Pepperl+Fuchs KFD2-STC4-Ex Series User Manual

Safety Manual SIL KFD2-ST*4-(Ex)*, KFD2-CR4-(Ex)*
Planning
2014-09
11
KFD2-CR4-(Ex)1.2O, KFD2-STC4-(Ex)1.2O, KFD2-STC4-(Ex)1.2O-3,
KFD2-STC4-(Ex)1.2O-Y*, KFD2-STV4-(Ex)1.2O-1, KFD2-STV4-(Ex)1.2O-2
Parameters acc. to IEC 61508 Values
Assessment type FMEDA report
Device type A
Demand mode Low Demand Mode or High Demand Mode
Safety function
2
Transfer of analog values
HFT 0
SIL 2 3
Input and output function Input Output Single output
used in safety
function
Both outputs used
in safety function

s
120 FIT 144 FIT 264 FIT 670.2 FIT

dd
1
71.6 FIT 95.3 FIT 166.9 FIT 85.4 FIT

du
14.4 FIT 43.8 FIT 57.2 FIT 16.6 FIT

no effect
2
120 FIT 144.1 FIT 264 FIT 408 FIT

not part
107 FIT 205 FIT 312 FIT 517 FIT

total (safety function)
206 FIT 284 FIT 490 FIT 774 FIT
SFF 88 % 97 %
MTBF
3
142 years 147 years
PFH
4
5.72 x 10
-8
1/h 1.66 x 10
-8
1/h
PFD
avg
for T
proof
= 1 year 2.50 x 10
-4
7.26 x 10
-5
PFD
avg
for T
proof
= 2 years 5.01 x 10
-4
1.45 x 10
-4
PFD
avg
for T
proof
= 5 years 1.25 x 10
-3
3.63 x 10
-4
1
"Fail high" and "Fail low" failures are considered as dangerous detected failures 
dd
.
2
"No effect" failures are not influencing the safety functions and are therefore added to the 
s
.
3
acc. to SN29500. This value includes failures which are not part of the safety function.
4
The safety characteristic values were calculated considering a common cause factor of 5 % for the safety
relevant output part. For the application with both outputs in the safety function, the ESD system needs to
evaluate if the outputs differ by more than 2 %.
Table 2.3
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Pepperl+Fuchs KFD2-STC4-Ex Series Specifications

General

Brand	Pepperl+Fuchs
Model	KFD2-STC4-Ex Series
Category	Power Supply
Language	English