{"id":82,"date":"2024-08-30T15:18:04","date_gmt":"2024-08-30T07:18:04","guid":{"rendered":"https:\/\/www.rwr.ink\/?p=82"},"modified":"2024-08-30T15:18:04","modified_gmt":"2024-08-30T07:18:04","slug":"modbus-tcp%e5%b8%a7%e7%bb%93%e6%9e%84%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.rwr.ink\/index.php\/2024\/08\/30\/modbus-tcp%e5%b8%a7%e7%bb%93%e6%9e%84%e8%af%a6%e8%a7%a3\/","title":{"rendered":"Modbus TCP\u5e27\u7ed3\u6784\u8be6\u89e3"},"content":{"rendered":"<p>Modbus TCP\u662f\u57fa\u4e8eTCP\/IP\u534f\u8bae\u7684Modbus\u53d8\u4f53\uff0c\u5e38\u7528\u4e8e\u4ee5\u592a\u7f51\u7f51\u7edc\u4e2d\u3002\u4e0eModbus RTU\u548cModbus ASCII\u4e0d\u540c\uff0cModbus TCP\u6ca1\u6709\u8d77\u59cb\u548c\u7ed3\u675f\u9759\u9ed8\u65f6\u95f4\uff0c\u800c\u662f\u4f7f\u7528TCP\/IP\u534f\u8bae\u8fdb\u884c\u6570\u636e\u4f20\u8f93\u3002\u4ee5\u4e0b\u662fModbus TCP\u5e27\u7ed3\u6784\u7684\u8be6\u7ec6\u89e3\u91ca\uff1a<\/p>\n<h3>Modbus TCP\u5e27\u7ed3\u6784<\/h3>\n<p>Modbus TCP\u5e27\u7531\u4ee5\u4e0b\u51e0\u4e2a\u90e8\u5206\u7ec4\u6210\uff1a<\/p>\n<ol>\n<li><strong>MBAP\u5934\uff08Modbus Application Protocol Header\uff09<\/strong><\/li>\n<li><strong>PDU\uff08Protocol Data Unit\uff09<\/strong><\/li>\n<\/ol>\n<h4>1. MBAP\u5934<\/h4>\n<p>MBAP\u5934\u5305\u542b7\u4e2a\u5b57\u8282\uff0c\u5177\u4f53\u7ed3\u6784\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li><strong>\u4e8b\u52a1\u6807\u8bc6\u7b26\uff08Transaction Identifier\uff09<\/strong>: 2\u5b57\u8282\n<ul>\n<li>\u7528\u4e8e\u5339\u914d\u8bf7\u6c42\u548c\u54cd\u5e94\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u534f\u8bae\u6807\u8bc6\u7b26\uff08Protocol Identifier\uff09<\/strong>: 2\u5b57\u8282\n<ul>\n<li>\u56fa\u5b9a\u4e3a0\uff0c\u8868\u793aModbus\u534f\u8bae\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u957f\u5ea6\uff08Length\uff09<\/strong>: 2\u5b57\u8282\n<ul>\n<li>\u8868\u793a\u540e\u7eed\u6570\u636e\u7684\u957f\u5ea6\uff0c\u5305\u62ec\u5355\u5143\u6807\u8bc6\u7b26\u548cPDU\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u5355\u5143\u6807\u8bc6\u7b26\uff08Unit Identifier\uff09<\/strong>: 1\u5b57\u8282\n<ul>\n<li>\u7528\u4e8e\u6807\u8bc6\u4ece\u8bbe\u5907\uff0c\u5728Modbus TCP\u4e2d\u901a\u5e38\u7528\u4e8e\u7f51\u5173\u573a\u666f\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4>2. PDU\uff08Protocol Data Unit\uff09<\/h4>\n<p>PDU\u5305\u542b\u4ee5\u4e0b\u90e8\u5206\uff1a<\/p>\n<ul>\n<li><strong>\u529f\u80fd\u7801\uff08Function Code\uff09<\/strong>: 1\u5b57\u8282\n<ul>\n<li>\u6307\u5b9a\u8bf7\u6c42\u7684\u64cd\u4f5c\u7c7b\u578b\uff08\u5982\u8bfb\u5199\u5bc4\u5b58\u5668\uff09\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u6570\u636e\u57df\uff08Data\uff09<\/strong>: \u53ef\u53d8\u957f\u5ea6\n<ul>\n<li>\u5305\u542b\u4e0e\u529f\u80fd\u7801\u76f8\u5173\u7684\u6570\u636e\uff08\u5982\u5bc4\u5b58\u5668\u5730\u5740\u548c\u6570\u91cf\uff09\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>\u5b8c\u6574\u7684Modbus