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.

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.

⮫ “Programming a Trend Visualization”

⮫ “Command 'Insert Elements for Controlling the Trend'”

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