Method for fail-safe performance of a safety-related function

摘要

The invention relates to a method for fail-safe performing a safety-related with a first security level, in which a total number (G) of communicating computing systems (500) is provided, each comprising a decision unit, wherein a recognition number (E) to Computing systems represents a number that is at least necessary to automatically a failure number (A), which is at least one, to computing systems in which a function restriction (F) occurs detect using the decision units, if a function restriction (F) occurs in at least one but at most the number of failures (A) of the held computing systems (500), and in the case of a recognized functional restriction (F) the safety-related function is performed with the remaining computing systems, the total number ( G) greater than or equal to a sum of the number of failures (A) and a minimum number (K) is selected, which represents a number of computing systems selected arbitrarily from the held computing systems (500), which are at least necessary to perform the safety-related function with the first security level, and the total number (G) is selected smaller than a product of the recognition number (E) and the minimum number (M), wherein at least one of the held computing systems (500) is operated with a second security level, which is lower than the first security level.