Glossary
Operating manual ASP 5001
ID 442181.07
WE KEEP THINGS MOVING
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Glossary
B10d
Specifies the mean number of switch cycles when 10 % of the components involved have dangerously failed.
CCF – Common Cause Failures
Failures due to common causes
Influencing factors that affect several systems simultaneously, e.g. failure of different components due to an
individual event, whereby these failures are not based on a mutual cause.
DC
avg
– average Diagnostic Coverage
Specifies the average probability of revealing errors by a test.
MTTF, MTTF
d
– Mean Time To (dangerous) Failure
Also mean service life
Statistical parameter that is determined by trial and empirical values. Does not specify a guaranteed service
life or guaranteed fault-free time.
PFH, PFH
d
– Probability of a (dangerous) Failure per Hour
PL – Performance Level
Characteristic value (according to EN ISO 13849) for the reliability with which a controller fulfills a safety
function.
SIL – Safety Integrity Level
Safety Integrity Level according to EN62061 or EN61508.