Functional Safety K*D0-RSH-1.1E.1, HiC5863(Y1)
Planning
20
21
-1
0
13
3.4
Characteristic Safety Values
The characteristic safety values like PFD, PFH, SFF, HFT and T
1
are taken
from the FMEDA report. Observe that PFD and T
1
are related to each other.
The function of the devices has to be checked within the proof test interval (T
1
).
Parameters
Characteristic values
Assessment type and documentation
Full assessment
Device type
A
Mode of operation
Low demand mode or high demand mode
Safety function
ETS
HFT
0
SIL
3
SC
3
s
150 FIT
dd
0 FIT
du
1
1
Only use the device in safety relevant applications with the following termination boards:
FC-GPCS-SDO08-PF
SC-GPCS-UNI16-PF
FC-GPCS-RIO16-PF
HiCTB32-TRI-DOISS-EL-PL-Y1
HiCTB16-TRI-DOISS-EL-PL-Y1
HiCTB16-TRX-RAC-PL-IO16
HiCTB16-YRS-RRB-AK-CC-DO16-Y1
HiCTB16-SDC-24C-SC-RA
HiCTB16-SCT-44C-SC-RA
Generally: Add 2.5 FIT to the overall failure rate for dangerous undetected failures.
Exception for HiCTB16-TRX-RAC-PL-IO16 Termination Board: Add 1.5 FIT to the overall failure rate for dangerous undetected
failures.
Recalculate the necessary safety relevant values for your safety evaluation. Contact Fuchs for information on using
other termination boards.
2.21 FIT
total (safety function)
152 FIT
SFF
2
2
The SFF value was not calculated according to IEC/EN 61508-2.
98.6 %
MTBF
3
3
acc. to SN29500. This value includes failures which are not part of the safety function/MTTR = 8 h.
151 years
MTTF
d
> 2500 years
PTC
100 %
PFH
2.21 x 10
-9
1/h
PFD
avg
for T
1
= 5 years
4.84 x 10
-5
PFD
avg
for T
1
= 10 years
9.7 x 10
-5
T
1
max.
4
4
If the device claims less than 10 % of the signal loop budget, T
1
can be chosen higher.
10 years
Table 3.1
