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  9. Internal EasyOpcUA error on large amount of monitored items

Internal EasyOpcUA error on large amount of monitored items

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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

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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

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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

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  1. Forum
  3. Discussions
  5. QuickOPC-UA in COM
  7. Reading, Writing, Subscriptions
  9. Internal EasyOpcUA error on large amount of monitored items
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