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Consideration on the basis of DIN EN 61508 (DIN EN 61062)
Using the following formula, the PFH or λ
system without diagnosis (1oo1) is concerned, the following relationship applies:
1
PFH = λ
=
d
MTTF
PFH
= Probability of a failure to danger in FIT [1 x 10
λ
= Dangerous failure rate in FIT [1 x 10
d
FIT
= Failures in time (number of failures in 10
For the example above, the following applies to the calculation of the PFH and the λ
0,1
PFH = λ
=
d
250000
This corresponds to 241.1 failures in 10
can be calculated following DIN EN 61508. Since a single-channel
d
0,1
=
× n
op
B
d
10d
1
10
× 5280
×
a
d
365
a
9
hours.
-9
/ hour]
-9
/ hour]
9
hours)
9
h
= 241,1 FIT
h
× 24
d
Safety Manual
in FIT:
d
a = Years
d = Days
h = Hours
s = Seconds
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