Hello, I have a question about OPC Server functionality related to pulling PI Data.
We recently commissioned a Honeywell Experion system and are pulling around 3k tags. These tags are spread across 4 controllers. During the commissioning of the DCS I configured the PI tags to use Advised mode but quickly found out I was overloading the refresh rate on the controllers and impacting the operator stations.
The OPC Servers and the PI OPC Interfaces are configured to 'read from cache' but it seems that advise mode will trigger the OPC Server to refresh it's cache from the controller on every request (which is 1 second for advise). As a result I am forced to limit the poll rate to 30 seconds.
Experion is a common DCS so I was wondering if anyone had any advice or comments about the OPC Server configuration or PI Interface configuration?