3500/61-01-05ISO 13849-1 – Significant changes to 2023
In 2023, the International Organization for Standardization (ISO) published a new revision of the ISO 13849-1 standard. This update introduces new guidelines, particularly on how to determine performance levels (PL), designed to provide clearer support for implementing security measures. In addition, the new standard also emphasizes the importance of software in the security of control systems.
At present, it is uncertain when this newly revised ISO 13849-1 will be formally adopted as the EU standard EN ISO 13849-1. At the same time, it is also unknown whether there will be a transition period to allow the industry to gradually adapt to the new standards. The length of the transition period, if any, has not been announced.
Given these uncertainties, Piermagnetic’s standards experts recommend to designers and operators to start preparing for and adapting to the coming changes as early as possible, before the new standards take effect. This will help ensure that their products and systems meet the latest safety requirements when the new standards are implemented.
Significant changes have been made to ISO 13849 1:2233500/61-01-05 compared to the previous version, 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); C3500/61-01-05hange 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
As a safety automation supplier with many years of industry experience, we can provide users with safety consulting and services to adapt to the changes brought about by the new standards and ensure the safety of users’ employees and machinery.
