Characteristic Safety Values - Pepperl+Fuchs HiD2035 Manual

Functional Safety HiD2035, HiD2036
Planning
3.4

Characteristic Safety Values

HiD2035, HiD2036, 1oo1 Structure
Parameters acc. to IEC 61508
Assessment type and documentation
Device type
Mode of operation
HFT
SIL (SC)
Safety function
1
+ 

sd su

dd
1

du

total (safety function)

not part
SFF
PTC
2
MTBF
PFH
PFD for T = 1 year
avg 1
PFD for T = 2 years
avg 1
PFD for T = 5 years
avg 1
Reaction time
Table 3.1
1
"Not considered" failures are considered 50 % as dangerous undetected and 50 % as "No effect". "No effect"
failures are not influencing the safety functions and are therefore not included in the calculation of the SFF.
2
acc. to SN29500. This value includes failures which are not part of the safety function/MTTR = 8 h. This value
is calculated for one safety function of a device.
The characteristic safety values like PFD, SFF, HFT and T
SIL report/FMEDA report. Observe that PFD and T
The function of the devices has to be checked within the proof test interval (T
12
Characteristic values
FMEDA report
A
Low Demand Mode or High Demand Mode
0
2
Current transfer from the field side to the control
side
0 FIT
124 FIT
71 FIT
194 FIT
0 FIT
63 %
100 %
298 years
-8
7.06 x 10 1/h
-4
3.09 x 10
-4
6.18 x 10
-3
1.54 x 10
< 100 ms
are related to each other.
1
are taken from the
1
).
1