Markov Models for 2004 Architecture for Safety Related Systems
نویسندگان
چکیده
An advanced safety architecture is the 2 out of 4-system (2oo4). In order to trigger the safety function at least two of the four channels must work correctly. It is said: “A 2oo4-system is 2-failure safe”. In order to classify the quality of a system we calculate different parameters. In the report equations are indicated for PFD for normal and common-cause-failures. Also the Markov-model for a 2oo4-architecture is introduced. We can calculate the MTTF (Mean Time To Failure) of this architecture with this Markov-model. The results are a high availability and a high reliability.
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