Pepperl+Fuchs HiD2022 Series Manual page 16

Functional Safety HiD2022*, KFD2-STC5-(Ex)*, KFD2-STV5-(Ex)*
Planning
KFD2-STC5-1.2O, KFD2-STC5-Ex1.2O, KFD2-STC5-Ex1.2O.H,
KFD2-STV5-Ex1.2O-1, KFD2-STV5-Ex1.2O-2
Parameters acc. to IEC 61508
Assessment type and
documentation
Device type
Operating mode
Safety function
Input and output function
HFT
SIL
SC

s
1

low

du

not part

total (safety function)

total
SFF
PTC
2
MTBF
3
PFH
3
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 3.3
1
"Fail low" failures are considered as dangerous detected failures 
2
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.
3
The safety characteristic values were calculated considering a common cause factor  of 5 % for the safety relevant output part.
For the application with 2 outputs in the safety function, the ESD system needs to detect if the outputs differ by more than 2 %.
4
Time between fault detection and fault reaction
The characteristic safety values like PFD, SFF, HFT and T
SIL report/FMEDA report. Observe that PFD and T
The function of the devices has to be checked within the proof test interval (T
16
Characteristic values
Full assessment
A
Low Demand Mode or High Demand Mode
Transfer of analog signals
1 output used in safety function
0
2
3
0 FIT
177 FIT
57 FIT
72 FIT
234 FIT
660 FIT
80 %
100 %
173 years
-8
5.67 x 10 1/h
-4
2.48 x 10
3 -4
4.97 x 10
3 -3
1.24 x 10
< 100 ms
2 outputs used in safety function
3
0 FIT
328 FIT
9.3 FIT
114 FIT
337 FIT
954 FIT
97.3 %
100 %
119 years
9.27 x 10
4.06 x 10
8.12 x 10
2.03 x 10
.
dd
are taken from the
1
are related to each other.
1
-9
1/h
-5
-5
-4
).
1