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

Functional Safety KCD2-STC-(Ex)1(.SP)(-Y1), HiC2025(Y1)
Planning
3.4

Characteristic Safety Values

Parameters
Assessment type
Device type
Mode of operation
HFT
SIL
Safety function

s

dd

du

no effect

total (safety function)

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
Table 3.3
1
acc. to SN29500. This value includes failures which are not part of the safety function/MTTR = 8 h.
2
Time between fault detection and fault reaction
The characteristic safety values like PFD, SFF, HFT and T
the SIL report/FMEDA report. Observe that PFD and T
The function of the devices has to be checked within the proof test interval (T
Characteristic values
Full assessment
A
Low demand mode or high demand mode
0
2
Signal transfer
122 FIT
172 FIT
45 FIT
122 FIT
338 FIT
72 FIT
86.8 %
278 years
-8
4.45 x 10 1/h
-4
1.95 x 10
-4
3.90 x 10
-4
9.74 x 10
< 20 ms
are taken from
1
are related to each other.
1
).
1
13