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.
BS EN ISO 13849-1:2008 Referenced Document
IEC 60050-191:1990 International electrotechnical vocabulary; chapter 191: dependability and quality of service
IEC 61508-3:1998 Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 3: Software requirements
IEC 61508-4:1998 Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 4: Definitions and abbreviations
ISO 12100-1:2003 Safety of machinery - Basic concepts, general principles for design - Part 1: Basic terminology, methodology
ISO 12100-2:2003 Safety of machinery - Basic concepts, general principles for design - Part 2: Technical principles
ISO 13849-2:2003 Safety of machinery - Safety-related parts of control systems - Part 2: Validation
ISO 14121 Safety of machinery - Principles of risk assessment
BS EN ISO 13849-1:2008 history
2023BS EN ISO 13849-1:2023 Safety of machinery. Safety-related parts of control systems - General principles for design
2016BS EN ISO 13849-1:2015 Safety of machinery. Safety-related parts of control systems. General principles for design
2009BS EN ISO 13849-1:2008 Safety of machinery. Safety-related parts of control systems. Part 1: General principles for design
2007BS EN ISO 13849-1:2006 Safety of machinery - Safety-related parts of control systems - General principles for design
1997BS EN 954-1:1997 Safety of machinery - Safety related parts of control systems - General principles for design