Question

专家，

有没有人成功建立了Allen Bradley的1768-EWEB模块？我的问题的范围是网页之间的通信，它将更新保存在EWEB模块内的目录下的xml文件;然后由模块读取并传送回PLC。

手册非常具体，唯一的方法是使用＆＃34;网页表单和POST处理程序＆＃34;。

手册中提供的代码示例如下：

<html>
    <head>
      <title>
        Data View Javascript Demo Page
      </title>
      <script type="text/javascript">
    var xmlDoc;
    var xmlhttp;
    var DATAVIEW_URI = "/user/system/dataviews/Sample.xml";
    var DATAVIEW_NAMESPACE = "http://www.rockwellautomation.com/technologies/data_access/data_views/1.0/";
    var DATATYPES_NAMESPACE = "http://www.rockwellautomation.com/technologies/data_access/data_types/1.0/";
    var ARR_ACTIVEX = ["MSXML4.DOMDocument", "MSXML3.DOMDocument", "MSXML2.DOMDocument", "MSXML.DOMDocument",
    "Microsoft.XmlDom"];
    var STR_ACTIVEX = "";
    var isIE = navigator.userAgent.toLowerCase().indexOf("msie") > -1;
    if (isIE) {
    var bFound = false;
    for (var i=0; i < ARR_ACTIVEX.length && !bFound; i++) {
    try {
    var objXML = new ActiveXObject(ARR_ACTIVEX[i]);
    STR_ACTIVEX = ARR_ACTIVEX[i];
    bFound = true
    } catch (objException) {}
    }
    if (!bFound) {
    /* No DOM found, so throw a message and go back */
    alert("Creating/editing a data view requires Internet Explorer 5.5 or greater with XML support. Please
    upgrade your browser or load the appropriate patches to support XML.");
    history.go(-1);
    }
    } else {
    /* Not IE, so throw a message and go back */
    alert("Creating/editing a data view requires Internet Explorer 5.5 or greater with XML support. Please
    upgrade your browser or load the appropriate patches to support XML.");
    history.go(-1);
    }
    xmlDoc = new ActiveXObject(STR_ACTIVEX)
    xmlDoc.async = false;
    xmlDoc.setProperty("SelectionLanguage", "XPath");
    if (STR_ACTIVEX.indexOf(".DOMDocument") != -1) {
    xmlhttp = new ActiveXObject(STR_ACTIVEX.substring(0, STR_ACTIVEX.indexOf(".DOMDocument")) +
    ".XMLHTTP");
    } else {
    alert("Creating/editing a data view requires Internet Explorer 5.5 or greater with XML support. Please
    upgrade your browser or load the appropriate patches to support XML.");
    history.go(-1);
    }
    function refresh_value() {
    xmlDoc.load(DATAVIEW_URI);
    xmlDoc.setProperty("SelectionNamespaces", "xmlns:dv='" + DATAVIEW_NAMESPACE + "'");
    document.getElementById("tagvalue").value =
    xmlDoc.selectSingleNode("/dv:view/dv:tag[@name='TEST']/dv:value").childNodes[0].nodeValue;
    }
    function update_value() {
    xmlDoc.selectSingleNode("/dv:view/dv:tag[@name='TEST']/dv:value").childNodes[0].nodeValue =
    document.getElementById("tagvalue").value;
    xmlhttp.Open("POST", DATAVIEW_URI, false);
    xmlhttp.Send(xmlDoc);
    refresh_value();
    }
    </script>
    </head>
    <body onLoad="refresh_value();">
    TEST value is <input type="text" name="tagvalue" id="tagvalue" /><br/>
    <input type="button" onClick="refresh_value();" value="Refresh"/><input type="button"
    onClick="update_value();" value="Update"/>
    </body>
    </html>

