Position Paper on IEC 61508 2010 Definitions Regarding Minimum Hardware Fault Tolerance

The release of IEC 61508 2010 has led to several discussions on how certain new, updated, and unmodified definitions need to be interpreted. The controversy relates to the determination of the required minimum hardware fault tolerance / architectural constraints interpretation.

This position paper explains the position that exida has taken with regard to this issue. The position paper is structured in two parts; the position and the Rationale for the position including counter arguments received over the last couple of months. The exida position is also implemented in the exida exSILentia safety lifecycle tool.

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