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Certification
The standard defines the analysis, design, implementation, production and test requirements for safety related systems in accordance to the Safety Integrity Level (SIL) assigned to the system. The SIL is assigned according to the risks associated with the use of the system under development, with a maximum SIL of 4 being assigned to systems with the highest perceived risk. The higher the assigned SIL number the lower the rate of failure must be for all identified unsafe failure modes. IEC 61508 is made up of seven parts. Primary information is contained in parts one to three. Supplementary material is contained in parts four to seven. All seven parts together define a system development safety lifecycle. Summary of parts one to three:
Software Certification Systematic failures are not generally quantifiable, and cannot be mitigated using the same techniques as used to mitigate the risk of random hardware failures. Instead, systematic failures are mitigated through the implementation of rigorous and process driven analysis, specification, design, realisation and test techniques. The affect of such mitigations are also not generally quantifiable, so to credibly claim compliance with IEC 61508 it is necessary to have your development process and compliance evidence assessed by a third party who is accepted as an expert in the field.
Compiler VerificationRead the Embedded.com article describing how SafeRTOS ensures compliance with the IEC 61508 requirements for certified translation tools, and how this simplifies the certification of your end product.
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