Different requirements for machine controls
Again and again, simple frequency converters, standard PLC control, simple light barriers etc. are to be used in safety functions. If category 1 is intended for these safety functions, proven components must be used. For this purpose, EN 13849-2 contains a list of well-tried components for electrical systems in Appendix D. For components not listed there, it can be determined that they are proven for a specific application. Details are provided in section 6.2.4 of EN 13849-1, but this is excluded for "complex electronic components".
The DGUV Test (= testing and certification system of the German Social Accident Insurance) has stated its position on this subject in a statement: according to its assessment, the exclusion of complex electronic components can still be justified due to numerous sources of error and weak points. A detailed justification of this position is presented in the position paper.
Note: The international standard ISO 13849-1 is currently being revised. It remains to be seen to what extent this positioning will apply to the successor standard.
Posted on: 2022-09-14
Team leader CE consulting and technical expert CE marking and Safexpert. Previously, Safexpert administrator and CE coordinator in the field of mechanical engineering as well as collaboration in the ISO standards committee for woodworking machines (EN 19085).
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