IEC 61508-3 PDF

Additional requirements for management of safety-related software The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and nongovernmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization ISO in accordance with conditions determined by agreement between the two organizations.

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Additional requirements for management of safety-related software The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields.

Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and nongovernmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization ISO in accordance with conditions determined by agreement between the two organizations.

While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.

Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. Use of the referenced publications is indispensable for the correct application of this publication. IEC shall not be held responsible for identifying any or all such patent rights.

This second edition cancels and replaces the first edition published in This edition constitutes a technical revision. This edition has been subject to a thorough review and incorporates many comments received at the various revision stages. It has the status of a basic safety publication according to IEC Guide 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.

Instead it provides a risk-based conceptual framework and example techniques. NOTE 4 It may be possible to achieve designs of safety-related systems with lower values for the target safety integrity for non-complex systems, but these limits are considered to represent what can be achieved for relatively complex systems for example programmable electronic safety-related systems at the present time.

NOTE 2 Specifying the software safety functions and software systematic capability is an iterative procedure; see Figures 3 and 6. The documentation structure may take account of company procedures, and of the working practices of specific application sectors. Does not apply for medical equipment in compliance with the IEC series. In this context, the requirements, test methods or test conditions of this basic safety publication will not apply unless specifically referred to or included in the publications prepared by those technical committees.

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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.

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