Pepperl+Fuchs HiD2022 Series - Characteristic Safety Values

Functional Safety HiD2022*, KFD2-STC5-(Ex)*, KFD2-STV5-(Ex)*
Planning
2017-09
17
3.4 Characteristic Safety Values
KFD2-STC5-1, KFD2-STC5-Ex1, KFD2-STC5-Ex1.H, KFD2-STV5-1-1,
KFD2-STV5-Ex1-1, KFD2-STV5-Ex1-2
HiD2022, HiD2022SK, KFD2-STC5-2, KFD2-STC5-Ex2, KFD2-STV5-2-1,
KFD2-STV5-Ex2-1, KFD2-STV5-Ex2-2
Parameters acc. to IEC 61508 Characteristic values
Assessment type and documentation FMEDA report
Device type A
Operating mode Low Demand Mode or High Demand Mode
Safety function Transfer of analog signals
HFT 0
SIL (SC) 2

s
1
1
"No effect failures" are not influencing the safety function and are therefore not included in SFF and in the
failure rates of the safety function.
0 FIT

dd
2
2
"Fail high" and "Fail low" failures are considered as dangerous detected failures 
dd
.
169 FIT

du
67 FIT

not part
70 FIT

total (safety function)
236 FIT

total
653 FIT
SFF 72 %
PTC 100 %
MTBF
3
3
acc. to SN29500. This value includes failures which are not part of the safety function/MTTR = 24 h. The
value is valid for one safety loop only.
175 years
PFH 6.72 x 10
-8
1/h
PFD
avg
for T
1
= 1 year 2.94 x 10
-4
PFD
avg
for T
1
= 2 years 5.88 x 10
-4
PFD
avg
for T
1
= 5 years 1.47 x 10
-3
Reaction time
4
4
Time between fault detection and fault reaction
< 100 ms
Table 3.2