I had some basic questions about what versions and features of OPC DA that Vision supports. I apologize for incorrect or vague descriptions but I’m not a programmer and not an OPC expert.
- What version if the OPC DA Standard does Vision support?
- OPC DA 3.0 Buffering - For discussion purposes lets say that we have an OPC tag that is changing every two seconds and Vision is setup to query the the OPC Server every 5 seconds for new data. In our current configuration, Vision only gets the current value of the tag and doesn’t appear to support OPC buffering. I though the latest OPC DA version supported OPC buffering and would supply OPC Clients with buffered data (replay the events to the OPC Client that occured between OPC Client poles).
- OPC Timestamps - Is it possible to allow Vision to use OPC Timestamps supplied by the OPC Server?
The reason I ask about these topics is we are using the protocol DNP which is used heavily in the Power industry where event timestamps to the millisecond are important for determining Sequence Of Events (SOE). Kepware supports these features but we are not able to utilize these features in Vision.
Hopefully my examples are clear and not too confusing. I would appreciate any advice on these topics.