TCP\u5e27\u7ed3\u6784<\/h3>\n<pre><code>+------------------+------------------+------------------+------------------+------------------+------------------+------------------+\n| Transaction ID   | Protocol ID      | Length           | Unit ID          | Function Code    | Data             |\n| (2 bytes)        | (2 bytes)        | (2 bytes)        | (1 byte)         | (1 byte)         | (N bytes)        |\n+------------------+------------------+------------------+------------------+------------------+------------------+------------------+<\/code><\/pre>\n<h3>\u793a\u4f8b<\/h3>\n<p>\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u8bfb\u53d6\u4fdd\u6301\u5bc4\u5b58\u5668\uff08\u529f\u80fd\u78010x03\uff09\u7684\u8bf7\u6c42\uff0c\u5176\u4e8b\u52a1\u6807\u8bc6\u7b26\u4e3a0x0001\uff0c\u534f\u8bae\u6807\u8bc6\u7b26\u4e3a0x0000\uff0c\u5355\u5143\u6807\u8bc6\u7b26\u4e3a0x01\uff0c\u8bfb\u53d6\u7684\u5bc4\u5b58\u5668\u5730\u5740\u4e3a0x0010\uff0c\u6570\u91cf\u4e3a2\u3002\u5e27\u7ed3\u6784\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li><strong>\u4e8b\u52a1\u6807\u8bc6\u7b26<\/strong>: 0x0001<\/li>\n<li><strong>\u534f\u8bae\u6807\u8bc6\u7b26<\/strong>: 0x0000<\/li>\n<li><strong>\u957f\u5ea6<\/strong>: 0x0006\uff081\u5b57\u8282Unit ID + 1\u5b57\u8282Function Code + 4\u5b57\u8282Data\uff09<\/li>\n<li><strong>\u5355\u5143\u6807\u8bc6\u7b26<\/strong>: 0x01<\/li>\n<li><strong>\u529f\u80fd\u7801<\/strong>: 0x03<\/li>\n<li><strong>\u6570\u636e<\/strong>: 0x0010\uff08\u8d77\u59cb\u5730\u5740\uff09 + 0x0002\uff08\u5bc4\u5b58\u5668\u6570\u91cf\uff09<\/li>\n<\/ul>\n<pre><code>+------------------+------------------+------------------+------------------+------------------+------------------+------------------+------------------+------------------+\n| 0x00             | 0x01             | 0x00             | 0x00             | 0x00             | 0x06             | 0x01             | 0x03             | 0x00             | 0x10             | 0x00             | 0x02             |\n+------------------+------------------+------------------+------------------+------------------+------------------+------------------+------------------+------------------+------------------+------------------+------------------+<\/code><\/pre>\n<h3>\u54cd\u5e94\u5e27\u7ed3\u6784<\/h3>\n<p>\u5982\u679c\u4ece\u8bbe\u5907\u54cd\u5e94\u8bfb\u53d6\u8bf7\u6c42\uff0c\u8fd4\u56de\u7684\u5e27\u7ed3\u6784\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li><strong>\u4e8b\u52a1\u6807\u8bc6\u7b26<\/strong>: 0x0001\uff08\u4e0e\u8bf7\u6c42\u4e00\u81f4\uff09<\/li>\n<li><strong>\u534f\u8bae\u6807\u8bc6\u7b26<\/strong>: 0x0000<\/li>\n<li><strong>\u957f\u5ea6<\/strong>: 0x0005\uff081\u5b57\u8282Unit ID + 1\u5b57\u8282Function Code + 1\u5b57\u8282Byte Count + N\u5b57\u8282Data\uff09<\/li>\n<li><strong>\u5355\u5143\u6807\u8bc6\u7b26<\/strong>: 