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EN 50129 Safety Case

The EN 50129 safety case is the structured and documented safety statement that the conditions for safety acceptance have been fulfilled. The safety case includes all safety-relevant aspects of the product life cycle. When creating the document, the challenge is therefore to present a wide range of information in a clear and comprehensible manner. EN 50129 supports you in this by providing a relatively detailed structure for the documentation.

In the following article, I will deal with the key factors relevant to practice for an EN 50129 compliant safety case. Read more

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Requirement completeness using data- and control flow analysis

Carrying out a data- and control flow analysis is required in almost all functional safety standards (ISO 26262-6 Table 7 Measures 1f/g, DO 178C Table A-7 Measure 8 and EN 50128, EN 50657Table A19 Measures3/4). In comparison to other measures, the data and control flow analysis causes a lot of questions, when it comes to the real execution. This is mainly since the technological capabilities have so far been lacking to carry out such an analysis.

The new non-intrusive system observation technology (www.accemic.de) offers the possibility to prove data- and control flows by tests. Therefore, a systematic check can be performed in future to prove the functional completeness of the requirements. Read more

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Challenges when determining the structural source code coverage on the target!

Structural Coverage Target: The proof of a 100% structural source code coverage is required by almost all functional safety standards (IEC61508, ISO26262, DO 178C, etc.). In the individual SIL / ASIL levels, only the type of source code coverage is differentiated. Essentially, the Statement Coverage (low SIL / ASIL Level), the Branch Coverage and the MC / DC Coverage (high SIL / ASIL Level) are required. For good reasons, however, e.g. no path coverage required. These would mean that you would check all the combinations of paths that are possible in a software. This would be an extremely high multiple of test cases compared to MC / DC coverage. Read more

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Importance of Tool Qualification in the FuSa (part 1)!

Importance of Tool Qualification : Many companies and project teams that carry out projects for the first time in the field of functional safety have the impression that the tool qualification is critical to success and involves a great deal of effort. Although the Importance of Tool Qualification is justified, the subject is interestingly often given an not adequate attention.
This effect is very similar in several, very different industries such as aerospace, automotive or industrial automation.
The following article (part 1) therefore deals with this topic. Part 2 can be found here: Tool qualification – The phantom pain of functional safety (part 2)! Read more

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EN 50128 configurable Systems – The solution?

EN 50128 configurable Systems: Chapter 8 of EN 50128 specifies the requirements for systems that are configured by application data or application algorithms (EN 50128 configurable Systems). This blog summarizes the essential requirements of the standard and the practice-oriented challenges of software-configurable embedded systems.
At the first glance the configurability offers only advantages. The functional behavior of the entire system can be adjusted by simple and rapid changes in the application data to the desired behavior. The source code of the generic software is not to changed. A multiple reuse is possible thereby. If it is well done, even the unit tests should be reuseable, without any change. The EN 50128 also states that proven, generic software can be reused repeatedly in this way. These are important advantages. Read more

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EN 50128 Functional Safety in the railway industry

The EN 50128 Functional Safety standard describes together with the EN 50126 and EN 50129 the functional safety in the railway industry. These standards implement the IEC61508 for this industry.
The peculiarity of the rail industry with regard to functional safety is that the systems are to be certified by an governmental authority (in Germany the federal railway authority), before they are allowed to be placed into a railway system. So, the manufacturer must provide proof of compliance with the functional safety standards already during the development of the product. In this point the aviation and rail industry are very similar.

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