Getting Started with Trend Visualization

When you execute a Trend, it is best to proceed with user guidance and the help of the trend wizard.

Development of a visualization with trend

Create an empty standard project and program at least one variable into PLC_PRG.

⇒ PLC_PRG is declared and implemented
Add the Visualization object to the device tree below Application.

⇒ An empty visualization appears.
Open Toolbox ‣ Special Control .
Drag the Trend element to the visualization

⇒ The Trend Recording dialog opens with the Recording Settings.
Select the task in which the trend recording will be executed.

Note

In general the trend recording runs in the same task as the main program, i.e. PLC_PRG.

Therefore, select MainTask.
Add a trend variable with Add Variable and assign an IEC variable from PLC_PRG to the trend variable.
Click OK to close Trend Configuration.

⇒ There is a newly created object of the type Trend recording under Trend Recording Manager. The active visualization contains a Trend element that is selected.
Click Visualization ‣ Insert Elements for Controlling Trend Elements .

⇒ The Trend Wizard dialog box opens.
By default, all three control elements are activated in the dialog. Click OK to close the dialog box.

⇒ The active visualization contains a Trend with control elements.
Set the application containing the trend objects to active.
Compile the application with F11.
Click Online ‣ Login .
Start the application with F5.

⇒ The target visualization appears. The visualization contains the trend diagram with the value curve of the variable. The control elements enable user inputs.

Example: Visualization of the sinusoidal trend of an IEC variable.

The following objects are implemented in the project:

PLC_PRG
Visualization_Trend1
VisuWithTrend

PLC_PRG

PLC_PRG runs as part of the application on the controller.

PROGRAM PLC_PRG
VAR
        iVar : INT;
        rSin : REAL;
        rVar : REAL;
END_VAR

iVar := iVar + 1;
iVar := iVar MOD 33;

rVar := rVar + 0.1;
rSin := 30 * SIN(rVar);

Visualization_Trend1

Visualization_Trend1 is the object that contains the configuration of the trend recording.

VisuWithTrend

VisuWithTrend is the object that visualizes the trend.

The visualization contains four elements: one Trend and three control elements. The properties of the trend are defined as follows.

Properties	Value
Trend recording	Visualization_Trend1
Display cursor
Display tool tip
Show frame
Date Range Picker	Trend1DateRangeSelector
Time Picker	Trend1TimeSelector
Legend	Trend1Legend

VisuWithTrend at runtime