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Summary
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IEC 61511 Ed 2 is largely based on IEC 61508 route 2H.
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FDIS currently scheduled for vote during 2015.
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Hardware fault tolerance requirements defined without the need to calculate the safe failure
fraction.
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Requirements directly related to IEC 61508 assessed element / devices are not duplicated in IEC
61511, but must still be met.
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Some changes are likely to occur between the CDV and FDIS versions to comply with IEC Guide
104.