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twu11-Visitor
1-Visitor
January 9, 2017
Question

OPCDA limitation

  • January 9, 2017
  • 5 replies
  • 2664 views

I want to know, is there any limitation for OPCDA Service?

On one OPCDA service, somehow I added tags less then 100 to communicate to my OPC server, it's all OK and I can retrieve all data, but when I added tags more then 150, some tags couldn't retrieve data and some tags could.

By the way, if I want to connect more then 5000 tags, what solution to suggest?

    5 replies

    jamesm15-Regular Member
    5-Regular Member
    January 9, 2017

    Are you using the OPC UA Client extension? Is your OPC DA Server Kepware, or another OPC DA server?

    Are the property updates not coming through even if you tie them to a mashup? It's possible that there may just be too many properties for the Composer to handle. See: https://support.ptc.com/appserver/cs/view/solution.jsp?n=CS203736&lang=en&source=snippet

    CarlesColl1-Visitor
    1-Visitor
    January 9, 2017

    I have over 400 properties on TW OPC-DA Extension no issues, but you may need to fine tune OPC-DA Configuration JSON Settings (OpcDaThing.config) on the edge, you should look at ConnectionSettings section and increase MaxMessageSize for instance.

      jamesm15-Regular Member
      5-Regular Member
      January 9, 2017

      Hey Carles,

      Do you have a good rule of thumb for a max message size? I believe the only real constraint here is the sending servers memory, so if the default is 8192 (which is what the Edge SDK it is based on defaults to) perhaps something more like 128000 is more appropriate for a OPCDA server?

      CarlesColl1-Visitor
      1-Visitor
      January 9, 2017

      On my case for about 400 properties I have 256000, but you should do some testing.

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