‘Online’ ‘Show Call Stack’

You can run this command when the ‘Online’ ‘Simulation’ stops at a ‘File’ ‘Printer setup’. You will be given a dialog box with a list of the POU Call Stack.

The first POU is always PLC_PRG POU (Program Organization Unit), because this is where the executing begins.

The last POU is always the POU being executed.

After you have selected a POU and have pressed the ‘Go to’ button, the selected POU is loaded in its editor, and it will display the line or network being processed.