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KeepAlive&#xff0c;\u9ed8\u8ba4\u5468\u671f\u592a\u957f&#xff0c;\u5de5\u4e1a\u573a\u666f\u5b8c\u5168\u4e0d\u9002\u7528<\/li>\n<hr \/>\n<h3>\u6570\u636e\u89e3\u6790\u7c7b\u5669\u68a6&#xff1a;\u5168\u662f\u9519\u503c\u7684\u8ff7\u60d1<\/h3>\n<h4>\u5669\u68a6\u4e94&#xff1a;\u6570\u503c\u6c38\u8fdc\u5bf9\u4e0d\u4e0a\u2014\u2014\u5730\u5740\u504f\u79fb\u7b97\u9519\u4e00\u6b65\u5dee\u5343\u91cc<\/h4>\n<h5>\u8e29\u5751\u73b0\u573a<\/h5>\n<p>\u786e\u8ba4\u4e86DB\u5757\u3001\u5173\u95ed\u4e86\u4f18\u5316&#xff0c;\u8bfb\u51fa\u6765\u7684\u6570\u503c\u8fd8\u662f\u4e0d\u5bf9&#xff0c;\u8981\u4e48\u5dee\u4e00\u4e2a\u4f4d\u7f6e&#xff0c;\u8981\u4e48\u6570\u503c\u5927\u5c0f\u5b8c\u5168\u79bb\u8c31\u3002\u53cd\u590d\u6838\u5bf9\u5730\u5740&#xff0c;\u611f\u89c9\u81ea\u5df1\u7b97\u7684\u6ca1\u9519&#xff0c;\u4f46\u7ed3\u679c\u5c31\u662f\u4e0d\u5bf9\u3002<\/p>\n<h5>\u6839\u56e0\u63ed\u79d8<\/h5>\n<p>S7\u7684\u5730\u5740\u89c4\u5219\u6709\u4e24\u4e2a\u5bb9\u6613\u6df7\u6dc6\u7684\u70b9&#xff1a;<\/p>\n<li>\u5b57\u8282\u3001\u5b57\u3001\u53cc\u5b57\u7684\u8d77\u59cb\u4f4d\u7f6e&#xff1a;DB1.DBD0\u7531DB1.DBW0&#xff08;\u9ad8\u5b57&#xff09;\u548cDB1.DBW2&#xff08;\u4f4e\u5b57&#xff09;\u7ec4\u6210&#xff0c;\u53604\u5b57\u8282&#xff1b;DB1.DBW0\u7531DBB0\u548cDBB1\u7ec4\u6210\u3002\u5f88\u591a\u4eba\u4f1a\u8bef\u4ee5\u4e3aDBD0\u5305\u542bDBW0\u548cDBW1&#xff0c;\u5dee\u4e00\u4e2a\u5b57\u8282\u5168\u9519\u3002<\/li>\n<li>1\u8d77\u59cb\u548c0\u8d77\u59cb\u6df7\u6dc6&#xff1a;\u6709\u4e9b\u6587\u6863\u6807\u6ce8\u7684\u662f1\u8d77\u59cb\u7684\u53d8\u91cf\u5e8f\u53f7&#xff0c;\u534f\u8bae\u5e27\u91cc\u662f0\u8d77\u59cb\u7684\u504f\u79fb\u91cf&#xff0c;\u5dee1\u4e2a\u4f4d\u7f6e\u3002<\/li>\n<h5>\u907f\u5751\u65b9\u6848<\/h5>\n<li>\u535a\u9014\u6253\u5f00DB\u5757&#xff0c;\u5207\u6362\u5230\u300c\u504f\u79fb\u91cf\u89c6\u56fe\u300d&#xff0c;\u76f4\u63a5\u770b\u7cfb\u7edf\u663e\u793a\u7684\u7edd\u5bf9\u504f\u79fb&#xff0c;\u4e0d\u8981\u81ea\u5df1\u7b97<\/li>\n<li>\u8c03\u8bd5\u65f6\u5148\u8bfb\u5355\u4e2a\u5b57\u8282\u3001\u5355\u4e2a\u5b57\u9a8c\u8bc1&#xff0c;\u786e\u8ba4\u5730\u5740\u6b63\u786e\u518d\u8bfb\u591a\u5b57\u8282\u7c7b\u578b<\/li>\n<li>\u7528\u5df2\u77e5\u503c\u6821\u51c6&#xff1a;\u5f80PLC\u91cc\u5199\u4e00\u4e2a\u56fa\u5b9a\u503c&#xff08;\u6bd4\u5982100&#xff09;&#xff0c;\u8bfb\u51fa\u6765\u5bf9\u6bd4&#xff0c;\u80fd\u6700\u5feb\u5b9a\u4f4d\u5730\u5740\u9519\u8bef<\/li>\n<hr \/>\n<h4>\u5669\u68a6\u516d&#xff1a;\u6d6e\u70b9\u6570\u5168\u662f\u79bb\u8c31\u503c\u2014\u2014\u5b57\u8282\u5e8f\u4e0e\u5b57\u5e8f\u7684\u53cc\u91cd\u9677\u9631<\/h4>\n<h5>\u8e29\u5751\u73b0\u573a<\/h5>\n<p>16\u4f4d\u6574\u6570\u8bfb\u7684\u90fd\u5bf9&#xff0c;\u4e00\u8bfb32\u4f4d\u6d6e\u70b9\u6570\u5c31\u5168\u662f\u79bb\u8c31\u503c&#xff0c;\u8981\u4e48\u662f\u5929\u6587\u6570\u5b57&#xff0c;\u8981\u4e48\u662fNaN\u3002\u5b57\u8282\u53cd\u8f6c\u4e86\u4e5f\u4e0d\u5bf9&#xff0c;\u600e\u4e48\u8c03\u90fd\u8c03\u4e0d\u5bf9\u3002