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
Start the application with F5.
- The target visualization appears. The visualization contains the trend diagram with the value curve of the variable. The controls enable user inputs.

Visualization of the sinusoidal trend of an IEC variable

The following objects are implemented in the project:

PLC_PRG
Visualization_Trend1
VisuWithTrend

The PLC_PRG program 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 displays the trend.

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

Properties	Value
Trend recording	Visualization_Trend1
Show cursor
Show tooltip
Show frame
Date Range Picker	: Trend1DateRangeSelector
Time Picker	: Trend1TimeSelector
Legend	: Trend1Legend

VisuWithTrend at runtime