|
Please use our Code Center to obtain source-code and example projects/solutions:
http://codecenter.softwaretoolbox.com
|
|
|
|
|
|
|
|
|
|
  Writing to Array Tags using the OPC Web Client ActiveX Controls
The following example shows you how you can create a scripted-application that runs from within Internet Explorer itself.
This example uses the following development languages: vbscript and javascript
Objective
The web-page will have a button only. 10 values will be written to the Array-Tag upon clicking the button. A message will be displayed indicating the success/failure of the write transaction.
This example assumes that you have the Software Toolbox TOPServer installed
along with a customized "simdemo.opf" project that contains Tags of type Array. You can download our test project here..
Source code
In order for our web-page to do anything, we now need to add some scripting that will:
- respond to the button being clicked
- perform the tag read request
- display the value in the textbox
 VBSCRIPT
<html>
<head>
<title>OPC Web Client, writing to an Array-Tag</title>
</head>
<body>
<input type="button" name="b1" value="Write Array">
</body>
<script language="vbscript"> sub b1_onClick
On Error Resume Next
'
'create an array object and assign some values to it
dim objArray(9)
For i=0 To 9
objArray(i) = i
Next
'
'now connect to the opc server and write the value
set opcWebClient = CreateObject("OPCLabs.EasyDA3.0")
opcWebClient.WriteItemValue "", "SWToolbox.TOPServer", "Channel_1.Device_1.TagArray_1", objArray
'
'now check if an error occurred or not
If Err.Number = 0 Then
Msgbox "Ok, successfully wrote to Array Tag"
Else
Msgbox "Error: " & Err.Number & ", " & Err.Description
End If
end sub </script>
</html>
Simply place the above text under the "</body>" HTML tag and then save your HTML page. Now open that web-page directly from Internet Explorer and then click on the button.
JAVASCRIPT
Feature not currently supported within Javascript due to the differences in Array handling for this development language. This feature will be made available in the next product release.
|
|
|
|
|
|
|
|
|
Sign-up to our newsletter to receive product updates & other important information.