当我测试上面的代码时（在IE 10上），它不起作用。字段表单为空白。根据手册，它应该显示125.（在向导中创建xml的步骤已经完成）。

有没有人有机会使用此网络模块？该设备来自2004-2006，它只处理.asp作为服务器端语言。

提前谢谢。

Answer 1

将原始代码复制到test.html文件中并在IE10中打开后，如你所说它不起作用。我发现脚本中有换行符会导致它变得无效 - 尤其是alert(" ")中的字符串文字。我在过去发现，从手册，pdf和帮助文件中复制可能包含不需要的字符，因此请使用优秀的代码编辑器仔细检查。它还有助于设置缩进，以便您可以轻松查看代码中发生的情况。

<html>
<head>
    <title>
        Data View Javascript Demo Page
    </title>
    <script type="text/javascript">
    var xmlDoc;
    var xmlhttp;
    var DATAVIEW_URI = "/user/system/dataviews/Sample.xml";
    var DATAVIEW_NAMESPACE = "http://www.rockwellautomation.com/technologies/data_access/data_views/1.0/";
    var DATATYPES_NAMESPACE = "http://www.rockwellautomation.com/technologies/data_access/data_types/1.0/";
    var ARR_ACTIVEX = ["MSXML4.DOMDocument", "MSXML3.DOMDocument", "MSXML2.DOMDocument", "MSXML.DOMDocument", "Microsoft.XmlDom"];
    var STR_ACTIVEX = "";
    var isIE = navigator.userAgent.toLowerCase().indexOf("msie") > -1;
    if (isIE) {
        var bFound = false;
        for (var i=0; i < ARR_ACTIVEX.length && !bFound; i++) {
            try {
                var objXML = new ActiveXObject(ARR_ACTIVEX[i]);
                STR_ACTIVEX = ARR_ACTIVEX[i];
                bFound = true
            } catch (objException) {}
        }
        if (!bFound) {
            /* No DOM found, so throw a message and go back */
            alert("Creating/editing a data view requires Internet Explorer 5.5 or greater with XML support. Please upgrade your browser or load the appropriate patches to support XML.");
            history.go(-1);
        }
    } else {
        /* Not IE, so throw a message and go back */
        alert("Creating/editing a data view requires Internet Explorer 5.5 or greater with XML support. Please upgrade your browser or load the appropriate patches to support XML.");
        history.go(-1);
    }
    xmlDoc = new ActiveXObject(STR_ACTIVEX)
    xmlDoc.async = false;
    xmlDoc.setProperty("SelectionLanguage", "XPath");
    if (STR_ACTIVEX.indexOf(".DOMDocument") != -1) {
        xmlhttp = new ActiveXObject(STR_ACTIVEX.substring(0, STR_ACTIVEX.indexOf(".DOMDocument")) + ".XMLHTTP");
    } else {
        alert("Creating/editing a data view requires Internet Explorer 5.5 or greater with XML support. Please upgrade your browser or load the appropriate patches to support XML.");
        history.go(-1);
    }
    function refresh_value() {
        xmlDoc.load(DATAVIEW_URI);
        xmlDoc.setProperty("SelectionNamespaces", "xmlns:dv='" + DATAVIEW_NAMESPACE + "'");
        document.getElementById("tagvalue").value =
        xmlDoc.selectSingleNode("/dv:view/dv:tag[@name='TEST']/dv:value").childNodes[0].nodeValue;
    }
    function update_value() {
        xmlDoc.selectSingleNode("/dv:view/dv:tag[@name='TEST']/dv:value").childNodes[0].nodeValue =
        document.getElementById("tagvalue").value;
        xmlhttp.Open("POST", DATAVIEW_URI, false);
        xmlhttp.Send(xmlDoc);
        refresh_value();
    }
    </script>
</head>
<body onLoad="refresh_value();">
    TEST value is <input type="text" name="tagvalue" id="tagvalue" /><br/>
    <input type="button" onClick="refresh_value();" value="Refresh"/>
    <input type="button" onClick="update_value();" value="Update"/>
</body>
</html>

现在您的下一个障碍是获取浏览器来运行该代码，因为IE10可能不支持ActiveX。这是一个不同的问题，但是......

使用Allen Bradley 1768-EWEB模块在自定义网页之间进行通信

1 个答案: