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 companies up the concepts and strategies to be carried out. it is a consultant to its implementation, so as to comprehend the principles of the normal and the way it affects at the actions to be undertaken, supporting in the direction of greater a education for the autonomous evaluate section, that's mandatory.
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Extra info for CENELEC 50128 and IEC 62279 Standards
The first step is to conduct a rigorous needs analysis. The studies relating to operational safety must be capable of identifying the risks and projecting their potential consequences. Thus, it is possible to define operational safety objectives (in terms of reliability, maintainability, availability and/or safety) for our system. 6. Specification of system requirements Risk and Safety Integrity Level 41 The studies relating to operational safety follow the same phases as the lifecycle (specification, design, production and modification).
This lessens the quality of the software, leading to software packages whose reliability is poor. More specifically, in the context of SIL 0, 1 or 2 systems, the industrialists can use “Commercial Off-The-Shelf” (COTS) products. Quality assurance, which has a direct impact on the reliability and availability of COTS products, remains a current issue. 5. EN 50155 standard EN 50155 [AFN 07] is applicable for all electronic equipment7 fitted in railway vehicles. 3 therein gives an in-depth description of the rules applicable to software-related aspects.
One of the peculiar points of CENELEC 50128 lies in the need to deconstruct the implementation of the resources. For this reason, it is said to be a “resources standard”. CENELEC 50128 explicitly introduces the concept of evaluation. As we showed in [BOU 07a], for software applications, evaluation involves demonstrating that the software application achieves the safety objectives set for it. Evaluation of the SIL of a software application is based on: – the use of audits: is quality-assurance (QA) effectively employed on the project?