Pepperl+Fuchs HiD2022 Series Manual page 18

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
HFT
SIL (SC)
Input and output function
1

s
2

dd
3

du

not part

total (safety function)

total
SFF
PTC
4
MTBF
3
PFH
PFD for T = 1 year
avg 1
PFD for T = 2 years
avg 1
PFD for T = 5 years
avg 1
5
Reaction time
Table 3.3
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
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
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.
5
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
18
Characteristic values
FMEDA report
A
Low Demand Mode or High Demand Mode
Transfer of analog signals
0
2
1 output used in safety function
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
-4
4.97 x 10
-3
1.24 x 10
< 100 ms
3
2 outputs used in safety function
0 FIT
328 FIT
9.3 FIT
114 FIT
337 FIT
954 FIT
97.3 %
100 %
119 years
-9
9.27 x 10 1/h
-5
4.06 x 10
-5
8.12 x 10
-4
2.03 x 10
.
dd
are taken from the
1
are related to each other.
1
).
1