OPC Server does not update data value

Hello,
I have a problem with a program that uses an OPC server to comunicate with a PLC.
It happens randomly, when I update the data, i cannot see any patern, sometimes it happens quickly, sometimes it takes longer...
The data socket is declared like that:
hr = DS_OpenEx ("psp://localhost/Server/Automate.405466", DSConst_WriteAutoUpdate, NULL, NULL, DSConst_EventModel, TIMEOUT_OPC_mSEC, &ecr_MW5465);
And is update like this:
hr = DS_SetDataValue(ecr_MW5465, CAVT_SHORT, l_buf, 1, 0);
The function does not return any error, but the value is not updated server side.
Lookout version is 6.6, the program is made with CVI 8.5.1 and communication is in ethernet modbus. I do not know if further details could be useful.
Thank you.

Fred,
Can you read the value being updated directly from the OPC server? Usually you can just view the values and see if they are updating.
The next thing to check would be to use the shared variable monitor to see if the variables that are bound to the OPC server are updating. It is under Tools >> Shared Variable >> Variable Manager.
Also, when you have the program running, do you get any type of error from reading the shared variable? If you are seeing an error, it would give us a little more insight into what is going on.
Brian Coalson
Software Engineer
National Instruments

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