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<p><span lang="EN-GB">This document provides formulas for the estimation of the PFH value of single-channel architectures as well as two-channel architectures with and without diagnostics in accordance with ISO 13849-1. The formulas presented in this document are based on Markov modelling and can be used as an alternative to the simplified procedure of ISO 13849-1 for estimating the quantifiable aspects of the performance level (see ISO 13849-1:2023, 6.1.8, Figure 12, and Annex K). They can also serve as an alternative to any other adequate method for estimating the quantifiable aspects of the performance level.</span></p>
<p><span lang="EN-GB">NOTE Different estimation methods can vary in the resulting PFH values due to their nature. A certain variation is usually the consequence of different modelling approaches and unavoidable simplifications specific to the method.</span></p>
<p><span lang="EN-GB">Other requirements of ISO 13849-1, e.g. on categories or software, are not addressed by this document.</span></p>
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<p><span lang="EN-GB">This document provides formulas for the estimation of the PFH value of single-channel architectures as well as two-channel architectures with and without diagnostics in accordance with ISO 13849-1. The formulas presented in this document are based on Markov modelling and can be used as an alternative to the simplified procedure of ISO 13849-1 for estimating the quantifiable aspects of the performance level (see ISO 13849-1:2023, 6.1.8, Figure 12, and Annex K). They can also serve as an alternative to any other adequate method for estimating the quantifiable aspects of the performance level.</span></p>
<p><span lang="EN-GB">NOTE Different estimation methods can vary in the resulting PFH values due to their nature. A certain variation is usually the consequence of different modelling approaches and unavoidable simplifications specific to the method.</span></p>
<p><span lang="EN-GB">Other requirements of ISO 13849-1, e.g. on categories or software, are not addressed by this document.</span></p>
