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Proven in use

Basis for use of a component or system as part of a safety integrity level (SIL) rated safety instrumented system (SIS) that has not been designed in accordance with IEC 61508. It requires sufficient product operational hours, revision history, fault reporting systems, and field failure data to determine if the is evidence of systematic design faults in a product. IEC 61508 provides levels of operational history required for each SIL.


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