XY plot
- Last UpdatedDec 19, 2024
- 2 minute read
Use an XY plot (also called a scatter plot) to correlate one or more X-axis data sources with one or more Y-axis data sources. On an XY plot, each axis shows possible values from their respective data sources. The plot matches recorded values from the X-axis data source with recorded values from the Y-axis data source and marks each matched pair with a data point. For example, the following image shows a basic XY plot.
The example shows 10-minute intervals of two data items, A and B, for the last hour. Item A had 12 recorded values; item B had 16 recorded values. The number of plotted data points equals the number of pairs. Since A had fewer recorded values, the plot shows only 12 data points. AVEVA PI Vision ignores the extra recorded values from point B. You can configure the method to pair values.
Correlation measures the strength of the relationship between two variables. The plot indicates correlation by the spread of the data points around a fitted straight line (for example, a straight line that indicates the trend of the data). In general, the closer the points are to the fitted line, the stronger the correlation. The following plot shows perfectly correlated data.
AVEVA PI Vision provides the following XY plot capabilities:
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Capability |
Operational Requirement |
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Plot one or more process variables against an independent process variable for a specified period. |
Identify correlations and anomalies in the process. |
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Plot multiple series with unique X-axis components. |
Compare operations over multiple assets and time ranges. |
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Plot a theoretical reference curve alongside process data. Follow the steps in the article KB01580 - Plot a reference curve on an XY Plot. |
Compare the performance of assets to an ideal benchmark operation. |
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Plot a current operating (single) point on a static curve. |
Evaluate the current state of your process. |
Default configuration
Administrators can set the default configuration for XY plot symbols across all displays. For more information about display defaults, see the Default display and symbol configuration topic in the AVEVA PI Vision Installation and Administration Guide. The symbol configuration settings which a default can be set for are:
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Scales
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Multiple Y Scales
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Color
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Font
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Name
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Size
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General
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Background Color
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Title
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Position
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Color
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The text of the title cannot be set as a default
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Legend
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Position
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Color
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Grid Lines
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Color
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Engineering Units
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X-Axis Label
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Only the visibility toggle can be set as a default
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Y-Axis Label
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Only the visibility toggle can be set as a default
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