CONTENTS INTRODUCTION 1 Scope 2 Normative references 3 Functional safety 3.1 What is functional safety? 3.2 Safety functions and safety-related systems 3.3 Example of functional safety 3.4 Challenges in achieving functional safety 4 IEC 61508 – Functional safety of E/E/PE safety-related systems 4.1 Objectives 4.2 E/E/PE safety-related systems 4.3 Technical approach 4.4 Safety integrity levels 4.5 Example of functional safety revisited 4.6 Parts framework of IEC 61508 4.7 IEC 61508 as a basis for other standards 4.8 IEC 61508 as a stand-alone standard 4.9 Further information Annex A List of frequently asked questions from IEC Functional Safety Zone Figures Figure 1 — Requirements map for parts 1 to 7 of IEC 61508 Tables Table A.1 — List of frequently asked questions

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