycle
)
15 (4x per hour)
Lifetime (T1)
20 years = 175200 hours
3.3.2
Diagnostic Coverage DC
Component
Value
S1/S2 with testing/plausibility
DC
avg
=99%
EL2904 with testing
DC
avg
=99%
3.3.3
Calculation of safety function 1
Calculation of the PFH
D
and MTTF
D
values from the B10
D
values:
From:
*
* 60
op
op
op
Zyklus
d
h
n
T
=
and:
10
0,1*
D
D
op
B
MTTF
n
=
Inserting the values, this produces:
S1:
230 *16 * 60
14720
15
=
=
op
n
1.000.000
679,3
5951087
0,1*14720
=
=
=
D
MTTF
y
h
S2:
230 *16 * 60
14720
15
=
=
op
n
2.000.000
1358,7
11902174
0,1*14720
=
=
=
D
MTTF
y
h
and the assumption that S1 and S2 are each single-channel:
Содержание EP7211-0034
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