{"id":38658,"date":"2023-05-08T11:13:36","date_gmt":"2023-05-08T10:13:36","guid":{"rendered":"https:\/\/www.gt-engineering.it\/?post_type=normativa_tecnica&#038;p=38658"},"modified":"2023-07-12T10:50:13","modified_gmt":"2023-07-12T09:50:13","slug":"categorie-4","status":"publish","type":"normativa_tecnica","link":"https:\/\/www.gt-engineering.it\/fr\/reglements-techniques\/normes-en-iso\/en-iso-13849-1-securite-fonctionnelle-des-machines\/categorie-4\/","title":{"rendered":"Cat\u00e9gorie 4"},"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 flex-col\">\n\n    \n\n                    <div \n                class=\"order-2 relative w-full\"\n            >\n                <div\n                    class=\"pt-6 space-y-6 w-full md:pt-0 md:space-y-4 lg:space-y-8 xl:space-y-9\"\n                >\n                    \n<div class=\"a-text font-text text-base normal mt-8 first:mt-0 space-y-4\">\n    <p>Dans la cat\u00e9gorie 4, les principes de s\u00e9curit\u00e9 de base et les principes de s\u00e9curit\u00e9 \u00e9prouv\u00e9s doivent \u00eatre utilis\u00e9s. Chaque sous-syst\u00e8me de la cat\u00e9gorie 4 doit \u00eatre con\u00e7u de mani\u00e8re \u00e0 ce qu&rsquo;une seule d\u00e9faillance n&rsquo;entra\u00eene pas la perte de la fonction de s\u00e9curit\u00e9.<br \/>\nEn outre, la d\u00e9faillance unique doit \u00eatre d\u00e9tect\u00e9e au moment o\u00f9 la fonction de s\u00e9curit\u00e9 est sollicit\u00e9e ou avant qu&rsquo;elle ne le soit. Lorsque cette d\u00e9tection n&rsquo;est pas possible, une accumulation de fautes non d\u00e9tect\u00e9es ne <strong>doit pas entra\u00eener la perte de la fonction de s\u00e9curit\u00e9<\/strong>. Le RBD est illustr\u00e9 \u00e0 la figure 6.28.<\/p>\n<\/div>                <\/div>\n            <\/div>\n        \n                    <div\n                class=\"h-auto order-2   mt-6 md:mt-4 lg:mt-8 xl:mt-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\/07\/categoria-4.png-150x150.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 300px)\"\r\n                                width=\"300\"\r\n                                height=\"155\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/07\/categoria-4.png-300x155.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 768px)\"\r\n                                width=\"768\"\r\n                                height=\"397\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/07\/categoria-4.png-768x397.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 1024px)\"\r\n                                width=\"1024\"\r\n                                height=\"529\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/07\/categoria-4.png-1024x529.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                            <img\r\n                            class=\"a-image transparent border-image h-auto  w-full mx-auto\"\r\n                                                        srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/07\/categoria-4.png.webp\"\r\n                                                        title=\"categoria-4.png\"\r\n                                                        type=\"image\/webp\"\r\n                        \/>\r\n                    <\/picture>\r\n\r\n                \r\n\r\n                    \r\n    \r\n            <\/div>\n        \n    <\/div>\n        <\/section>\n\n    \n\n\n\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        \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 <strong>couverture de diagnostic<\/strong> (DCavg) de chaque sous-syst\u00e8me doit \u00eatre \u00e9lev\u00e9e. La MTTFD de chaque canal redondant doit \u00eatre \u00e9lev\u00e9e et des mesures contre la<strong> CCF<\/strong> doivent \u00eatre appliqu\u00e9es.<br \/>\nLe comportement du sous-syst\u00e8me de cette cat\u00e9gorie est donc caract\u00e9ris\u00e9 par :<br \/>\n&#8211; Le maintien de la fonction de s\u00e9curit\u00e9 en pr\u00e9sence d&rsquo;une seule d\u00e9faillance.<br \/>\n&#8211; La d\u00e9tection des d\u00e9fauts \u00e0 temps pour \u00e9viter la perte de la fonction de s\u00e9curit\u00e9.<br \/>\n&#8211; L&rsquo;accumulation de d\u00e9fauts non d\u00e9tect\u00e9s est prise en compte.<\/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>Dans la cat\u00e9gorie 4, les principes de s\u00e9curit\u00e9 de base et les principes de s\u00e9curit\u00e9 \u00e9prouv\u00e9s doivent \u00eatre utilis\u00e9s. Chaque sous-syst\u00e8me de la cat\u00e9gorie 4 doit \u00eatre con\u00e7u de mani\u00e8re \u00e0 ce qu&rsquo;une seule d\u00e9faillance n&rsquo;entra\u00eene pas la perte de la fonction de s\u00e9curit\u00e9.<\/p>\n","protected":false},"author":182,"featured_media":38659,"parent":38606,"menu_order":6,"template":"","meta":{"_acf_changed":false,"footnotes":""},"normative-tecniche":[164],"class_list":["post-38658","normativa_tecnica","type-normativa_tecnica","status-publish","has-post-thumbnail","hentry","tipologia_normativa-normes-en-iso"],"acf":{"sottotitolo":"Mean Time To Failure (MTTF)","allegati":null},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Cat\u00e9gorie 4 - Gt-Engineering<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.gt-engineering.it\/fr\/reglements-techniques\/normes-en-iso\/en-iso-13849-1-securite-fonctionnelle-des-machines\/categorie-4\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cat\u00e9gorie 4 - Gt-Engineering\" \/>\n<meta property=\"og:description\" content=\"Dans la cat\u00e9gorie 4, les principes de s\u00e9curit\u00e9 de base et les principes de s\u00e9curit\u00e9 \u00e9prouv\u00e9s doivent \u00eatre utilis\u00e9s. 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