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Getting Started

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);

Requirement: The application is running the PLC_PRG program on the PLC.

  1. In the device tree, select the application and click Project → Add Object to add a new trace object.

    The corresponding trace editor opens with the commands available in the Trace menu.

  2. Click Trace → Configuration.

    The Trace Configuration dialog opens.

  3. Select a task for running the trace feature. Normally this is the same task that is running in PLC_PRG.

  4. Click Add Variable to add an entry to the tree view of the trace configuration and assign an IEC variable.

    Example: PLC_PRG.rSin

  5. Click Trace → Download Trace.

    CODESYS downloads the trace configuration to the controller. The application starts the data sampling and transfers the data to CODESYS. Then they are displayed as a graph in the trace diagram. Commands are provided for navigating through the samples and controlling the data sampling.

Example

Example 1. Tracing sine-shaped value history of the IEC variables PLC_PRG.rSin

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

_cds_img_trace_first_steps.png

  • (1): Configuration

  • (2): Add Variable



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