torsdag den 19. marts 2009

Revision of the EN5012X suite

Mr. Mairhofer Stefan, Fachhochschule OÖ Campus Wels, has kindly send the interesting information below.

The slides were presented at a workshop regarding upcoming European standards in Brunswick in week 49/2008.

The revision of the EN 50126-suite will be updated by 80 people in Cenelec working group TC9X/WG14 from May 2008 to app. 2011.


As discussed in blogpost Welcome and How are the standards being produced; EN 50126, 128 and 129 have to be interpreted.

The coming revision will try to make the EN 5012X suite more coherent. For the pedantically person, the current versions of EN 50126:1999, EN 50128:2001 and EN 50129:2003 are inconsistent when they are read closely. Some of the issues will be handled in the next revision:

Example 1: EN 50129 states in its scope that it does not cover SIL0 systems while EN 50128 says it covers SIL0 systems.
Example 2: EN 50129 only covers the safety case of signalling systems, but it is used for all types of railway systems (e.g. trains, level crossings, etc.)
Example 3: The determination of a SIL level of a safety function requires long-haired mathematical exercises, which can cause misunderstanding.
Example 4: There are some inconsistency regarding the definitions (e.g. safety critical functions vs. safety functions).
Example 5: The European EN 50126 suite has to be coherent with the worldwide IEC 61508 because of the “Dresden agreement“.

The standards will be compiled into one standard as shown above.

Next chapter >> 8.1 Is the Quick guide on book-form different from this blog?

Focus on the source

Special thanks to Mr. Stephan Griebel, Siemens AG for his informative slides.

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