About the trend control runtime interface

Run

Sets the trend control to Run Mode (also known as Online Mode). In this mode, the X-axis continues to scroll with the passage of time and the trends are updated with current tag values.

0 = stop trend

1 = run trend

The Activation Tag is only one for both Run and Stop commands and it is configured on the "Run/Stop" field

Stop

Sets the trend control to Stop Mode (also known as Historical Mode). In this mode, the X-axis is stopped and the trends display only historical data.

If decimation is enabled for one or more trends, the calculation and redrawing is done only in this mode.

0 = stop trend

1 = run trend

The Activation Tag is only one for both Run and Stop commands and it is configured on the "Run/Stop" field

Period

Opens a dialog which can be used to modify the X-axis scale main settings.

1 = open dialog

Resets to 0 after open.

Window Zoom

Allows the user to click on the trend graph and drag the cursor to select the area that must be visible when the cursor is released.

This option is disabled when the Multiple Section option (for the Y scale) is active.

0 = disable zoom

1 = enable zoom

Resets to 0 after user input.

Horizontal Zoom

Allows the user to click on two points in the trend graph, defining the horizontal scale that must be available.

Vertical Zoom

Allows the user to click on two points in the trend graph, defining the vertical scale that must be available.

This option is disabled when the Multiple Section option (for the Y scale) is active.

Zoom In

Zooms in (that is, halves the current X and Y scales) each time the user clicks the tool.

1 = execute command

Resets to 0 after execution.

Zoom Out

Zooms in (that is, doubles the current X and Y scales) each time the user clicks the tool.

Cancel Zoom

Cancels the current zoom and returns the trend graph to its original scale.

Legend Properties

Opens a dialog which can be used to modify the Legend main settings.

Pen Style

Opens a dialog which can be used to modify the pen style of the selected trend.

Add Pen

Opens a dialog which can be used to add a new trend to the trend control.

Remove Pen

Removes the selected trend from the trend control.

Multiple Sections

Switches the Y scale between Multiple Sections (a section for each trend) and Single Section (all trend share the same Y scale section).

0 = Single Section

1 = Multiple Sections

Cursor

Switches the cursor (ruler) between visible and hidden.

0 = Cursor hidden

1 = Cursor visible

Auto Scale

Changes the Y axis scale to fit all values from the trends that are currently being monitored.

1 = execute command

Resets to 0 after execution.

Print

Prints the current state of the trend control. (Historical data are not printed.)

SPC

Opens a dialog which can be used to show the statistical process control (SPC) information for the selected trend:

• Draw Mode…

  • Shade: Draws the average value as a dashed line, and draws the min/max values and standard deviation as shaded areas.

  • Line: Draws the average value and standard deviation as dashed lines, and draws the min/max values as solid lines.

• Show average: Show the calculated average of all of the trend's historical values.

  Note: When a value is not a number (NaN) — for example, when a tag is flagged as BAD quality — it is counted as 0 for the purpose of calculating the average.

• Show min/max: Show the minimum and maximum historical values of the trend.

• Show standard deviation: Show the standard deviation of the trend. A low standard deviation indicates that the actual value tends to stay close to the average; a high standard deviation indicates that the actual value tends to vary greatly from the average.

The tag's Bit properties (B0–B4) can be used to open the dialog and pre-select options:

• tagname->B0

  • 1 = open dialog

    Resets to 0 after open.

• tagname->B1

  • 0 = Draw Mode: Line selected

  • 1 = Draw Mode: Shade selected

• tagname->B2

  • 0 = Show average cleared

  • 1 = Show average selected

• tagname->B3

  • 0 = Show standard deviation cleared

  • 1 = Show standard deviation selected

• tagname->B4

  • 0 = Show min/max cleared

  • 1 = Show min/max selected

Selection

Launches a dialog, where the user can replace the data point associated with the selected trend on the legend

Remove

Removes the selected trend from the trend control

Hide

When checked, the selected trend is visible; otherwise, it is hidden.

Pen Style

Launches an embedded dialog, where the user can modify the pen style of the selected trend.

Scale

When this box is checked, the Y axis scale is visible; otherwise, it is hidden. The scale can be hidden only when the Multiple Sections option is off.