I am working on implementing the EMDVB interface, and while I have seen it before, I guess I never really knew the full extent of the options available for connectivity.
I am leaning towards using SQL connectivity for both DV Batch and DV Alarm & Event Chronicle data source interface, but I wanted to get some pros and cons or testimonies for this and the other available connectivity options.
Let's start by ruling out .EVT connectivity to the batch historian (though I recently saw this deployed at a rather new installation, so maybe I'm missing something). The interface document basically states Emerson doesn't support access to the EVTs, anyway.
The OPC A&E connectivity for batch history (which I'll admit I was not aware of) is intriguing, but seems that it requires the SQL connection as a fallback, so maybe why bother unless we need batch events in real time. However, if I want to have Alarms recorded in real time, that would be the way to go.
Regarding Alarms and events, I recently saw connection to the chronicle through RDBMS implemented, but it seemed like a lot configuration was required, which I suspect is already handled in EMDVB, so I'm pretty much ruling that out as well.
Thanks for any input and insights you can provide.