IEC 61508-4 PDF

Those requirements are listed in a document called the certification scheme. IEC certification programs are operated by impartial third party organizations called certification bodies CB. Certification bodies are accredited to perform the auditing, assessment, and testing work by an accreditation body AB. There is often one national AB in each country. IEC certification programs have been established by several global Certification Bodies. Each has defined their own scheme based upon IEC and other functional safety standards.

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Table 1 — Abbreviations used in this standard 9 This is a free 9 page sample. Computer-based systems generically referred to as programmable electronic systems are being used in all application sectors to perform non-safety functions and, increasingly, to perform safety functions.

If computer system technology is to be effectively and safely exploited, it is essential that those responsible for making decisions have sufficient guidance on the safety aspects on which to make these decisions. This unified approach has been adopted in order that a rational and consistent technical policy be developed for all electrically-based safety-related systems. A major objective is to facilitate the development of product and application sector international standards based on the IEC series.

NOTE 1 Examples of product and application sector international standards based on the IEC series are given in the Bibliography see references [1], [2] and [3]. In most situations, safety is achieved by a number of systems which rely on many technologies for example mechanical, hydraulic, pneumatic, electrical, electronic, programmable electronic. Any safety strategy must therefore consider not only all the elements within an individual system for example sensors, controlling devices and actuators but also all the safety-related systems making up the total combination of safety-related systems.

In any particular application, the required safety measures will be dependent on many factors specific to the application. This International Standard, by being generic, will enable such measures to be formulated in future product and application sector international standards and in revisions of those that already exist.

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