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Functional Safety KFD0-SD2-Ex2.1*45
Planning
3.4
Characteristic Safety Values
Parameters
Assessment type and
documentation
Device type
Mode of operation
HFT
SIL
SC
Safety function
s
dd
du
total (safety function)
not part
SFF
PTC
1
MTBF
PFH
PFD
for T
= 1 year
avg
1
PFD
for T
= 2 years
avg
1
PFD
for T
= 5 years
avg
1
2
Reaction time
Table 3.1
KFD0-SD2-Ex2.1*45 in 1oo1 structure
1
acc. to SN29500. This value includes failures which are not part of the safety function/MTTR = 8 h.
The value is calculated for one safety function of the device.
2
Time between fault detection and fault reaction
The characteristic safety values like PFD, PFH, SFF, HFT and T
from the FMEDA report. Observe that PFD and T
The function of the devices has to be checked within the proof test interval (T
Characteristic values
Full assessment
A
Low demand mode oder high demand mode
0
3
3
Output is de-energized
135 FIT
0 FIT
0.08 FIT
135 FIT
302 FIT
99,94 %
66 %
184 years
-11
8,00 x 10
1/h
-6
1,43 x 10
-6
2,85 x 10
-6
7,13 x 10
< 1000 ms
are taken
1
are related to each other.
1
).
1
11
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