How to Read Data With OPC UA

OPC UA Client connection to OPC UA Server:

• Select “Modules” category from menu.
• Select “Driver” to connect OPC UA Server.

• In “Drivers” page, click plus '+' button to add new driver.

• Name: Write any name you like to describe connection, for example OPC_UA
• Endpoint: This is the endpoint URL of OPC UA Server
• Type: Choose OPC UA for connection type.
• Driver Specific Options: After choosing OPC UA type for connection, set username and password. If Server accept anonymous connections delete username and password in curly braces

• Then click “Save” button to establish connection.

• To see connection established, select “Status” category from menu then click “Driver” option.
• Driver name, last message and status are shown in this page, if connection is completed, green connected bar will be shown.

• After connection established, tag must be added to driver. To do that:
  • Select “Modules” from menu, then click “Tag” option.
  • In “Tags” page, click plus “+“ button to add new tag.

• “Details” page will be shown after clicked ”+” button.
• In this page:
  • Name: Choose any name you like to describe tag.
  • Type: Choose proper type for data.
  • Address: Write tag address, this address is coming from OPC UA Server.
  • Address Prefix: You can write address prefix.
  • Conversion Script: In this area, you can do math operations with tag.
  • Driver Name: Choose correct Driver for Driver Name. In this example, OPC_UA

• Click “Save” button to add tag.

• After adding tag, to see connection established and coming data, select “Status” category from menu then click “Tag” option.
• In this page: Name, Last Value, Last Message, Last Update Time and Status will be shown
• If tag is added to driver successfully, green OK message will be appear under Status.
• Last Value: Last data will be shown coming from connection.

TROUBLESHOOTING:

• If connection is not completed successfully, follow these steps to test connection:
  • Go to https://opcfoundation.org/products/view/opc-ua-client-free-product
  • Then click “Product website”.
  • After registration, click download button.
  • Open downloaded file and setup app, after finished setup, open OPC UA Client app.

• There is connection button to connect OPC UA Server, click this button

• Write Endpoint URL and fill other necessary fields.

• Click “Apply” button and confirm connection
• If connection is successful, connection message will appear.