Guidance on the application of ISO 13849-1 and IEC 62061 - CEI/TR 62061-1:2010

CEI/TR 62061-1:2010 

Guidance on the application of ISO 13849-1 and IEC 62061 in the design of safety-related control systems for machinery



1 Scope
2 General
3 Comparison of standards
4 Risk estimation and assignment of required performance
5 Safety requirements specification
6 Assignment of performance targets: PL versus SIL
7 System design
7.1 General requirements for system design using IEC 62061 and ISO 13849-1
7.2 Estimation of PFHD and MTTFd and the use of fault exclusions 
7.3 System design using subsystems or SRP/CS that conform to either IEC 62061 or ISO 13849-1
7.4 System design using subsystems or SRP/CS that have been designed using other IEC or ISO standards
8 Example 
8.1 General
8.2 Simplified example of the design and validation of a safety-related control system implementing a specified safety-related control function
8.3 Conclusion
Figure 1 – Example implementation of the safety function
Figure 2 – Safety-related block diagram
Figure 3 – Safety-related block diagram for calculation according to ISO 13849-1
Figure 4 – Logical representation of subsystem D
Table 1 – Relationship between PLs and SILs based on the average probability of dangerous failure per hour
Table 2 – Architectural constraints on subsystems' maximum SIL CL that can be claimed for an SRCF using this subsystem



This Technical Report has been prepared by experts from both IEC/TC 44/WG 7 and ISO/TC 199/WG 8 in response to requests from their Technical Committees to explain the relationship between IEC 62061 and ISO 13849-1. In particular, it is intended to assist users of these International Standards in terms of the interaction(s) that can exist between the
standards to ensure that confidence can be given to the design of safety-related systems made in accordance with either standard.

It is intended that this Technical Report be incorporated into both IEC 62061 and ISO 13849-1 by means of corrigenda that reference the published version of this document. These corrigenda will also remove the information given in Table 1, Recommended application of IEC 62061 and ISO 13849-1, provided in the common introduction to both standards, which is now recognized as being out of date. Subsequently, it is intended to merge ISO 13849-1 and IEC 62061 by means of a JWG of ISO/TC 199 and IEC/TC 44.