Pepperl+Fuchs KCD2-SR-1.LB - Characteristic Safety Values

Safety Manual SIL KCD2-SR-(Ex)*(.LB)(.SP), HiC282*
Planning
2014-09
9
Reaction Time
The reaction time for all safety functions is < 20 ms.
2.4 Characteristic Safety Values
The characteristic safety values like PFD, SFF, HFT and T
proof
are taken from the
SIL report/FMEDA report. Please note, PFD and T
proof
are related to each other.
The function of the devices has to be checked within the proof test interval
(T
proof
).
Note!
The failure outputs are not safety relevant.
Parameters acc. to IEC 61508 Values
Assessment type and
documentation
Full assessment
Device type A
Mode of operation Low Demand Mode or High Demand Mode
HFT 0
SIL 2
Safety function One relay output of one channel Two relay outputs of a one
channel device in series

s
189 FIT 216 FIT

dd
18 FIT 48 FIT

du
47 FIT 45 FIT

no effect
89 FIT 90 FIT

total (safety function)
254 FIT 309 FIT

not part
58 FIT 58 FIT
SFF 81.55 % 85.4 %
MTBF
1
365 years 311 years
PFH 4.68 x 10
-8
1/h 4.51 x 10
-8
1/h
PFD
avg
for T
proof
= 1 year 2.05 x 10
-4
1.97 x 10
-4
PFD
avg
for T
proof
= 2 years 4.10 x 10
-4
3.95 x 10
-4
PFD
avg
for T
proof
= 5 years 1.02 x 10
-3
9.86 x 10
-4
Reaction time
2
< 20 ms
1
acc. to SN29500. This value includes failures which are not part of the safety function.
2
Time between fault detection and fault reaction.
Table 2.3