I’ve been trying to tweak scan classes to prevent comms issues and getting a bit confused as to the effects they have.
Can i get a bit of breakdown as to best practise.
If i have an analog tag reading a motor current, and its scan class is set to the following:
Slow Rate: 10,000ms
Fast Rate: 2,000ms
And i want to record history for the values with the following historical scan class:
Slow Rate: 1,000ms
Because the scan class is slower than the historical scan class, I’d be missing out on real time data right? If the tag is using the fast rate, my true value of the tag gets updated every 2 seconds, and i’ve recorded two historic values of the same value.
If my tag is using the slow rate, then the true value only updates every 10 seconds, and i’ve recorded 10 values in my historical table with the same value.
Is that correct? Or does the execution of a historical tag read the value from the OPC when its run?