Pepperl+Fuchs KFD2-SH-Ex1 Original Instructions Manual page 15

Functional Safety KFD2-SH-Ex1(.T)(.OP), KHA6-SH-Ex1
Planning
KFD2-SH-Ex1.T(.OP)
Parameters acc. to IEC 61508
Assessment type and
documentation
Device type
Mode of operation
HFT
SIL
Safety function

s

du

dd
1

no effect

total (safety function)
SFF
2
MTBF
MTTF
d
DC
d
B10
d
Category (ISO 13849-1)
PL
PFH
PFD for T = 1 year
avg 1
PFD for T = 2 years
avg 1
PFD for T = 5 years
avg 1
3
Reaction time
Table 3.3
1
"Annunciation failures" are not directly influencing the safety functions and are therefore added to the 
value.

no effect
2
acc. to SN29500. This value is calculated with the failure rates of the device components which are part of the
safety function of the device.
3
Time between fault detection and fault reaction.
The characteristic safety values like PFD, PFH, SFF, HFT and T
the FMEDA report and the assessment documentation created by the issuer.
Please note, PFD and T
has to be checked within the proof test interval (T
The safety values MTTF
taken from the assessment report and certificate.
Characteristic values
FMEDA, proven-in-use assessment, certificate
A
Low Demand Mode or High Demand Mode
0
3 (proven-in-use)
Output I is de-energized when
input in low state
181 FIT
1.4 FIT
38.4 FIT
195 FIT
218 FIT
99.4 %
275 years
2860 years
96.5 % (medium)
–
3
d
-9
1.38 x 10 1/h
-6
6.04 x 10
-6
1.21 x 10
-5
3.02 x 10
< 30 ms
are related to each other. The function of the devices
1
, DC , Category and PL for the machinery directive are
d d
2 (proven-in-use)
Output II is de-energized when
input in low state
194 FIT
51.6 FIT
38.4 FIT
130 FIT
282 FIT
81 %
276 years
–
–
–
–
–
-8
5.16 x 10 1/h
-4
2.26 x 10
-4
4.52 x 10
-3
1.13 x 10
< 30 ms
are taken from
1
).
1
15