Period Comparison Chart+ for AVEVA PI Vision
See whether this shift, day, month or year is behaving like the ones before it. Period Comparison Chart+ lays the periods over each other on one aligned axis in your PI Vision display.
Each layer is one period folded onto the same axis, so 10:00 today lines up with 10:00 yesterday and March this year with March last year.
Generate the comparison periods from a rule, so the chart keeps comparing the right periods as the display time moves on.
Put today next to the same day in the previous weeks and see at a glance whether it runs higher, lower or with a different shape.
Compare against a period that no rule describes, such as a known good run, last month’s startup or the days before a process change.
When the question is how far a period is from its reference, show the difference itself instead of asking readers to estimate it.
Turn the comparison layers into their difference from a reference period, in engineering units or in per cent.
Keep both original curves and fill the area between a layer and its baseline, so larger deviations stand out.
Read exact values per layer, keep a reference period on screen and take the comparison into a report or spreadsheet.
The table below the chart gives exact numbers for every layer and works as the control surface for dense comparisons.
Zoom into a small difference, open the chart full screen in a review meeting, or export the aligned data.
Four common ways teams use Period Comparison Chart+ on their displays.
Questions we are asked most often. Read the Period Comparison Chart+ documentation or ask a technical question.
A trend shows values over clock time. Period Comparison Chart+ lays several periods over each other on one aligned axis, so equivalent positions line up, for example three hours into a shift or ten days into a month. Use a trend to see what happened, and this symbol to see how one period compares with others.
Dynamic layers repeat the display time window or snap to calendar days, weeks, months or years, with a count, a direction and a shift by period or calendar unit. Manual layers use an offset or a custom start and end time. You can also pin any period from the summary table.
Yes. Use calendar layers of one year with Summary data retrieval at a one-month interval, choose a summary type such as total, average or maximum, and show the series as bars or lines.
No. Every period is folded onto one aligned axis, so a zoom only changes what the chart shows. The display time and the other symbols on the display stay as they are.
PI Vision 2021 or later with PI Web API, and PI AF Server 2018 SP2 or later. Period Comparison Chart+ runs in PI Vision and uses each user’s existing PI permissions.
Period Comparison Chart+ is part of Vision Library+, together with the other Vision Library+ symbols. Request a trial to test it in your own PI Vision environment.
Period Comparison Chart+ is included in Vision Library+, the PI Vision custom symbol library from Software Athlete. Test it on your own displays and data.
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