Characteristic Safety Values - Pepperl+Fuchs HiD2872 Manual

Functional Safety HiD2872, HiC2873(Y1), HiD2876, HiC2877
Planning
3.4

Characteristic Safety Values

SIL 3 Application (Loop Powered)
Parameters
Assessment type
Device type
Mode of operation
Safety function
HFT
SIL
SC

s

dd

du

total (safety function)

no effect
SFF
1
MTBF
2
PFH
2
PFD for T = 1 year
avg 1
2
T max.
1
PTC
3
Reaction time
Table 3.1
1
acc. to SN29500. This value includes failures which are not part of the safety function/MTTR = 24 h.
The value is calculated for one safety function of the device.
2
As the  failure rate is 0 FIT, a PFD calculation yields a PFD of zero, independent from the proof test interval.
d
3
Time between fault occurence and fault reaction
Characteristic values
FMEDA report
A
Low demand mode, high demand mode or continuous mode
De-energized if the input is in low condition
0
3
3
127 FIT
0 FIT
0 FIT
127 FIT
131 FIT
100 %
293 years
0 1/h
0
Defined in "Proof Test" chapter but not necessary to validate
the safety values, see chapter 5.1.
100 %
< 100 ms
13