dl-breadcrumbs__homedl-breadcrumb-item__separatorGetting started with example projectsdl-breadcrumb-item__separator...dl-breadcrumb-item__separatorExample project for central I/O expansiondl-breadcrumb-item__separatorProgramming and compilationdl-breadcrumb-item__separatorMain program PLC_PRG
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Main program PLC_PRGdl-permalink__symbolPermalink

In the default task configuration, there is one call of a POU (program organization unit) i.e. "PLC_PRG"⮫  (shown here).

In the project, "PLC_PRG" becomes the main program and contains calls to the other programs (POUs) that are created step by step.

Main_program_PLC

The PLC_PRG POU is defined by default in the ST (Structured Text) editor. Keep this setting because it provides good visibility of the instructions supports troubleshooting.

To improve project readability, store the created subroutines (POUs) in the previously created folder "10 POUs". The subroutines are created in the FBD (Function Block Diagram) editor.