Pepperl+Fuchs KFD2-UT2 Series Sil Safety Manual page 11

SAFETY MANUAL SIL KFD2-UT2-(EX)*, HID2082
Planning
HiD2082
Parameters acc. to IEC 61508
Device type
Demand mode
Safety function
HFT
SIL
λ
s
1
λ
dd
2
λ
du
3
λ
no effect
λ
total (safety function)
λ
no part
SFF
4
MTBF
PFD for T = 1 year
avg 1
T max.
proof
1
"Fail high" and "Fail low" failures are considered as dangerous detected failures λ
2
Annunciation failure rates that only influence the diagnostic function were marginal and added to the λ
3
"No effect" failures are not influencing the safety functions and are therefore added to the λ
4
acc. to SN29500. This value includes failures which are not part of the safety function (MTTR = 8 h).
Table 2.2
The characteristic safety values like PFD/PFH, SFF, HFT and T
the SIL report/FMEDA report. Please note, PFD and T
other.
The function of the devices has to be checked within the proof test interval
(T ).
proof
Variables
B
Low Demand Mode
Transfer of analog value
0
2 (proven-in-use acc. to EN 61511)
75 FIT
328.6 FIT
98.1 FIT
312 FIT
814 FIT
43 FIT
87.93 %
133 years
-4
4.30 x 10
2 years
proof
.
dd
.
du
.
s
are taken from
proof
are related to each
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