Realtime Power Chart Historian Needed?

For the power chart, do you have to have history configured on the chart? Or can it plot from the point in time you loaded the screen/view?

So if you specifiy the last 10 seconds, it will start overriding itself after 10 seconds worth data.

You must have the historian. Ignition doesn’t have any builtin ability to do a ‘local’ value trend. There are some third-party modules/efforts to do so in Vision, I believe, but I don’t think anyone’s done so in Perspective (yet?).

My recorder() expression function (from Simulation Aids–free!) should work in Perspective.