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Edge HMI

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Points

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  • Last UpdatedOct 29, 2026
  • 3 minute read

The Points dialog is used to configure the data points for a Trend Control screen object. The value of each data point is represented as a pen in the trend display. You can dynamically change which data points are visible during run time, regardless of how many data points are associated with the screen object.

Access the dialog

To access the Points dialog for a specific Trend Control screen object, first access the Object Properties dialog for that screen object and then click Points.

The dialog in detail

Points dialog

The following table summarizes the properties of each data point:

Column Name

Description

Point

A unique ID number for the point, which is assigned automatically when the point is created in this interface.

Label

The label associated with the Point can be displayed on the Legend, during run time, providing a short reference to the user for each Point. This field accepts String expressions.

Color

The color of the pen usedColor of the pen used to draw the values of the Point on the Trend Control object.

Data Source

The data source for this point. Tag is available by default, but all other sources must be configured in the Data Sources dialog. Note that custom properties are supported.

Tag/Field

The meaning of this parameter depends on the Data Source type associated with the data point:

  • If Data Source is Tag, type the name of the tag with values to be displayed. If the tag is configured in a Trend task worksheet, its history will be automatically retrieved and displayed. Otherwise, only the tag's online values โ€” that is, the tag's actual values during run time โ€” will be displayed. (Please note this means that the tag's trend line cannot be redrawn after zooming; only new values can be drawn as they are received. For more information about zooming, see About the trend control runtime interface.)

  • If Data Source is Batch, type the name of the tag with values to be retrieved from the Batch History file that is generated by the Trend task worksheet.

  • If Data Source is Database, type the name of the field (column) in the SQL Relational Database that contains the point's values. For more information, see Using the Data Source Database.

  • If Data Source is Text File, type the number of the column in the text file that contains the point's values. The number 0 refers to the first column, 1 refers to the second column, and so on. For more information, see Using the Data Source Text File.

Note that custom properties are supported, including array tags.

Min Scale / Max Scale

The scale of the Y-axis for this point. This overrides the default scale that is set in the Axes dialog.

Note: The Min Scale and Max Scale properties can hold real numeric values up to six decimal places. If you need more precision than that, you must configure the Min Scale and Max Scale properties with Real tags and then store the values in those tags.

Style

The line and marker styles for this point; click the Browse button icon button to open the Pen Style dialog.

Options

Additional options for this point; click the Browse button icon button to open the Options dialog.

SPC

Calculated statistics to be used in statistical process control (SPC); click the Browse button icon button to open the SPC dialog.

Hide

Tag trigger โ€” when the value is TRUE, the data point is hidden in the trend display.

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