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DS/EN ISO 13849-1:2015

Safety of machinery - Safety-related parts of control systems - Part 1: General principles for design

This part of ISO 13849 provides safety requirements and guidance on the principles for the design and integration of safety-related parts of control systems (SRP/CS), including the design of software. For these parts of SRP/CS, it specifies characteristics that include the performance level required for carrying out safety functions. It applies to SRP/CS, regardless of the type of technology and energy used (electrical, hydraulic, pneumatic, mechanical, etc.), for all kinds of machinery.*It does not specify the safety functions or performance levels that are to be used in a particular case.*This part of ISO 13849 provides specific requirements for SRP/CS using programmable electronic system(s).*It does not give specific requirements for the design of products which are parts of SRP/CS. Nevertheless, the principles given, such as categories or performance levels, can be used.*NOTE 1 Examples of products which are parts of SRP/CS: relays, solenoid valves, position switches, PLCs, motor control units, two-hand control devices, pressure sensitive equipment. For the design of such products, it is important to refer to the specifically applicable International Standards, e.g. ISO 13851, ISO 13856-1 and ISO 13856-2.*NOTE 2 For the definition of required performance level, see 3.1.24.*NOTE 3 The requirements provided in this part of ISO 13849 for programmable electronic systems are compatible with the methodology for the design and development of safety-related electrical, electronic and programmable electronic control systems for machinery given in IEC 62061.*NOTE 4 For safety-related embedded software for components with PLr = e see IEC 61508-3:1998, Clause 7.*NOTE 5 See also Table 1.

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