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 COM
  7. Reading, Writing, Subscriptions
  9. Internal EasyOpcUA error on large amount of monitored items

Internal EasyOpcUA error on large amount of monitored items

More
15 May 2024 13:47 #12789 by ToSi
Replied by ToSi on topic Internal EasyOpcUA error on large amount of monitored items
Hi,

updating the software solved the issue. Thank you very much.

Best Regards
Tom

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

More
13 May 2024 15:50 #12782 by support
Replied by support on topic Internal EasyOpcUA error on large amount of monitored items
Hello.

This looks like a problem on the client (QuickOPC) side. However, it is in an old version than we no longer officially support - and make no fixes for.
The recommendation is to test with the recent QuickOPC version. We will investigate if the same issue appears.

Best regards

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

More
13 May 2024 14:04 #12781 by ToSi
Internal EasyOpcUA error on large amount of monitored items was created by ToSi
Hi,

we just increased the amount of subscribed signals within our OPC-Client. Now most, but not all items don't receive data change events. The Subscription event listener does not notify us about any exceptions but the Windows event viewer does:
Internal error (only first occurrence is logged): An exception of type "System.NullReferenceException" from source "OpcLabs.EasyOpcUA" has occurred in OPC-UA guarded operation 'ConnectSubscriptions'. The exception descend follows.
(0) System.NullReferenceException OpcLabs.EasyOpcUA (AddMonitoredItemsToSdkSubscription) -> Object reference not set to an instance of an object.

I am not able to make it work, even when decreasing the amount of signals again, which is very strange. We talk about 1000 signals with this client. Could it also be a server-side problem?

SImilar topic: NullReferenceException on Large Subscriptions

OPC-Server: Siemens PCS7
QuickOPC-Version: 5.60.224.1

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

Moderators: support
  1. Forum
  3. Discussions
  5. QuickOPC-UA in COM
  7. Reading, Writing, Subscriptions
  9. Internal EasyOpcUA error on large amount of monitored items
Time to create page: 0.070 seconds