ISO 26262 Part 1 defines Independence as: the absence of dependent failures (both equally CCF and cascading failures) that may cause a multi-point failure violating a safety target. Independence is often a stronger house than FFI – it involves freedom from
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the failure of Yet another aspect – the failures propagate in a series reaction. In contrast to CCF (the place each aspects are unsuccessful from a standard exterior cause), in cascading failures, 1 factor’s failure is the reason for the opposite aspect’s failure.
Dependent Failure Analysis (DFA) is a security analysis approach defined in ISO 26262 Aspect 9, Clause seven that identifies and evaluates failures that are not statistically independent – wherever just one root induce can concurrently affect many components assumed to generally be impartial, likely defeating the redundancy and basic safety mechanisms on which the protection thought relies.
If these independence assumptions are wrong — if just one root bring about can simultaneously disable the two the purpose and its protection mechanism – then the protection strategy is essentially flawed. DFA will be the analysis that validates or invalidates these independence assumptions.
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A shared electric power supply voltage regulator fails – both the principal MCU as well as the checking MCU eliminate ability simultaneously since they both rely on the exact same source.
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Recurring identical situations in various branches on the fault tree reveal dependent failure possible. The DFA analyst should systematically evaluate the FMEA and FTA outputs for these indicators.
A Typical Induce Failure (CCF) happens when two or more things fail at the same time as a result of only one distinct event or root lead to — with out just one component’s failure producing another’s. The failures are
Dependent Failure Analysis (DFA) is the protection analysis that validates the most important assumptions in the here safety architecture – that redundant things are really impartial Which safety mechanisms can't be defeated by dependent failures. By systematically pinpointing coupling aspects, examining both frequent bring about failure and cascading failure possible, and verifying the efficiency of protection measures, DFA gives the proof required to assistance ASIL decomposition, combined-ASIL coexistence, and basic safety system independence claims.
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