FMEDA - For quantitative detection

FMEDA refers to a process for the detailed investigation of causes and their effects on the system. It can already be used in the early phases of system development efficiently detect early to vulnerabilities. With the FMEDA the Safe Failure Fraction (SFF) and the diagnostic coverage (DC) of a system is determined according to the requirements of the IEC 61508 or ISO 26262.

FMEDA considers the following aspects:

  • All designcomponents
  • Ability of automatic diagnostics for failure detection
  • Design strength (de-rating, safety factors)
  • Effect of each component failure mode on the product functionality
  • Functionality of each component
  • Failure modes of each component
  • Operational profile (environmental stress factors)


FMEDA happens in 5 steps:

  • Identification of all components relevant to the safety function and determination of the associated error rates
  • Identification of the potential types of errors and distribution of the component error rate
  • Determination of the effect of the individual types of error on the safety function and classification as "safe failure" or "dangerous failure".
  • Determining the diagnostic coverage for types of errors that lead to potentially dangerous failures.
  • Calculation of SFF and DC for the system from the obtained data

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