Points dialog

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 runtime, regardless of how many data points are associated with the screen object.

The dialog in detail

Figure 1. 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 runtime, providing a short reference to the user for each Point.
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.
Tag/Field	The meaning of this parameter depends on the Data Source type associated with the data point: Tag: Type the name of the tag with values to display. If the tag is configured in the Trend task, the history data is automatically retrieved; otherwise, only the online values are displayed. Batch: Type the name of the tag with values to be retrieved from the Batch History file generated by the Trend Task, and displayed on the object. Database: Type the name of the field (column) in the SQL Relational Database that holds the data Point values. Text File: Type the number of the column that holds the Point values. The number 0 refers to the first column, 1 refers to the second column, and so on.
Min / Max	The scale of the Y-axis for this point. This overrides the default scale that is set in the Axes dialog. Note: The Min and Max properties can hold real numeric values up to six decimal places. If you need more precision than that, then you must configure the Min and Max properties with Real tags and then store the values in those tags.
Style	The line and marker styles for this point; click the button to open the Pen Style dialog.
Options	Additional options for this point; click the button to open the Options dialog.
Hide	Tag trigger — when the value is TRUE, the data point is hidden in the trend display.