By Jean-Louis Boulanger
CENELEC EN 50128 and IEC 62279 criteria are appropriate to the functionality of software program within the railway region. The 2011 model of the 50128 general companies up the strategies and techniques to be carried out. it is a consultant to its implementation, so as to comprehend the principles of the traditional and the way it affects at the actions to be undertaken, aiding in the direction of higher a education for the self sufficient review section, that is mandatory.
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Extra info for CENELEC 50128 and IEC 62279 Standards
Sample text
The hazard will be continually experienced. Will occur several times. The hazard can be expected to occur often. Likely to occur several times. The hazard can be expected to occur several times. Likely to occur sometime in the system lifecycle. The hazard can reasonably be expected to occur. Unlikely to occur but possible. It can be assumed that the hazard may exceptionally occur. Extremely unlikely to occur. It can be assumed that the hazard may not occur. 2. 2, the term “often” indicates that the hazardous situation has occurred in the past and will likely occur again.
These requirements are more demanding for higher SILs, with a view to ensuring a lesser probability of a dangerous fault. Using the SIL scale, it is possible to set out prescribed practices relating to the integrity of the safety functions being entrusted to the E/E/PE systems. 3. History between CENELEC and the IEC Electric/electronics systems have been in use for many years, performing safety-related functions (the term safety is used in this context in most industrial sectors). IEC 61508 presents a generic approach to all activities pertaining to the safety lifecycle of the E/E/PE systems used to perform safety-related functions.
2. Choice of SSIL The SSIL is set on the basis of safety analyses as an objective to be attained in the creation of the software. Thus, CENELEC 50128 introduces 28 CENELEC 50128 and IEC 62279 Standards the concept of independent evaluation to confirm that this objective has been achieved. The SSIL is a safety integrity objective which must be met. This objective cannot be quantified, which is why CENELEC 50128 includes the idea of evaluation. An outsider, independent of the software development team, evaluates whether or not the objective has been achieved.