2. Differences with IEC 61508
2.1 Types of downtime considered
Figure 7 compares the types of unavailability covered by IEC 61508 with those covered by the PDS method.
Unlike the PDS method, IEC 61508 does not quantify unavailability related to :
functional testing and preventive maintenance DTU T ;
causes of failure not detectable during P TIF functional testing.
The failure to include a term equivalent to P...
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Differences with IEC 61508
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