This international standard gives reqirements for the specification, design, installation, operation and maintenance of a safety instrumented system, so that it can be confidently entrusted to place and/or maintain the processin a safe state.
The function of an industrial safety instrumented system SIS is to automatically shutdown the process if a dangerous condition is detected. Although different kinds of equipment are used, there is a strong trend towards the use of programmable electronic equipment (processor based logic). For these systems to be certified for use inn certain types of safety applications, they must meet the standards IEC 61508 and ANSI/ISA 84.01 for functional safety.
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Figure: Relationship between IEC 61511 and IEC 61508