<\/p>\n<h5>\u6839\u56e0\u63ed\u79d8<\/h5>\n<p>\u897f\u95e8\u5b50S7\u7cfb\u5217\u662f\u6807\u51c6\u5927\u7aef\u5e8f&#xff08;\u9ad8\u5b57\u8282\u5728\u524d&#xff09;&#xff0c;\u4f4632\u4f4d\u6570\u636e\u7684\u5b57\u5e8f\u5f88\u5bb9\u6613\u8e29\u5751&#xff1a;<\/p>\n<ul>\n<li>32\u4f4d\u6d6e\u70b9\u6570\/\u6574\u6570\u7684\u5b58\u50a8\u89c4\u5219&#xff1a;\u9ad8\u5b57\u5728\u524d&#xff0c;\u4f4e\u5b57\u5728\u540e&#xff1b;\u6bcf\u4e2a\u5b57\u5185\u90e8\u4e5f\u662f\u9ad8\u5b57\u8282\u5728\u524d<\/li>\n<li>\u5f88\u591a\u4eba\u53ea\u53cd\u8f6c\u4e86\u6574\u4f53\u5b57\u8282\u5e8f&#xff0c;\u6216\u8005\u53ea\u53cd\u8f6c\u4e86\u5b57\u5185\u5b57\u8282&#xff0c;\u7ed3\u679c\u600e\u4e48\u8f6c\u90fd\u4e0d\u5bf9<\/li>\n<li>\u4e0d\u540c\u7b2c\u4e09\u65b9\u5e93\u7684\u9ed8\u8ba4\u8f6c\u6362\u89c4\u5219\u4e0d\u4e00\u6837&#xff0c;\u6df7\u7528\u5e93\u5f88\u5bb9\u6613\u8e29\u96f7<\/li>\n<\/ul>\n<h5>\u907f\u5751\u65b9\u6848<\/h5>\n<li>\u6807\u51c6\u8f6c\u6362\u65b9\u6cd5&#xff1a;\u4ee5DBD0\u4e3a\u4f8b&#xff0c;4\u4e2a\u5b57\u8282\u4ece\u4f4e\u5230\u9ad8\u4f9d\u6b21\u4e3abyte0\u3001byte1\u3001byte2\u3001byte3&#xff0c;\u6b63\u786e\u7684\u6d6e\u70b9\u6570\u62fc\u63a5\u987a\u5e8f\u662f byte0 byte1 byte2 byte3 \u2192 \u6807\u51c6\u5927\u7aef\u8f6cfloat<\/li>\n<li>\u6c38\u8fdc\u7528\u5df2\u77e5\u503c\u6821\u51c6&#xff1a;PLC\u91cc\u51991.0&#xff0c;\u8bfb4\u4e2a\u5b57\u8282\u51fa\u6765&#xff0c;\u56db\u79cd\u6392\u5217\u65b9\u5f0f\u90fd\u8bd5\u4e00\u904d&#xff0c;\u54ea\u79cd\u5bf9\u5f97\u4e0a\u5c31\u7528\u54ea\u79cd<\/li>\n<li>\u5c01\u88c5\u7edf\u4e00\u7684\u8f6c\u6362\u5de5\u5177\u7c7b&#xff0c;\u6240\u6709\u6570\u636e\u89e3\u6790\u8d70\u540c\u4e00\u4e2a\u5165\u53e3&#xff0c;\u4e0d\u8981\u5230\u5904\u5199\u8f6c\u6362\u4ee3\u7801<\/li>\n<p><span class=\"token comment\">\/\/ \u897f\u95e8\u5b50S7\u6807\u51c6\u5927\u7aef\u6d6e\u70b9\u6570\u8f6c\u6362<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token return-type class-name\"><span class=\"token keyword\">float<\/span><\/span> <span class=\"token function\">ToFloatS7<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\"><span class=\"token keyword\">byte<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><\/span> buffer<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\"><span class=\"token keyword\">int<\/span><\/span> startIndex<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\"><span class=\"token keyword\">byte<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><\/span> temp <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token constructor-invocation class-name\"><span class=\"token keyword\">byte<\/span><\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u897f\u95e8\u5b50&#xff1a;\u9ad8\u5b57\u5728\u524d&#xff0c;\u9ad8\u5b57\u8282\u5728\u524d<\/span><br \/>\n    temp<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> buffer<span class=\"token punctuation\">[<\/span>startIndex<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    