Implement a graph displaying 2 plots on live Time


I would like to make a graph displaying 2 plots.

Plot (a) reads an incrementing integer on y-axis vs time on x-axis

Plot (b) shows the difference of the previous value that has occurred between lets say every 15 min of an hr

I want the x-axis showing the live time in “HH:mm” format constantly updating every hr as I would like to separate the x-axis in lets say 4 slots (every 15 min).

finally is there a way to store those graphs somewhere?

How are you storing the values? Tag History? From a database?

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I am reading values from the PLC so the tag is stored in Tag History indeed.