I am looking to use either the OPC DA or OPC HDA to collect continuous data and the RDBMS or OPC A & E interface for the Alarm and Events?
Can anyone recommend which way is the more reliable?
We use both OPC DA and OPC HDA to collect data from different ABB 800xA-systems. There were some issues with extremely slow startup times for the PI OPC HDA-interfaces (on several sites), but the issue was solved after ABB provided a patch for their system, so now we run both setups without any problems.
In addition we use RDBMS to collect A&E data.
OSIsoft's official response is to use PI OPC DA Interface or PI OPC HDA Interface when you're looking to bring data from ABB 800xa.
Retrieving data ...