By Jean-Louis Boulanger
CENELEC EN 50128 and IEC 62279 criteria are acceptable to the functionality of software program within the railway zone. The 2011 model of the 50128 ordinary organisations up the thoughts and techniques to be applied. it is a consultant to its implementation, to be able to comprehend the rules of the traditional and the way it affects at the actions to be undertaken, assisting in the direction of larger a education for the self reliant overview section, that is mandatory.
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Extra info for CENELEC 50128 and IEC 62279 Standards
Html. Railway Standards 15 – IEC 61508-6: guidelines on the application of IEC 61508-2 and IEC 61508-3; – IEC 61508-7: overview of techniques and measures. ), but the content of IEC 61508 is so complex (or unusual) that it is necessary to be guided through the standard. Thus, interested readers should refer to [ISA 05] or [SMI 07]. In most cases, safety is accomplished by many systems of diverse technologies (mechanical, hydraulic, pneumatic, electrical, electronic, programmable electronics). The safety strategy must take account of all the factors which contribute to safety.
The software is divided into small components – or “modules” – which limits the size and the number of interfaces). ) and a structured method (logic/function block diagrams, sequence diagrams, data flow diagrams, truth tables/ decision tables). With regard to the code, the standard states that it is necessary to choose a programming language which offers easy verification (requiring a minimum level of effort for understanding). The development method and the programming language should make it easy to analyze the code.
Safety versus availability The standards in force describe the processes, methods and tools necessary to attain and demonstrate the required SIL. It is a question of obligatory techniques, which applies in addition to the obligations in force regarding the quantitative and/or qualitative results. At this early stage, we have chosen to focus on safety, because safety is the main aspect of operational fitness which is crucial to analyze. There are few, if any, requirements in terms of reliability or availability which are set out by the normative framework.