From: W.
Sent: Monday, January 24, 2011 6:45 PM
To: Zbynek Zahradnik
Subject: RE: Disconnecting from and OPC Server

Hello Zbynek,

Thanks. This makes sense. I just wanted to make sure I wasn’t missing something. I can handle this one from here. Thanks again for the direction.

W.

W.,

To me, this looks more like something in the server – after all, if I understand it well, it goes into a weird state and refuses new connections? Can this be verified with other OPC client (not just customer’s application) at that time?
The code provided looks correct. The second part (the Dispose-s and GC.Collect-s) should not even be necessary.

Regards,
Zbynek Zahradnik

From: W.
Sent: Monday, January 24, 2011 1:56 PM
To: Zbynek Zahradnik
Subject: Disconnecting from and OPC Server

Hello Zbynek,

.... I have another question. The customer claims his Data.NET is not disconnecting from the OPC Server. I had his set the hold periods to very low. Is there anything else I am missing?


With VB.Net 2005 and OPC Data.Net 5.4.35.1, the
TcOpcSvr.exe process keeps running sometimes . When it does and I try to restart my app it fails communicating to the OPC Server, as it is still running as a "ghost". When I close the OPC Server window it says clients are still connected. Which is not true since my application is closed (it no longer appears in Task Manager either).
EasyDA.HoldPeriods.ServerDetach = 1
EasyDA.HoldPeriods.ItemDetach = 1
EasyDA.UnsubscribeAllItems()
RemoveHandler EasyDA.ItemChanged, AddressOf SubscriptionHandler

EasyDA.Dispose()
GC.Collect()
Me.Dispose()
GC.Collect()
End

Thanks,

W.