temp<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> buffer<span class=\"token punctuation\">[<\/span>startIndex <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    temp<span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> buffer<span class=\"token punctuation\">[<\/span>startIndex <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    temp<span class=\"token punctuation\">[<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> buffer<span class=\"token punctuation\">[<\/span>startIndex <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>BitConverter<span class=\"token punctuation\">.<\/span>IsLittleEndian<span class=\"token punctuation\">)<\/span><br \/>\n        Array<span class=\"token punctuation\">.<\/span><span class=\"token function\">Reverse<\/span><span class=\"token punctuation\">(<\/span>temp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> BitConverter<span class=\"token punctuation\">.<\/span><span class=\"token function\">ToSingle<\/span><span class=\"token punctuation\">(<\/span>temp<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<hr \/>\n<h4>\u5669\u68a6\u4e03&#xff1a;\u5f00\u5173\u91cf\u72b6\u6001\u5168\u53cd\u4e86\u2014\u2014\u4f4d\u5e8f\u7684\u53cd\u5e38\u8bc6\u8bbe\u8ba1<\/h4>\n<h5>\u8e29\u5751\u73b0\u573a<\/h5>\n<p>\u8bfb\u5b57\u8282\u6ca1\u95ee\u9898&#xff0c;\u89e3\u6790\u5355\u4e2a\u4f4d\u7684\u65f6\u5019\u5168\u4e71\u4e86\u3002DB1.DBX0.0\u660e\u660e\u662fTrue&#xff0c;\u8bfb\u51fa\u6765\u662fFalse&#xff1b;\u4ee5\u4e3a\u662f\u7b2c0\u4f4d&#xff0c;\u5b9e\u9645\u8bfb\u5230\u7684\u662f\u7b2c7\u4f4d\u3002\u600e\u4e48\u8c03\u90fd\u5bf9\u4e0d\u4e0a&#xff0c;\u6000\u7591\u4eba\u751f\u3002<\/p>\n<h5>\u6839\u56e0\u63ed\u79d8<\/h5>\n<p>\u8fd9\u662fS7\u6700\u53cd\u5e38\u8bc6\u7684\u4e00\u4e2a\u8bbe\u8ba1&#xff1a;\u5b57\u8282\u5185\u7684\u4f4d\u7f16\u53f7&#xff0c;\u662f\u4ece\u9ad8\u4f4d\u5230\u4f4e\u4f4d\u6392\u5217\u7684\u3002<\/p>\n<ul>\n<li>\u6211\u4eec\u5e38\u89c4\u8ba4\u77e5&#xff1a;bit0\u662f\u6700\u4f4e\u4f4d&#xff08;\u503c1&#xff09;&#xff0c;bit7\u662f\u6700\u9ad8\u4f4d&#xff08;\u503c128&#xff09;<\/li>\n<li>\u897f\u95e8\u5b50\u89c4\u5219&#xff1a;DBX0.0\u5bf9\u5e94\u6700\u9ad8\u4f4d&#xff08;\u503c128&#xff09;&#xff0c;DBX0.7\u5bf9\u5e94\u6700\u4f4e\u4f4d&#xff08;\u503c1&#xff09;<\/li>\n<\/ul>\n<p>\u7b80\u5355\u8bf4&#xff0c;\u4f4d\u53f7\u548c\u6211\u4eec\u4e60\u60ef\u7684\u987a\u5e8f\u5b8c\u5168\u662f\u53cd\u7684\u3002<\/p>\n<h5>\u907f\u5751\u65b9\u6848<\/h5>\n<li>\u4f4d\u8bfb\u53d6\u65f6&#xff0c;\u4f4d\u53f7\u505a\u4e00\u6b21\u53cd\u8f6c&#xff1a;int realBit &#061; 7 &#8211; bitIndex;<\/li>\n<li>\u7528\u5df2\u77e5\u70b9\u4f4d\u9a8c\u8bc1&#xff1a;\u5f3a\u5236DBX0.0\u4e3aTrue&#xff0c;\u8bfb\u5b57\u8282\u770b\u662f\u4e0d\u662f0x80&#xff08;128&#xff09;&#xff0c;\u786e\u8ba4\u4f4d\u5e8f<\/li>\n<li>\u5c01\u88c5\u7edf\u4e00\u7684\u4f4d\u64cd\u4f5c\u65b9\u6cd5&#xff0c;\u4e1a\u52a1\u5c42\u4e0d\u7528\u5173\u5fc3\u5e95\u5c42\u987a\u5e8f<\/li>\n<p><span class=\"token comment\">\/\/ \u6b63\u786e\u8bfb\u53d6S7\u4f4d\u72b6\u6001<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token return-type class-name\"><span class=\"token keyword\">bool<\/span><\/span> <span class=\"token function\">GetBitS7<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\"><span class=\"token keyword\">byte<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><\/span> buffer<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\"><span class=\"token keyword\">int<\/span><\/span> byteIndex<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\"><span class=\"token keyword\">int<\/span><\/span> bitIndex<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>bitIndex <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">||<\/span> bitIndex <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">7<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">throw<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token constructor-invocation class-name\">ArgumentOutOfRangeException<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">nameof<\/span><span class=\"token punctuation\">(<\/span>bitIndex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u897f\u95e8\u5b50\u4f4d\u5e8f&#xff1a;0\u5bf9\u5e94\u6700\u9ad8\u4f4d&#xff0c;7\u5bf9\u5e94\u6700\u4f4e\u4f4d<\/span><br \/>\n    <span class=\"token class-name\"><span class=\"token keyword\">int<\/span><\/span> realBit <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">7<\/span> <span class=\"token operator\">&#8211;<\/span> bitIndex<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">(<\/span>buffer<span class=\"token punctuation\">[<\/span>byteIndex<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&amp;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span> <span class=\"token operator\">&lt;&lt;<\/span> realBit<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<hr \/>\n<h4>\u5669\u68a6\u516b&#xff1a;\u5c11\u91cf\u6b63\u5e38&#xff0c;\u591a\u8bfb\u5c31\u62a5\u9519\u2014\u2014PDU\u957f\u5ea6\u5929\u82b1\u677f<\/h4>\n<h5>\u8e29\u5751\u73b0\u573a<\/h5>\n<p>\u8bfb\u5341\u51e0\u4e2a\u5bc4\u5b58\u5668\u6b63\u5e38&#xff0c;\u4e00\u6b21\u6027\u8bfb\u4e00\u4e24\u767e\u4e2a\u5bc4\u5b58\u5668\u5c31\u62a5\u9519&#xff0c;\u8fd4\u56de\u65e0\u6548\u5730\u5740\u6216\u6570\u636e\u957f\u5ea6\u9519\u8bef\u3002\u4ee5\u4e3a\u662f\u5730\u5740\u8d8a\u754c&#xff0c;\u67e5\u4e86\u534a\u5929DB\u5757\u957f\u5ea6\u5b8c\u5168\u8db3\u591f\u3002<\/p>\n<h5>\u6839\u56e0\u63ed\u79d8<\/h5>\n<p>S7\u534f\u8bae\u5355\u5e27\u7684\u7528\u6237\u6570\u636e\u957f\u5ea6\u53d7PDU&#xff08;\u534f\u8bae\u6570\u636e\u5355\u5143&#xff09;\u9650\u5236&#xff0c;S7-1200\u5355\u5e27\u6700\u5927\u7528\u6237\u6570\u636e\u7ea6240\u5b57\u8282&#xff0c;\u4e5f\u5c31\u662f\u6700\u591a\u8bfb120\u4e2a\u5b57\u3002\u8d85\u8fc7\u8fd9\u4e2a\u957f\u5ea6&#xff0c;PLC\u4f1a\u76f4\u63a5\u8fd4\u56de\u9519\u8bef\u3002\u4e0d\u540c\u578b\u53f7\u3001\u4e0d\u540c\u56fa\u4ef6\u7248\u672c\u7684PDU\u4e0a\u9650\u