{"id":4262,"date":"2023-03-24T08:31:02","date_gmt":"2023-03-24T00:31:02","guid":{"rendered":"http:\/\/gcanbus.com\/?p=4262"},"modified":"2023-03-24T08:31:02","modified_gmt":"2023-03-24T00:31:02","slug":"what-is-modbus-protocol","status":"publish","type":"post","link":"https:\/\/gcanbus.com\/fr\/what-is-modbus-protocol\/","title":{"rendered":"Qu'est-ce que le protocole Modbus ?"},"content":{"rendered":"<div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-1 fusion-flex-container has-pattern-background has-mask-background hundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-stretch fusion-flex-justify-content-space-evenly fusion-flex-content-wrap\" style=\"width:104% !important;max-width:104% !important;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-0 fusion_builder_column_2_3 2_3 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:66.666666666667%;--awb-margin-top-large:0px;--awb-spacing-right-large:3.84%;--awb-margin-bottom-large:0px;--awb-spacing-left-large:2.88%;--awb-width-medium:66.666666666667%;--awb-order-medium:0;--awb-spacing-right-medium:3.84%;--awb-spacing-left-medium:2.88%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-block\"><div class=\"fusion-text fusion-text-1\" style=\"--awb-margin-left:5%;\"><p>Le protocole Modbus est une structure de messagerie d\u00e9velopp\u00e9e par Modicon en 1979. Il est utilis\u00e9 pour \u00e9tablir une communication client-serveur entre des dispositifs intelligents.<\/p>\n<p>Modbus est devenu un protocole de communication standard et constitue d\u00e9sormais un moyen couramment utilis\u00e9 pour connecter les appareils \u00e9lectroniques industriels. Il est populaire dans les environnements industriels parce qu'il est publi\u00e9 ouvertement et libre de droits.<\/p>\n<p><strong>Il existe principalement trois variantes de protocoles Modbus :<\/strong><\/p>\n<ul>\n<li>Modbus RTU (Remote Terminal Unit) - utilis\u00e9 pour la communication en s\u00e9rie, c'est l'impl\u00e9mentation la plus courante disponible pour Modbus.<\/li>\n<li>Modbus ASCII - utilis\u00e9 dans les communications en s\u00e9rie et utilisant les caract\u00e8res ASCII pour la communication du protocole.<\/li>\n<li>Modbus TCP\/IP ou Modbus TCP - une variante de Modbus utilis\u00e9e pour les communications sur les r\u00e9seaux TCP\/IP, se connectant sur le port 502.<\/li>\n<\/ul>\n<p><strong>Les avantages de l'utilisation du protocole Modbus sont les suivants<\/strong><br \/>\n- Il s'agit d'un protocole \u00e0 source ouverte.<br \/>\n- Les messages Modbus sont des structures de messagerie simples, ce qui les rend moins difficiles \u00e0 d\u00e9ployer.<br \/>\n- Modbus d\u00e9place des mots et des bits bruts et a tr\u00e8s peu de restrictions.<br \/>\n- Le pilote peut fonctionner et \u00e9changer des donn\u00e9es avec le PC en quelques heures si le pilote est d\u00e9j\u00e0 install\u00e9 et si vous \u00eates familiaris\u00e9 avec les prises Ethernet et TCP\/IP.<br \/>\n<strong>Les inconv\u00e9nients de l'utilisation du protocole Modbus sont les suivants :<\/strong><br \/>\n- Modbus est limit\u00e9 \u00e0 l'adressage de 247 appareils sur une liaison de donn\u00e9es, ce qui limite le nombre d'appareils de terrain connect\u00e9s \u00e0 une station ma\u00eetre (Ethernet TCP\/IP constituant l'exception).<br \/>\n- Modbus a \u00e9t\u00e9 con\u00e7u \u00e0 la fin des ann\u00e9es 1970 pour communiquer avec les automates programmables, le nombre de types de donn\u00e9es \u00e9tant limit\u00e9.<br \/>\n- Modbus\/TCP n'est pas un protocole de communication s\u00e9curis\u00e9. Modbus\/TCP n'offre pas la possibilit\u00e9 d'utiliser la s\u00e9curit\u00e9 ou le cryptage lors de la communication entre les appareils. Cela cr\u00e9e une vuln\u00e9rabilit\u00e9 potentielle en mati\u00e8re de s\u00e9curit\u00e9 dans un syst\u00e8me d'automatisation.