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. 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.

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Relevant means of implementing safety functions include electro-mechanical relays i. For safety functions to be effectively specified and implemented, it is essential to consider the system as a whole. This applicability is appropriate because many requirements, particularly in IEC , are not technology specific. Indeed, early development phases such as initial concept, overall scope definition, hazard and risk analysis and specifying the overall safety requirements may take place before the implementation technology has been decided.

A5 How does IEC apply to systems whose function is to avoid damage to the environment or severe financial loss? IEC is concerned with achieving functional safety , where safety is defined as freedom from unacceptable risk of physical injury or damage to the health of people, either directly or indirectly as a result of damage to property or to the environment see 3.

So damage to long term health, including damage to property or the environment that leads to damage to long term health, is explicitly within the scope of the standard and is encompassed by the term safety. The particular safety functions that are necessary, and the associated levels of performance required of them, are determined by hazard and risk analysis see for example IEC An equivalent analysis of risk in terms of environmental or financial hazards can be performed by replacing safety parameters with environmental or financial parameters.

Most of the subsequent requirements of the standard are as applicable for "environmental functions" or "financial functions" as they are for safety functions. A6 What does IEC consist of? The standard is published in parts as shown in the table below. Only parts 1 to 4 contain normative requirements.

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International

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. The scheme lists the referenced standards and specifies procedures which describes their test methods, surveillance audit policy, public documentation policies, and other specific aspects of their program.

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