Characteristic Safety Values - Pepperl+Fuchs HiD2022 Series Manual

Functional Safety HiD2022*, KFD2-STC5-(Ex)*, KFD2-STV5-(Ex)*
Planning
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
Assessment type and documentation
Device type
Operating mode
Safety function
HFT
SIL (SC)
1

s
2

dd

du

not part

total (safety function)

total
SFF
PTC
3
MTBF
PFH
PFD for T = 1 year
avg 1
PFD for T = 2 years
avg 1
PFD for T = 5 years
avg 1
4
Reaction time
Table 3.2
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.
2
"Fail high" and "Fail low" failures are considered as dangerous detected failures 
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.
4
Time between fault detection and fault reaction
Characteristic values
FMEDA report
A
Low Demand Mode or High Demand Mode
Transfer of analog signals
0
2
0 FIT
169 FIT
67 FIT
70 FIT
236 FIT
653 FIT
72 %
100 %
175 years
-8
6.72 x 10 1/h
-4
2.94 x 10
-4
5.88 x 10
-3
1.47 x 10
< 100 ms
dd
.
17