7565\u6709\u5dee\u5f02&#xff0c;\u4f46\u90fd\u6709\u5929\u82b1\u677f\u3002<\/p>\n<h5>\u907f\u5751\u65b9\u6848<\/h5>\n<li>\u957f\u8bfb\u53d6\u81ea\u52a8\u62c6\u5206&#xff1a;\u8ba1\u7b97\u5355\u6b21\u6700\u5927\u53ef\u8bfb\u957f\u5ea6&#xff0c;\u8d85\u8fc7\u5c31\u81ea\u52a8\u62c6\u5206\u6210\u591a\u6b21\u8bf7\u6c42&#xff0c;\u8bfb\u5b8c\u518d\u5408\u5e76<\/li>\n<li>\u5efa\u7acb\u8fde\u63a5\u65f6\u4e3b\u52a8\u534f\u5546PDU\u5927\u5c0f&#xff0c;\u53d6\u53cc\u65b9\u652f\u6301\u7684\u6700\u5c0f\u503c<\/li>\n<li>\u4e0d\u8981\u8d2a\u591a\u4e00\u6b21\u6027\u5168\u8bfb&#xff0c;\u6309\u533a\u57df\u3001\u6309\u529f\u80fd\u5206\u6279\u8bfb\u53d6&#xff0c;\u53cd\u800c\u66f4\u7a33\u5b9a<\/li>\n<p><span class=\"token comment\">\/\/ \u81ea\u52a8\u62c6\u5206\u957f\u8bfb\u53d6<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token return-type class-name\"><span class=\"token keyword\">ushort<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><\/span> <span class=\"token function\">ReadDbSafe<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\"><span class=\"token keyword\">int<\/span><\/span> dbNumber<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\"><span class=\"token keyword\">int<\/span><\/span> startAddr<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\"><span class=\"token keyword\">int<\/span><\/span> count<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> <span class=\"token class-name\"><span class=\"token keyword\">int<\/span><\/span> maxPerRequest <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">120<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5355\u6b21\u6700\u5927120\u4e2a\u5b57<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>count <span class=\"token operator\">&lt;&#061;<\/span> maxPerRequest<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token function\">ReadDb<\/span><span class=\"token punctuation\">(<\/span>dbNumber<span class=\"token punctuation\">,<\/span> startAddr<span class=\"token punctuation\">,<\/span> count<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token class-name\">List<span class=\"token punctuation\">&lt;<\/span><span class=\"token keyword\">ushort<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> result <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\"><span class=\"token keyword\">int<\/span><\/span> remaining <span class=\"token operator\">&#061;<\/span> count<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\"><span class=\"token keyword\">int<\/span><\/span> current <span class=\"token operator\">&#061;<\/span> startAddr<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>remaining <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\"><span class=\"token keyword\">int<\/span><\/span> readCount <span class=\"token operator\">&#061;<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">Min<\/span><span class=\"token punctuation\">(<\/span>remaining<span class=\"token punctuation\">,<\/span> maxPerRequest<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        result<span class=\"token punctuation\">.