The 2010 Version of IEC 61508
The following is a brief summary of the main changes which brought about the 2010 version.
Architectural Constraints (Chapter 3)
An alternative route to the “safe failure fraction” (the so-called route 1H) requirements was introduced (known as Route 2H).
Route 2H allows the “safe failure fraction” requirements to lapse providing that amount of redundancy (so-called hardware fault tolerance) meets a minimum requirement AND there is adequate user-based information providing failure rate data.
The meaning of “safe” failures in the formula for safe failure fraction was emphasized as referring only to failures which force a “safe” state (e.g., spurious trip).
Security (Chapter 2)
Malevolent and unauthorized actions, as well ...
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