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The IEC and ISA standards for Safety Instrumented Systems (SISs) describe basic requirements for Functional Safety Assessments (FSAs) (FSAs), but do not provide specifications or guidance on how to execute or document an FSA. This commonly results in FSAs that are incomplete, hard to use or inconsistent from one application to the next. From an enterprise perspective, this challenge intensifies with multiple functional areas or sites that operate independently.
This paper discusses the requirements for FSAs of SISs and the advantages of using a Protective Systems Safety Lifecycle Manager, such as SLM, as the primary tool for standardizing and assessing.