<\/span><span class=\"token function\">AddRange<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">ReadDb<\/span><span class=\"token punctuation\">(<\/span>dbNumber<span class=\"token punctuation\">,<\/span> current<span class=\"token punctuation\">,<\/span> readCount<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        current <span class=\"token operator\">&#043;&#061;<\/span> readCount<span class=\"token punctuation\">;<\/span><br \/>\n        remaining <span class=\"token operator\">-&#061;<\/span> readCount<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> result<span class=\"token punctuation\">.<\/span><span class=\"token function\">ToArray<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<hr \/>\n<h3>\u7a33\u5b9a\u6027\u5669\u68a6&#xff1a;\u8dd1\u7740\u8dd1\u7740\u5c31\u5d29\u4e86<\/h3>\n<h4>\u5669\u68a6\u4e5d&#xff1a;\u591a\u7ebf\u7a0b\u4e00\u8dd1\u5c31\u4e71\u5957\u2014\u2014\u8fde\u63a5\u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684<\/h4>\n<h5>\u8e29\u5751\u73b0\u573a<\/h5>\n<p>\u5355\u7ebf\u7a0b\u8bfb\u5199\u4e00\u5207\u6b63\u5e38&#xff0c;\u4e1a\u52a1\u590d\u6742\u4e86\u52a0\u51e0\u4e2a\u7ebf\u7a0b\u540c\u65f6\u8bfb\u5199&#xff0c;\u5c31\u5f00\u59cb\u968f\u673a\u62a5\u9519\u3001\u6570\u636e\u9519\u4f4d\u3001\u751a\u81f3\u76f4\u63a5\u65ad\u8fde\u3002\u65f6\u597d\u65f6\u574f&#xff0c;\u590d\u73b0\u65e0\u89c4\u5f8b&#xff0c;\u6392\u67e5\u6781\u5176\u56f0\u96be\u3002<\/p>\n<h5>\u6839\u56e0\u63ed\u79d8<\/h5>\n<p>S7\u8fde\u63a5\u662f\u534a\u53cc\u5de5\u7684&#xff0c;\u540c\u4e00\u65f6\u95f4\u53ea\u80fd\u6709\u4e00\u4e2a\u8bf7\u6c42\u5728\u9014\u3002\u591a\u7ebf\u7a0b\u540c\u65f6\u53d1\u8bf7\u6c42&#xff0c;\u62a5\u6587\u4f1a\u5728TCP\u6d41\u91cc\u7c98\u5728\u4e00\u8d77&#xff0c;\u4e24\u8fb9\u89e3\u6790\u5168\u4e71&#xff0c;\u8f7b\u5219\u6570\u636e\u9519&#xff0c;\u91cd\u5219\u8fde\u63a5\u76f4\u63a5\u6302\u6389\u3002\u51e0\u4e4e\u6240\u6709\u5f00\u6e90S7\u5e93\u90fd\u4e0d\u4f1a\u5e2e\u4f60\u5904\u7406\u5e76\u53d1&#xff0c;\u76f4\u63a5\u591a\u7ebf\u7a0b\u8c03\u7528\u5fc5\u8e29\u5751\u3002<\/p>\n<h5>\u907f\u5751\u65b9\u6848<\/h5>\n<li>\u8bf7\u6c42\u961f\u5217\u4e32\u884c\u5316&#xff1a;\u6240\u6709\u8bfb\u5199\u8bf7\u6c42\u7edf\u4e00\u8fdb\u961f\u5217&#xff0c;\u5355\u7ebf\u7a0b\u6d88\u8d39&#xff0c;\u4e00\u6b21\u53ea\u53d1\u4e00\u4e2a\u8bf7\u6c42&#xff0c;\u6536\u5230\u54cd\u5e94\u518d\u53d1\u4e0b\u4e00\u4e2a<\/li>\n<li>\u52a0\u9501\u4fdd\u62a4&#xff1a;\u7b80\u5355\u573a\u666f\u7528lock\u628a\u6574\u4e2a\u8bfb\u5199\u8fc7\u7a0b\u9501\u4f4f&#xff0c;\u4fdd\u8bc1\u540c\u4e00\u65f6\u95f4\u53ea\u6709\u4e00\u4e2a\u8bf7\u6c42<\/li>\n<li>\u4e0d\u8981\u4e3a\u4e86\u201c\u63d0\u9ad8\u6548\u7387\u201d\u76f2\u76ee\u5f00\u591a\u7ebf\u7a0b&#xff0c;PLC\u5904\u7406\u80fd\u529b\u6709\u9650&#xff0c;\u4e32\u884c\u53cd\u800c\u6700\u7a33\u5b9a\u6700\u5feb<\/li>\n<p><span