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Safety Integrity Level

The safety integrity level according to IEC 61508 and IEC 62061, also called SIL, contains three discrete levels which describe the capability of safety relevant components included in a controller to execute a safety function under foreseeable conditions. It can be used to describe safety relevant electrical, electronic and programmable electronic machines. Quantitative assignment of the safety function into the three levels is based on PFHD values.
Safety Integrity Level
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