Professional OPC
Development Tools

logos

lupa

Online Forums

Technical support is provided through Support Forums below. Anybody can view them; you need to Register/Login to our site (see links in upper right corner) in order to Post questions. You do not have to be a licensed user of our product.

Please read Rules for forum posts before reporting your issue or asking a question. OPC Labs team is actively monitoring the forums, and replies as soon as possible. Various technical information can also be found in our Knowledge Base. For your convenience, we have also assembled a Frequently Asked Questions page.

Do not use the Contact page for technical issues.

  1. Forum
  3. Discussions
  5. QuickOPC-UA in .NET
  7. Connections, Reconnections, Certificates
  9. Quality Assurance Data

Quality Assurance Data

More
12 Apr 2022 08:51 - 12 Apr 2022 08:52 #10803 by support
Replied by support on topic Quality Assurance Data
Hello,

OPC "Classic" had a concept called Quality.
OPC UA does not have that. I suppose that when you refer to quality, you actually mean StatusCode: reference.opcfoundation.org/v105/Core/docs/Part4/7.39.1/ .

The StatusCode is usually passed as part of DataValue, i.e. the actual value together with its timestamps, and the status: reference.opcfoundation.org/Core/docs/Part4/7.11.1/ .

QuickOPC tries not to interfere wit anything inside the DataValue, including the StatusCode. That is, if you read a variable or subscribe to it, the server sends a DataValue, and we just convert it appropriately and deliver to you, but do not change the StatusCode.

OPC UA has guarantees so that whatever gets transferred between the UA server and UA client is not damaged. The StatusCode therefore does not refer to anything that has to do with OPC UA communication. It is determined on the server side (or the PLC).

Given that QuickOPC does not change the StatusCode either intentionally or unintentionally, questions about it should be addressed to whomever that generates the StatusCode - which is the server side.

Best regards
Last edit: 12 Apr 2022 08:52 by support.

Please Log in or Create an account to join the conversation.

More
11 Apr 2022 10:22 #10801 by neilcooley
Quality Assurance Data was created by neilcooley
Hi
We have been using OPC UA for general data logging but now we are looking at logging more sensitive data and have a few questions.

With regards to OPC UA and the SDK, if the quality is GOOD does this mean that the SDK knows that there has been no corruption in the data value from the PLC?


Thanks

Neil

Please Log in or Create an account to join the conversation.

Moderators: support
  1. Forum
  3. Discussions
  5. QuickOPC-UA in .NET
  7. Connections, Reconnections, Certificates
  9. Quality Assurance Data
Time to create page: 0.050 seconds