ISO 13849-2 specifies the validation process for the safety functions, categories and performance levels for the safety-related parts of control systems. It recognizes that the validation of safety-related parts of control systems can be achieved by a combination of analysis and testing and specifies the particular circumstances in which testing ought to be carried out.
Most of the procedures and conditions in ISO 13849-2 assume that the simplified procedure for estimating the performance level is used. ISO 13849-2 does not provide guidance for situations when other procedures are used to estimate performance levels.
Guidance on the general principles for the design of safety-related parts of control systems, regardless of the type of technology used (electrical, hydraulic, pneumatic, mechanical, etc.), is provided in ISO 13849-1. This includes descriptions of some typical safety functions, determination of their required performance levels, and general requirements of categories and performance levels.
Within ISO 13849-2, some of the validation requirements are general, whereas others are specific to the type of technology used. The text of ISO 13849-2:2012 has been approved in Europe as EN ISO 13849-2:2012 without any modification and it supersedes EN ISO 13849-2:2008.
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