Hello,
I don't know how exactly it's called.
So I have Indusoft Viewer, and there all numbers, real time values, update every 20 seconds. It's really long time.
On trends everything like I set. Some critical tags update every 200ms, some every 1 sec, some every 10 sec.
Problem with numbers on screens. Example, I have modulated valve which operate very quick, for 20 seconds he may open to 100% and close back to 0%, but with refresh every 20 seconds, this valve looks like all the time closed. On trends I can see how valve open and close.