Characteristic Safety Values - Pepperl+Fuchs KFD2-UT2 Series Sil Safety Manual

SAFETY MANUAL SIL KFD2-UT2-(EX)*, HID2082
Planning
2.4

Characteristic Safety Values

The following tables contain no data for the SFF, since this performance value has
to be calculated with consideration of the connected field device.
KFD2-UT2-(Ex)*
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 2.1
10
Variables
B
Low Demand Mode
Transfer of analog value
0
2 (proven-in-use acc. to EN 61511)
0 FIT
333 FIT
79.2 FIT
295 FIT
706 FIT
33.4 FIT
88.78 %
154 years
-4
3.74 x 10
2 years
.
dd
.
du
.
s