Table Of Contents - Abb Ac500-S Application Note

Application Note for "Usage of AC500 digital standard I/Os in functional safety applications up to PL c (ISO 13849-1)", V1.0.0
Contents
1 Introduction _____________________________________________________ 3
1.1 Purpose ............................................................................................................................. 3
1.2 Document history ............................................................................................................... 4
1.3 Validity ............................................................................................................................... 4
1.4 Important user information .................................................................................................. 4
1.5 Definitions, expressions, abbreviations ............................................................................... 4
1.6 References / Related documents ........................................................................................ 5
2 Usage of digital standard I/Os in functional safety applications up to PL c _____ 6
2.1 Overview ............................................................................................................................ 6
2.2 Task ................................................................................................................................... 8
2.3 Solution .............................................................................................................................. 8
3 Example ______________________________________________________ 14
3.1 General ............................................................................................................................ 14
3.2 Safety function ................................................................................................................. 14
3.3 Functional description....................................................................................................... 15
3.4 Design features ................................................................................................................ 16
3.4.1 Implementation details
3.4.2 Common cause failures
3.4.3 Systematic failures
3.4.4 Safety function response time
3.5 Calculation of the probability of failure and correspondence to PL (ISO 13849-1) .............. 20
4 Conclusion _____________________________________________________ 23
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