many people confused. IEC standard 61511 defines a safety instrumented function as a “safety function with a specified safety integrity level which is necessary to achieve functional safety. A safety instrumented function can be either a safety instrumented protection function or a safety instrumented control function.” A safety function is further defined in 61511 as a “function to be implemented by a SIS, other technology safety-related system, or external risk reduction facilities, which is intended to achieve or maintain a safe state for the process, with respect to a specific hazardous event.” The standard 61511, however, uses the terms SIS and SIF somewhat interchangeably
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