Getting Started with Trace

Create a project with the following program.

PLC_PRG

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);

  1. In the device tree, select the application and add a new visualization by clicking Project ‣ Add object ‣ Visualization.

    ⇒

    The respective visualization editor opens.

  2. Add the Visualization object to the device tree below Application.

    ⇒

    An empty visualization appears.

  3. Open ToolBox ‣ Special control elements.

  4. Drag the Trace element to the visualization.

    ⇒

    The element properties are displayed on the right side.

  5. Click bfac90e59e98e904c0a8640e01d4e839_918bd000717d8157c0a8640e00a25eb5 in the Trace property.

    ⇒

    The Trace configuration dialog box opens.

  6. Click Add variable to add an entry to the tree view of the trace configuration and assign an IEC variable (for example, PLC_PRG.rSin).

  7. Select the MainTask in Task. The trace recording should by in the task where the PLC_PRG program is also located.

  8. Select the Insert elements for controlling trace command in the context menu.

    ⇒

    The Trace wizard dialog box opens.

  9. By default, all three control elements are activated in the dialog. Click OK to close the dialog box.

    ⇒

    The control elements are added to the visualization.

  10. Load the application to the controller and start it.

Example

Record the sine-shaped data of the IEC variable PLC_PRG.rSin

The PLC_PRG program is running on the PLC. When you follow the instructions for “Getting Started”, CODESYS displays the following trace diagram.

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Now you can use the elements for trace control for controlling the recording.

See also