OPC Server DA dll - Retrieve tags value in bulk|Classic OPC: DA, A&E, HDA, XML-DA, etc.|Forum|OPC Foundation

Hi,

I'm using OPCSiemensDAAutomation dll with C# .NET to retrieve tag's value from OPC Server. I managed to retrieve the values using QueryAvailableProperties() and GetItemProperties(), but the objective is to retrieve 500k tags value per request.

I have tested with 100 tags and the code finished it in 45 seconds, with multi threading resulted in a small improvement of 30 seconds for 100 tags. It'll requires more than 4 hours to achieve the targeted tags volume with current speed. Is there any way that I can retrieve the tags value in bulk with better performance? Thanks.