Use the Advanced dialog box to configure advanced settings for a Trend Control object.

Accessing the dialog box

To access the Advanced dialog box for a Trend Control object, first access the object properties for that object and then click Advanced. For more information, see Trend Control object.

The dialog box in detail

Figure 1. Advanced dialog box
Web Studio Help dialog objectproperties trendcontrol advanced Advanced

The Advanced dialog box includes the following settings:
Group Setting Description
Run Mode Options Update trigger When the tag configured in this field changes value, the trend object is updated (refreshed).
Update interval When the update trigger is issued and the X Axis if of type numeric, the value on this field will be added to the minimum and maximum values of the X Axis.
Load indicator Type the name of a project tag. While the trend control is loading external data, the tag receives a value of 1, and when the trend control has finished loading the data, the tag receives a value of 0.
Move to current time on run When this box is checked, X axis shifts to the current time automatically when the object is triggered to Play mode, during runtime.
Retrieve bounding samples When this box is checked, the object retrieve the data outbound the object (first points only). Uncheck this option can improve the performance, since the points outbound the object will not be retrieved from the history. On the other hand, the object will not draw lines linking the first and last samples to the extremities of the object.
Run-Time Config Save trigger The settings of the Trend object modified during runtime can be saved in temporary files. This option can be used to:
  • Keep the settings consistent, so when the user closes the screen and opens it again, or re-starts your project, the settings configured during runtime are not lost.
  • Create standard settings for different scenarios and load the appropriate configuration during the runtime, based on a pre-defined condition or based on the user-selection.

When the tag configured in this field changes value (e.g., toggles), the current settings of the Trend object are saved in the temporary file. This command is not available for the Thin Client.

The following settings are saved:
  • Points: Color, Tag/Field (in case you are using indirect tags), Min Scale, Max Scale, Hide
  • Axes: Period (start time, end time, etc.), Grid Divisions, Number of Labels, Enable Cursor, and the current zoom
  • Toolbar: Show/hide state of all commands that do not have activation tags configured
  • Legend: Visible columns with widths, Maximum Size, Number of Items, Selected Item
Load trigger When the tag configured in this field changes value (e.g., toggles), the settings from the temporary file are loaded and applied to the Trend object during runtime.
Note: After the screen where the Trend object is configured is saved, the settings are not automatically loaded from the temporary file when the screen is opened again, unless the Load trigger command is executed before the screen is closed.
File Name If this field is left blank, the temporary file is saved in your project’s Web sub-folder with the syntax ScreenNameObjectIDTrendControl.stmp (e.g., MyScreen10TrendControl.stmp). The Thin Client station saves/loads the temporary file in the standard Temp directory of the operating system (e.g., Documents and SettingsCurrentUserLocal SettingsTemp).

You can configure a customized file name for the temporary file in this field or even configure a string tag between curly brackets, so the user can change the name of the configuration file dynamically during runtime by changing the value of this tag. If you do not specify any path, the file is saved in your project’s Web sub-folder by default.

Auto Save When this box is checked, the current settings of the Trend are automatically saved in the temporary file when the screen where the Trend is configured is closed during runtime. If the box is not checked, the settings are saved only when the Save trigger command is executed.
Custom Point Selection Screen This interface allows you to create your custom dialog to modify or insert pens to the object.

Name of the screen which must be launched when the user triggers a command to modify or insert a new pen to the object during runtime.

Point Number Point number (from the Points dialog), indicating the point associated to the pen that will be inserted or modified during runtime.
Add Indicator Flag that indicates that the user triggered an action to insert a new pen (value 1) instead of modifying a pen that is already been visualized (value 0).
Export to File Trigger When the tag configured in this field changes value (e.g., toggles), the current state of the trend control is exported to an image file. The toolbar and scroll bar are not included. The legend and time display are included only if the trend control is configured to show them.
File Name The file path and name of the exported file.

If no path is specified, then the file is saved in the project directory. If no extension is specified, then it is determined by Format.

Tip: You can specify a project tag in curly brackets (e.g., {tagname}), to programatically change the file name during runtime.
Status The tag configured in this field receives status codes that indicate the success or failure of the export.
Format The graphic format of the exported file.

If Auto is selected, then the format is determined by the extension specified in File Name. If Auto is selected but no extension is specified, then the default format is BMP.

Size The image file is exported at full size by default. However, you can specify the width and height (in pixels).
Decimation Enable When this option is selected, the trends in the Trend Control object that are configured to show historical data will have their data decimated before the trends are drawn. This means that for each trend, the X axis is divided into a number of intervals (determined by Max Points) and all of the data points within each interval are averaged together to be drawn as a single point. This can improve runtime performance when there is a large amount of historical data to display, and it can make the trends easier to read.

Decimation only works when the trend control is in Stop Mode (a.k.a. Historical Mode).

Please note that when this option selected, decimation is done for all trends that are configured to show historical data. To do it for only for a single trend, use Draw Mode in the Points – Options settings.

Note: If decimation is enabled and the X axis is set to be numeric rather than date/time, then the data used in the X axis must be properly sorted. For more information, see the Data Sources settings.
Note: If the data sources for one or more points are tags from a Trend worksheet that has been configured to save to a Wonderware Historian database, decimation must be enabled at least for those points.
Max Points The maximum number of data points used to draw each trend. Default is 2048.
Options VK (Virtual Keyboard) Virtual Keyboard type used for this object.
Ignore X Filter When this box is checked, the X Filter is ignored to avoid adding the WHERE or querying clause to the Data Sources.
Enable translation Enable the external translation for the text displayed by this object.
Auto Format When checked, decimal values in the Current, Cursor, Max, Min and Scale columns will be formatted according to the virtual table created by the function SetDecimalPoints.
Note: For the Auto Format to work, decimals formatting on the X axis must be disabled — that is, the Decimals box in the Axes settings must be left empty.