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. connection to kepwareserver

connection to kepwareserver

More
09 May 2018 18:12 #6322 by support
Replied by support on topic Can't create a simple read on a single tag
There were two differences originally:
- The NodeId in your code was missing two pairs of doublequotes, and
- The NodeId in your code had an additional V_ at the beginning of the string identifier.

In your latest image, you have properly corrected the missing double quotes, but you still have the V_ in front of string identifier that is not present in the screenshot you provided from the other OPC UA client. You need to remove the V_ part.

Regards

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

More
09 May 2018 11:45 - 09 May 2018 11:45 #6320 by support
Replied by support on topic Can't create a simple read on a single tag
Yes.

And, I can see you use different NodeIDs in your code versus the screenshot from "OPC UA Client".

In your code, you have:
ns=3;s=V_FB_Holo_DB.IntCounter

In OPC UA Client, you use:
ns=3;s="FB_Holo_DB"."IntCounter"

You need to use the same NodeID in both tests, in order to be able to make a comparison that has relevance.

Best regards
Last edit: 09 May 2018 11:45 by support.

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

More
09 May 2018 08:18 #6318 by support
Replied by support on topic Can't create a simple read on a single tag
Kepware OPC Quick Client uses OPC Classic to make the connection. Your code is using OPC UA. There is absolutely no conclusion you can draw for OPC UA from the fact that some tag can be read through OPC Classic.

You need to test with some other client that uses OPC UA.

Best regards

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

More
08 May 2018 16:01 #6316 by support
Replied by support on topic Can't create a simple read on a single tag
Most likely the server is sending the data in this way - with no value. So the issue needs to be resolved at the server (or, you are looking at wrong data).

Have you tried some other OPC client to check the same data? This way you could determine whether there is something specific to QuickOPC behavior ot not.

Best regards

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

More
04 May 2018 10:43 #6301 by support
Can't create a simple read on a single tag was created by support
Hello,

what error message are you getting?

Check the server address. Are you sure it is on port 4840? KepServer has "OPC UA Configuration" manager which shows the URLS of the enabled endpoints .

Best regards

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. connection to kepwareserver
Time to create page: 0.049 seconds