Automotive Safety Integrity Level
For functional safety, it is compulsory to classify its Safety Integrity Level (SIL) based on hazard analysis and risk assessment.
Different functional safety could have different level integrity level. For example, in automotive industry, its SIL classification scheme is called Automotive Safety Integrity Level (ASIL).
ASIL has five levels, from the lowest to the highest, QM and ASIL A/B/C/D. ASIL D represents the highest degree of automotive hazard and highest degree of rigor applied in the assurance the resultant safety requirements whereas QM represents application with no automotive hazards and, therefore, no safety requirements to manage under the ISO 26262 safety processes.
In some scenarios, high-level functional safety is decomposed into multiple low-level functional safety components in the implementation in practice. Functional safety (and ASIL) decomposition is a key concept in designing a functional safety system.
The ASIL decomposition is not covered within the ISO 26262 standard is often an uncommon and misunderstood concept.
Find out more about the basics of ASIL & ASIL Decomposition, the rules behind the decomposition and some common misconceptions in this presentation.
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