<\/p>\n<\/div><\/div><\/div><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-1 fusion_builder_column_1_4 1_4 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:25%;--awb-margin-top-large:0px;--awb-spacing-right-large:7.68%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:7.68%;--awb-width-medium:25%;--awb-order-medium:0;--awb-spacing-right-medium:7.68%;--awb-spacing-left-medium:7.68%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-block\"><div class=\"fusion-image-element in-legacy-container\" style=\"--awb-caption-title-font-family:var(--h2_typography-font-family);--awb-caption-title-font-weight:var(--h2_typography-font-weight);--awb-caption-title-font-style:var(--h2_typography-font-style);--awb-caption-title-size:var(--h2_typography-font-size);--awb-caption-title-transform:var(--h2_typography-text-transform);--awb-caption-title-line-height:var(--h2_typography-line-height);--awb-caption-title-letter-spacing:var(--h2_typography-letter-spacing);\"><span class=\"fusion-imageframe imageframe-none imageframe-1 hover-type-none\"><img decoding=\"async\" width=\"500\" height=\"353\" title=\"1245\" src=\"https:\/\/gcanbus.com\/wp-content\/uploads\/2023\/03\/1245.webp\" data-orig-src=\"http:\/\/gcanbus.com\/wp-content\/uploads\/2023\/03\/1245.webp\" alt class=\"lazyload img-responsive wp-image-4263\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20width%3D%27500%27%20height%3D%27353%27%20viewBox%3D%270%200%20500%20353%27%3E%3Crect%20width%3D%27500%27%20height%3D%27353%27%20fill-opacity%3D%220%22%2F%3E%3C%2Fsvg%3E\" data-srcset=\"https:\/\/gcanbus.com\/wp-content\/uploads\/2023\/03\/1245-200x141.webp 200w, https:\/\/gcanbus.com\/wp-content\/uploads\/2023\/03\/1245-300x212.webp 300w, https:\/\/gcanbus.com\/wp-content\/uploads\/2023\/03\/1245-400x282.webp 400w, https:\/\/gcanbus.com\/wp-content\/uploads\/2023\/03\/1245.webp 500w\" data-sizes=\"auto\" data-orig-sizes=\"(max-width: 640px) 100vw, 400px\" \/><\/span><\/div><\/div><\/div><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-2 fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:1.92%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:1.92%;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-text fusion-text-2\"><p style=\"text-align: right;\"><span style=\"font-size: 14pt; color: #333333;\"><strong><span style=\"font-family: arial, helvetica, sans-serif;\">\u00c0 la recherche d'un <span style=\"color: #ff6600;\"><a style=\"color: #ff6600;\" href=\"http:\/\/gcanbus.com\/fr\/plc-io-coupler\/\">Coupleur PLC E\/S<\/a><\/span>? <\/span><\/strong><strong><span style=\"font-family: arial, helvetica, sans-serif;\">Cliquez pour en savoir plus !<\/span><\/strong><\/span><\/p>\n<\/div><\/div><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":4263,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_joinchat":[],"footnotes":""},"categories":[25],"tags":[63,64],"class_list":["post-4262","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-modbus","tag-protocol"],"_links":{"self":[{"href":"https:\/\/gcanbus.com\/fr\/wp-json\/wp\/v2\/posts\/4262","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gcanbus.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gcanbus.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gcanbus.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gcanbus.com\/fr\/wp-json\/wp\/v2\/comments?post=4262"}],"version-history":[{"count":0,"href":"https:\/\/gcanbus.com\/fr\/wp-json\/wp\/v2\/posts\/4262\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/gcanbus.com\/fr\/wp-json\/wp\/v2\/media\/4263"}],"wp:attachment":[{"href":"https:\/\/gcanbus.com\/fr\/wp-json\/wp\/v2\/media?parent=4262"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gcanbus.com\/fr\/wp-json\/wp\/v2\/categories?post=4262"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gcanbus.com\/fr\/wp-json\/wp\/v2\/tags?post=4262"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}