IEC TR 62061-1:2010 pdf free download

IEC TR 62061-1:2010 pdf free download Guidance on the application of ISO 13849-1 and IEC 62061 in the design of safety-related control systems for machinery
1 Scope
This Technical Report is intended to explain the application of lEC 62061 and ISO 13849-12)in the design of safety-related control systems for machinery.
2General
2.1 Both IEC 62061 and ISO 13849-1 specifyrequirements for the design andimplementation of safety-related control systems of machinery3).The methods developed inboth of these standards are different but,when correctly applied, can achieve a comparablelevel of risk reduction.
2.2 These standards classify safety-related control systems that implement safety functionsinto levels that are defined in terms of their probability of dangerous failure per hour.ISO 13849-1 has five Performance Levels (PLs), a, b, c, d and e, while lEC 62061 has threesafety integrity levels (sILs)，1,2 and 3.
2.3 Product standards (type-C) committees specify the safety requirements for safety-relatedcontrol systems and it is recommended that these committees classify the levels ofconfidence required for them in terms of PLs and SILs.
2.4 Machinery designers may choose to use either lEC 62061 or ISO 13849-1 depending onthe specific features of the application.
2.5 The selection and use of either standard is likely to be determined by, for example:
– previous knowledge and experience in the design of machinery safety-related control systems based upon the concept of categories described in lSO i3849-1:1999 can meanthat the use of lso 13849-1:2006 is more appropriate;
safety-related control systems based upon media other than electrical can mean that theuse of ISO 13849-1 is more appropriate;
customer requirements to demonstrate the safety integrity of a machine safety-relatedcontrol system in terms of a SIL can mean that the use of lEC 62061 is more appropriate;safety-related control systems of machinery used in, for example,the process industries,where other safety-related systems (such as safety instrumented systems in accordancewith IEC 61511) are characterized in terms of SILs, can mean that the use of lEC 62061 ismore appropriate.
3Comparison of standards
3.1 A comparison of the technical requirements in lSO 13849-1 and lEC 62061 has beencarried out in respect of the following aspects:
– terminology;
– risk estimation and performance allocation;
– safety requirements specification;
– systematic integrity requirements;
– diagnostic functions;
– software safety requirements.
3.2 Additionally, an evaluation of the use of the simplified mathematical formulae to determine the probability of dangerous failures (PFH D ) and MTTF d according to both standards has been carried out.
3.3 The conclusions from this work are the following.
– Safety-related control systems can be designed to achieve acceptable levels of functional safety using either of the two standards by integrating non-complex 4) SRECS (safety- related electrical control system) subsystems or SRP/CS (safety-related parts of a control system) designed in accordance with IEC 62061 and ISO 1 3849-1 , respectively.