The EN ISO 13849-1 standard is the basis for assessing the safety of complex machine control systems. It is a basic functional safety standard that contains internationally harmonized requirements relating to the determination of the required level of performance and the determination of safety-related control components until the implementation of the safety function.

Important changes to ISO 13849-1 in 2023

In 2023, the International Organization for Standardization (ISO) published a new version of ISO 13849-1. The revision provides a set of guidelines, such as for determining performance levels, to better support implementation. It also takes into account the deeper meaning of software. It is not yet clear when it will be harmonized into the EU standard EN ISO 13849-1, whether there will be a transition period for publication of the standard in the official Journal, and if so, how long this might be. Piermagnetic’s standards experts advise designers and operators to consider upcoming changes at an early stage.

DS200DCFBG1BLC

DS200DCFBG1BLC

Compared to the previous version of ISO 13849 1:2015, there are important changes to ISO 13849 1:2015:

The overall structure is clearer, with a focus on implementing security functions as a combination of multiple subsystems
Use the word “subsystem” throughout the file (instead of SRP/CS)
Improving and extending safety function specifications (Article 5)
Improved guidelines and additional requirements related to SRS (Safety Requirements Specification) (Article 5)
A description of the design (article 6); Examples include optimized Class 2 definitions that determine the CCF for each subsystem as well as fault considerations, troubleshooting, and tried and tested components
Improvements and descriptions of the software (Article 7)
Verification (Article 10); The specification requirements of ISO 13849-2 have been revised and incorporated into Part 1
Determine the required performance level (Annex A); Change of parameter P
Clarification of Measures for Public Cause Failure (CCF)-(Appendix F)
Extended functional safety management guidelines (annex G.5)
Details on how to ensure that the EMC anti-noise capability is high enough (Appendix L)
Supplementary information to the Safety Requirements Specification (Appendix M)
Avoid system failure through software design (Appendix N); Contains a simple software validation example
Additional information on component safety-relevant values (Appendix O), adapted to the methods in VDMA standard Table 66413
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