0x01<\/li>\n<li><strong>\u529f\u80fd\u7801<\/strong>: 0x03<\/li>\n<li><strong>\u5b57\u8282\u8ba1\u6570<\/strong>: 0x04\uff08\u8bfb\u53d62\u4e2a\u5bc4\u5b58\u5668\uff0c\u6bcf\u4e2a\u5bc4\u5b58\u56682\u5b57\u8282\uff09<\/li>\n<li><strong>\u6570\u636e<\/strong>: \u5bc4\u5b58\u5668\u503c\uff08\u6bcf\u4e2a\u5bc4\u5b58\u56682\u5b57\u8282\uff09<\/li>\n<\/ul>\n<p>\u5047\u8bbe\u8bfb\u53d6\u7684\u5bc4\u5b58\u5668\u503c\u4e3a0x1234\u548c0x5678\uff1a<\/p>\n<pre><code>+------------------+------------------+------------------+------------------+------------------+------------------+------------------+------------------+------------------+------------------+------------------+------------------+\n| 0x00             | 0x01             | 0x00             | 0x00             | 0x00             | 0x07             | 0x01             | 0x03             | 0x04             | 0x12             | 0x34             | 0x56             | 0x78             |\n+------------------+------------------+------------------+------------------+------------------+------------------+------------------+------------------+------------------+------------------+------------------+------------------+<\/code><\/pre>\n<p><strong>\u66f4\u591a\u901a\u8baf\u534f\u8bae\u8bf7\u8bbf\u95ee--<\/strong><a href=\"https:\/\/www.rwr.ink\/index.php\/2024\/08\/30\/%e5%b8%b8%e7%94%a8%e7%9a%84%e5%b7%a5%e4%b8%9a%e9%80%9a%e8%ae%af%e5%8d%8f%e8%ae%ae\/\" title=\"\u70b9\u6211\">\u70b9\u51fb\u8df3\u8f6c<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"Modbus TCP\u57fa\u4e8eTCP\/IP\u534f\u8bae\uff0c\u65e0\u9700\u9759\u9ed8\u65f6\u95f4\uff0c\u4f7f\u7528MBAP\u5934\u548cPDU\u4f20\u8f93\u6570\u636e\u3002","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"emotion":"","emotion_color":"","title_style":"","license":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-82","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/www.rwr.ink\/index.php\/wp-json\/wp\/v2\/posts\/82","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.rwr.ink\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.rwr.ink\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.rwr.ink\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.rwr.ink\/index.php\/wp-json\/wp\/v2\/comments?post=82"}],"version-history":[{"count":1,"href":"https:\/\/www.rwr.ink\/index.php\/wp-json\/wp\/v2\/posts\/82\/revisions"}],"predecessor-version":[{"id":83,"href":"https:\/\/www.rwr.ink\/index.php\/wp-json\/wp\/v2\/posts\/82\/revisions\/83"}],"wp:attachment":[{"href":"https:\/\/www.rwr.ink\/index.php\/wp-json\/wp\/v2\/media?parent=82"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.rwr.ink\/index.php\/wp-json\/wp\/v2\/categories?post=82"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.rwr.ink\/index.php\/wp-json\/wp\/v2\/tags?post=82"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}