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This part of IEC 61511 gives requirements for the specification, design, installation, operation and maintenance of a safety instrumented system (SIS), so that This part of IEC 61511 gives requirements for the specification, design, installation, operation and maintenance of a safety instrumented system (SIS), so that Part 2: Guidelines in the application of IEC 61511-1 – Informative. Part 3: Guidance for the determination of the required safety.IEC 61511-1:2016 Functional safety – Safety instrumented systems for the process industry sector – Part 1: framework, definitions, system, hardware and IEC 61511-1. Edition 2.1 2017-08. CONSOLIDATED. VERSION. Functional safety – Safety instrumented systems for the process industry sector –. 61511-1. First edition. 2003-01. Functional safety –. Safety instrumented systems for the process industry sector –. Part 1: Framework, definitions, system,.