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  1. Forum
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  5. QuickOPC-Classic in .NET
  7. Reading, Writing, Subscriptions, Property Access
  9. Subscribe Problem

Subscribe Problem

  • Peter Siegel
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24 May 2011 15:20 #383 by Peter Siegel
Replied by Peter Siegel on topic Re: Subscribe ProblemI
Hi!
I tried using SubscribeMultipleItems, but it is the same. It works best if i increase the delay, but it becomes unbearable now ~ 30 minutes is way too much for 5000 Items.
I also noticed that sometimes the Subscribe Command itself seems to hang for a while. But eventually it recovers / or aborts and continues.
Is there a way to check if the Subscribeitem method completed successfully?
thanks
Peter

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24 May 2011 07:37 #381 by support
Replied by support on topic Re: Subscribe ProblemI
Hello. Right now I cannot tell where the problem is. I will set up something similar here, with Simulation OPC Server, and let you know.
As general note, with larger number of items, it is suggested that SubscribeMultipleItems is used in place of multiple SubscribeItem calls.

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  • Peter Siegel
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23 May 2011 14:39 #376 by Peter Siegel
Replied by Peter Siegel on topic Re: Subscribe ProblemI
I'm still testing but it seems to work when i use a delay of 100ms after each subscribeItem Command.
I'll need to get it to work without the delay, and i'm not sure if 100 ms is enough if i try this on a slower machine.
Peter

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  • Peter Siegel
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23 May 2011 14:31 #375 by Peter Siegel
Subscribe Problem was created by Peter Siegel
Hi!
When I register for approx. 1000 Items, i recieve an initial update for each Item immediately after the subscription. (And updates when the value is changed of course).
But when i'm registering for approx. 5000 Items on an Simatic net opc server. i only get initial updates from some of them.
Is there some kind of queue which runs full?
I already tried raising the LinkCallbackQueueSize to 10000 the DefaultEventqueueSize and the TopicLruSizes...
thanks Peter

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Moderators: support
  1. Forum
  3. Discussions
  5. QuickOPC-Classic in .NET
  7. Reading, Writing, Subscriptions, Property Access
  9. Subscribe Problem
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