Solution:

Please refer to the attached file for further detail information. The field "Primary Rate" (on the middle-right of the window) is the point (the unit is second). The default value is 1, that means 1 second. However, If you change this value to 0, then the OPC server will polling the ADAM devices with the highest speed. By the way, user's OPC client program also need to adjust the polling time to get the swiftly response. However, our OPC client demonstrate program AOC.EXE was fixed on 1 second.