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Architectural constraints:
Random hardware failures:
Probability of failure on demand:
Probability of Dangerous failure on
safety function:
Hardware safety integrity
[1]
compliance
Systematic safety integrity
compliance
Systematic Capability
Overall SIL-capability achieved
07/17
SM87PB Pushbutton
Safety Function of SM87PB Push Button:
'To raise the alarm upon pushing the button'
Type A
HFT=0
SFF= 79.7%
= 0
DD
= 3.43E-08
DU
PFD
=1.50E-04
AVG
(Low Demand Mode)
PFH = 3.43E-08
(High Demand Mode)
Proof Test Interval
=8760Hrs
MTTR = 8 Hrs
= 0
SD
= 1.34E-07
SU
Route 1
H
Route 1
S
SC2
SIL 2 (Low Demand)*
SIL 2 (High Demand)*
*Limited to SIL 2 due to SFF value
SIL2
SIL3
SIL3
© Eaton MEDC Ltd 2017
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