Read Tag Array

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Web Based Applications using the OPC Web Client Web Service

Objective

The web-page we will create a basic web-page that will simply display the values of an Array-Tag.

This example assumes that you have the Software Toolbox TOPServer installed, and the default project ""simdemo.opf" " is loaded within the TOPServer.

Source Code

JAVASCRIPT

<html>
<head>
<title>OPC Web Client running in IE, using OPC Web Client WEB SERVICE</title>
<SCRIPT LANGUAGE="JScript" src="ArgumentFormat.js"></SCRIPT>
<script language="javascript">

function fnInit()
{
   provider.init();
}

function fnReadResult()
{
   var value = event.error ? "*** " + event.errorMessage : event.outputs.Value;
   document.getElementById(event.info).value = value;
}

function fnRead()
{
   provider.read({ServerClass: "SWToolbox.TOPServer", ItemID: "Channel_1.Device_1.TagArray_1"}, "tagvalue");
}

</script>
</head>

<body onload="fnInit();">
<DIV id="service" style="behavior:url(webservice.htc)"></DIV>
<DIV id="provider" style="behavior:url(eagateway.htc)" webService="service" onReadResult="fnReadResult()"></DIV>
<p>OPC Server: SWToolbox.TOPServer - with modified "simdemo.opf" loaded<br>
<b>Tag Values:</b>
<input type="text" name="tagvalue" value="" size="30">
<input type="button" name="b1" value="read" onClick="fnRead();">
</p>
</body>

</html>

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