The ISA 84 (IEC 61511) standard on safety instrumented systems (SISs) in the process industries states that assessments and audits are required to determine that functional safety has been achieved and maintained.
The ISA 84 (IEC 61511) standard on safety instrumented systems (SISs) in the process industries states that assessments and audits are required to determine that functional safety has been achieved and maintained. There are a variety of stages along the overall lifecycle set of activities where assessments may be performed; one required stage occurs directly after commissioning. The primary purpose of the life cycle is to define and document the activities needed to ensure functional safety (Fig. 1).
Fig. 1. A full description of the life cycle, which defines and documents the activities required to ensure functional safety, appears in various ISA standards. Clause numb
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