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International Standard IEC 61508
Functional safety of electrical / electronic / programmable electronic safety related systems
Year: 1998, 2000, 2002, 2010
Part 1: General requirements
Part 2: Requirements for electrical/electronic/programmable electronic safety-related systems
Part 4: Definitions and abbreviations
Part 5: Examples of methods for the determination of safety integrity levels
Part 6: Guidelines on the application of IEC 61508-2 and IEC 61508-3