Characteristic Safety Values - Pepperl+Fuchs SIL KCD2-STC-1.HC Safety Manual

Safety Manual SIL KCD2-STC-(Ex)1.HC(.SP), HiC2025HC
Planning
2.4

Characteristic Safety Values

Parameters acc. to IEC 61508
Assessment type and documentation
Device type
Mode of operation
HFT
SIL
Safety function
λ
s
λ
dd
λ
du
λ
no effect
λ
total (safety function)
λ
not part
SFF
1
MTBF
PFH
PFD for T = 1 year
avg proof
PFD for T = 2 years
avg proof
PFD for T = 5 years
avg proof
2
Reaction time
1
acc. to SN29500. This value includes failures which are not part of the safety function.
2
Time between fault detection and fault reaction.
Table 2.3
The characteristic safety values like PFD, SFF, HFT and T
SIL report/FMEDA report. Please note, PFD and T
The function of the devices has to be checked within the proof test interval
(T ).
proof
Values
FMEDA report
A
Low Demand Mode or High Demand Mode
0
2
Signal transfer
126.3 FIT
0 FIT
50.3 FIT
228.3 FIT
405 FIT
32.2 FIT
87.58 %
261 years
-8
5.03 x 10 1/h
-4
2.20 x 10
-4
4.41 x 10
-3
1.10 x 10
< 20 ms
are related to each other.
proof
are taken from the
proof
9