class=\"token keyword\">private<\/span> <span class=\"token keyword\">readonly<\/span> <span class=\"token class-name\"><span class=\"token keyword\">object<\/span><\/span> _commLock <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token return-type class-name\"><span class=\"token keyword\">ushort<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><\/span> <span class=\"token function\">SafeRead<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\"><span class=\"token keyword\">int<\/span><\/span> db<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\"><span class=\"token keyword\">int<\/span><\/span> addr<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\"><span class=\"token keyword\">int<\/span><\/span> count<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">lock<\/span> <span class=\"token punctuation\">(<\/span>_commLock<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u6574\u4e2a\u8bfb\u5199\u8fc7\u7a0b\u5728\u9501\u5185\u6267\u884c<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token function\">ReadDbRaw<\/span><span class=\"token punctuation\">(<\/span>db<span class=\"token punctuation\">,<\/span> addr<span class=\"token punctuation\">,<\/span> count<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<hr \/>\n<h4>\u5669\u68a6\u5341&#xff1a;PLC\u5207STOP\u5c31\u901a\u4fe1\u6545\u969c\u2014\u2014\u8fd0\u884c\u6a21\u5f0f\u7684\u9690\u5f62\u5f71\u54cd<\/h4>\n<h5>\u8e29\u5751\u73b0\u573a<\/h5>\n<p>PLC\u5207\u5230STOP\u6a21\u5f0f\u540e&#xff0c;\u4e0a\u4f4d\u673a\u8981\u4e48\u76f4\u63a5\u65ad\u8fde&#xff0c;\u8981\u4e48\u8bfb\u51fa\u6765\u5168\u662f0&#xff0c;\u548c\u771f\u65ad\u7ebf\u4e00\u6a21\u4e00\u6837\u3002\u65e0\u6cd5\u533a\u5206\u662fPLC\u505c\u673a\u4e86\u8fd8\u662f\u901a\u4fe1\u65ad\u4e86&#xff0c;\u62a5\u8b66\u7cfb\u7edf\u8bef\u62a5\u4e00\u5806\u3002<\/p>\n<h5>\u6839\u56e0\u63ed\u79d8<\/h5>\n<p>S7-1200\u5728STOP\u6a21\u5f0f\u4e0b&#xff0c;\u90e8\u5206\u901a\u4fe1\u8fde\u63a5\u4f1a\u4fdd\u6301&#xff0c;\u4f46\u7528\u6237\u7a0b\u5e8f\u505c\u6b62\u8fd0\u884c&#xff0c;\u8fc7\u7a0b\u6620\u50cf\u533a\u3001DB\u5757\u6570\u636e\u4e0d\u518d\u5237\u65b0&#xff0c;\u90e8\u5206\u533a\u57df\u751a\u81f3\u65e0\u6cd5\u8bfb\u53d6\u3002\u5f88\u591a\u7a0b\u5e8f\u4e0d\u505a\u72b6\u6001\u533a\u5206&#xff0c;\u76f4\u63a5\u5224\u5b9a\u4e3a\u901a\u4fe1\u6545\u969c\u3002<\/p>\n<h5>\u907f\u5751\u65b9\u6848<\/h5>\n<li>\u8bfb\u53d6PLC\u8fd0\u884c\u72b6\u6001\u5b57&#xff0c;\u533a\u5206\u300c\u8fd0\u884c\u300d\u300c\u505c\u6b62\u300d\u300c\u901a\u4fe1\u4e2d\u65ad\u300d\u4e09\u79cd\u72b6\u6001<\/li>\n<li>STOP\u6a21\u5f0f\u4e0b\u663e\u793a\u201cPLC\u505c\u673a\u201d&#xff0c;\u4e0d\u89e6\u53d1\u901a\u4fe1\u6545\u969c\u544a\u8b66<\/li>\n<li>\u5173\u952e\u63a7\u5236\u903b\u8f91\u589e\u52a0\u6a21\u5f0f\u6821\u9a8c&#xff0c;STOP\u6a21\u5f0f\u4e0b\u7981\u6b62\u4e0b\u53d1\u63a7\u5236\u6307\u4ee4&#xff0c;\u907f\u514d\u8bef\u52a8\u4f5c<\/li>\n<hr 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