SR EN ISO 13849-1:2007

This standard provides safety requirements and guidance on the principles for the design of safety-related parts of control systems (SRP/CS). For these parts it specifies characteristics and categories required for carrying out related safety functions. It applies to SRP/CSs, regardless of the type of technology and energy used (e.g. electrical, hydraulic, pneumatic, mechanical) for all kinds of machinery. It does not specify which safety functions and which categories shall be used in a particular case. In the case of using electronic system(s), this standard is applicable if one or more of the following is satisfied: 1) the required performance level (PLr)is a or b, or 2) the safety function is carried out by hardware where the fault behaviour is clearly determined and assessable, or 3) the contribution of programmable electronic systems within the SRP/CS which carries out the safety function is low (e.g. for monitoring) and the (PLr)is from a to d, or 4) the safety function is carried out by diverse programmable electronic systems and the required performance level is fr