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PCO Connection to KepWare Session Closes

Hi Experts,

I have KepServerEX v.5 and PCO 2.3, both on same server.  I can connect successfully and read an OPC tag into MII via PCO. 

HOWEVER:  I am experiencing the following behavior:

  • The first request for a tag fails after ~15 seconds.  Error message is meaningless.
  • Subsequent requests (of any tag) succeed … until I stop making requests for 60 seconds, then they succeed again after the initial time-out.
  • ODD PART:  If I open an OPC Test Client on on the OPC / PCO server and configure a tag (and don’t even poll it) then my issue above disappear

I see a KepWare configuration setting set to close connections/sessions if no activity for 60 seconds.  (I can change the duration but not disable it.)

What I expect is happening is that the first PCO request creates the session (this takes a several seconds, even with the OPC Test Client).  Subsequent PCO requests within 60 seconds use the same connection/session.

What I seek is that the PCO agent starts, it opens the session and keeps it open, like the OPC Test Client does.  I don't see any obvious settings in PCO to configure it this way.  Any advice or direction?



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