Definition PFD - Probability of failure on demand

Marc

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PFD - Probability of failure on demand

Functional Safety and IEC 61508

Systems comprised of electrical and/or electronic elements have been used for many years to perform safety functions in most application sectors. Computer-based systems (generically referred to as programmable electronic systems) are being used in all application sectors to perform non-safety functions and, increasingly, to perform safety functions.

E.g.: Functional Safety PFH vs PFD

Functional Safety Explained
 
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