Characteristic Safety Values - Pepperl+Fuchs KCD2-SR Series Manual

Functional Safety KCD2-SR-(Ex)*(.LB)(.SP), HiC282*
Planning
3.4

Characteristic Safety Values

Parameters
Assessment type and
documentation
Device type
Mode of operation
HFT
SIL (SC)
Safety function

s

dd

du
1

total (safety function)

not part
1
SFF
PTC
2
MTBF
PFH
PFD for T = 1 year
avg proof
PFD for T = 2 years
avg proof
PFD for T = 5 years
avg proof
3
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
acc. to SN29500. This value includes failures which are not part of the safety function/MTTR = 8 h. The value is calculated
for one safety function of the device.
3
Time between fault detection and fault reaction
The characteristic safety values like PFD, SFF, HFT and T
from 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
14
Characteristic values
Full assessment
A
Low Demand Mode or High Demand Mode
0
2
1 relay output for 1 channel
99 FIT
18.2 FIT
40.3 FIT
158 FIT
58 FIT
74.5 %
100 %
366 years
-8
4.03 x 10 1/h
-4
1.93 x 10
-4
3.85 x 10
-4
5.77 x 10
< 20 ms
2 relay outputs for a
1-channel device
126 FIT
47.5 FIT
11.1 FIT
184 FIT
58 FIT
93.99 %
100 %
310 years
-8
1.11 x 10 1/h
-5
5.34 x 10
-4
1.06 x 10
-4
1.59 x 10
are taken
1
are related to each other.
1
).
1