How to read an OPC-UA node value in Excel

From QuickOPC Knowledge Base
Jump to: navigation, search

This is the simplest Excel VBA example. It reads an OPC-UA node value and stores it in a cell of a worksheet.

Step 1: Create a new Excel worksheet, and select Developer -> Visual Basic from the ribbon:

Howtoreadanopcuanodevalueinexcel-1.png

Step 2. In “Microsoft Visual Basic for Applications” window, select Tools -> References, check the box next to "OPC Labs EasyOPC-UA Library" (in versions up to 5.40, "OPC Labs EasyOPC-UA Type Library"), and press OK:

Howtoreadanopcuanodevalueinexcel-2.png

Step 3. Select and double-click This Workbook in the project tree, and then add a handler for opening the workbook by selecting Workbook and Open from the drop-downs on the top of the code window:

Howtoreadanopcuanodevalueinexcel-3.png

Step 4. Enter the code for the handler as follows:

   ' Create EasyOPC-UA component
   Dim Client As New EasyUAClient
   
   ' Read node value and display it
   Range("A1").Value =   
       Client.ReadValue("http://localhost:51211/UA/SampleServer", 
       "nsu=http://test.org/UA/Data/;i=10853")

As you can guess from the code, the event handler reads a value of an OPC-UA node and stores it into cell A1 of the worksheet.

Step 5. Save the file as "Excel Macro-Enabled Worksheet", close Excel, and then open the file again. The worksheet will read the OPC item and put it into cell A1, so you will see something like this:

Howtoreadanopcuanodevalueinexcel-4.png



This concept can obviously be enhanced in many different ways. Specifically, you may want to tie the OPC actions to different events, such as pressing a button on the sheet, or a periodic timer. This example project is included with the product. Please use the example from the product itself for the most up-to-date code of the example.

See Also

How to read an OPC item value in Excel (OPC Data Access)