{"id":35486,"date":"2023-01-04T17:58:24","date_gmt":"2023-01-04T16:58:24","guid":{"rendered":"https:\/\/www.gt-engineering.it\/?post_type=normativa_tecnica&#038;p=35486"},"modified":"2023-07-10T10:45:37","modified_gmt":"2023-07-10T09:45:37","slug":"mode-de-fonctionnement-a-forte-et-faible-demande","status":"publish","type":"normativa_tecnica","link":"https:\/\/www.gt-engineering.it\/fr\/reglements-techniques\/normes-iec\/iec-61508-securite-fonctionnelle-des-e-e-pe\/mode-de-fonctionnement-a-forte-et-faible-demande\/","title":{"rendered":"Mode de fonctionnement \u00e0 forte et faible demande"},"content":{"rendered":"\n\n    \n        <section\n            data-name=\"Contenuto testuale con immagine\"\n            class=\"bow-gte-testo-media u-spacer-base\"\n            id=\"\"\n        >\n            \n<div class=\"o-text-media px-side-spacer sm:px-side-spacer-sm lg:px-side-spacer-tablet 2xl:px-side-spacer-desktop flex flex-wrap items-start md:block\">\n\n    \n        \n                    <div\n                class=\"h-auto mb-6 md:mb-4 lg:mb-8 xl:mb-9 float-left mr-6 md:mr-4 lg:mr-8 xl:mr-9  overflow-hidden shadow-content-image w-full md:w-1\/3\"\n            >\n                \r\n\r\n    \r\n        \r\n            \r\n                \r\n                    <picture\r\n                        class=\"\"\r\n                                            >\r\n                                                                                                        <source\r\n                                media=\"(max-width: 150px)\"\r\n                                width=\"150\"\r\n                                height=\"150\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/5-high-and-low-150x150.jpg\"\r\n                                type=\"image\/jpeg\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 300px)\"\r\n                                width=\"300\"\r\n                                height=\"232\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/5-high-and-low-300x232.jpg\"\r\n                                type=\"image\/jpeg\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 768px)\"\r\n                                width=\"768\"\r\n                                height=\"595\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/5-high-and-low-768x595.jpg\"\r\n                                type=\"image\/jpeg\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 1024px)\"\r\n                                width=\"1024\"\r\n                                height=\"793\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/5-high-and-low-1024x793.jpg\"\r\n                                type=\"image\/jpeg\"\r\n                            \/>\r\n                                                                            <img\r\n                            class=\"a-image transparent border-image h-auto  w-full\"\r\n                                                        srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/5-high-and-low-scaled.jpg\"\r\n                                                        title=\"5 high and low\"\r\n                                                        type=\"image\/jpeg\"\r\n                        \/>\r\n                    <\/picture>\r\n\r\n                \r\n\r\n                    \r\n    \r\n            <\/div>\n        \n                    <div class=\"relative w-full\">\n                \n<div class=\"a-text font-text text-base normal mt-8 first:mt-0 space-y-4\">\n    <p>La norme IEC 61508-1 pr\u00e9cise quelle mesure de d\u00e9faillance cible, ou fonction de non-fiabilit\u00e9 F(t), <strong>doit \u00eatre utilis\u00e9e en fonction du mode de fonctionnement :<\/strong><\/p>\n<ul>\n<li><strong>PFDavg<\/strong> doit \u00eatre utilis\u00e9 pour les syst\u00e8mes de s\u00e9curit\u00e9 en mode faible demande.<\/li>\n<li><strong>PFHD<\/strong> doit \u00eatre utilis\u00e9 pour les syst\u00e8mes de s\u00e9curit\u00e9 \u00e0 forte demande ou en mode continu.<\/li>\n<\/ul>\n<blockquote><p><em><strong>[IEC 61508-1] 7.6 Attribution des exigences g\u00e9n\u00e9rales de s\u00e9curit\u00e9<\/strong><\/em><\/p>\n<p><em>[7.6.2.9 Lorsque l&rsquo;attribution a suffisamment progress\u00e9, les exigences d&rsquo;int\u00e9grit\u00e9 de la s\u00e9curit\u00e9, pour chaque fonction de s\u00e9curit\u00e9 attribu\u00e9e au(x) syst\u00e8me(s) li\u00e9(s) \u00e0 la s\u00e9curit\u00e9 de l&rsquo;E\/E\/PE, doivent \u00eatre sp\u00e9cifi\u00e9es en termes de niveau d&rsquo;int\u00e9grit\u00e9 de la s\u00e9curit\u00e9 conform\u00e9ment au tableau 2 ou au tableau 3 et doivent indiquer si la mesure de la d\u00e9faillance cible est, soit<\/em><\/p><\/blockquote>\n<ul>\n<li>\n<blockquote><p><em>La probabilit\u00e9 moyenne de d\u00e9faillance dangereuse \u00e0 la demande de la fonction de s\u00e9curit\u00e9 (PFDavg), pour un mode de fonctionnement \u00e0 faible demande (tableau 2), ou<\/em><\/p><\/blockquote>\n<\/li>\n<li>\n<blockquote><p><em>La fr\u00e9quence moyenne d&rsquo;une d\u00e9faillance dangereuse de la fonction de s\u00e9curit\u00e9 [h-1], (PFH), pour un mode de fonctionnement \u00e0 forte demande (tableau 3), ou<\/em><\/p><\/blockquote>\n<\/li>\n<li>\n<blockquote><p><em>La fr\u00e9quence moyenne d&rsquo;une d\u00e9faillance dangereuse de la fonction de s\u00e9curit\u00e9 [h-1], (PFH), pour un mode de fonctionnement continu (tableau 3).<\/em><\/p><\/blockquote>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<\/div>            <\/div>\n        \n        \n                <div class=\"clear-both\"><\/div>\n        \n\n    <\/div>\n        <\/section>\n\n    \n","protected":false},"excerpt":{"rendered":"<p>La norme IEC 61508-1 pr\u00e9cise quelle mesure de d\u00e9faillance cible, ou fonction de non-fiabilit\u00e9 F(t), doit \u00eatre utilis\u00e9e en fonction du mode de fonctionnement :<\/p>\n","protected":false},"author":182,"featured_media":36220,"parent":35393,"menu_order":3,"template":"","meta":{"_acf_changed":false,"footnotes":""},"normative-tecniche":[165],"class_list":["post-35486","normativa_tecnica","type-normativa_tecnica","status-publish","has-post-thumbnail","hentry","tipologia_normativa-normes-iec"],"acf":{"sottotitolo":"","allegati":null},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Mode de 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