This thesis focuses on creating an application that allows generation of PLC and HMI programs using TIA Openness. The application is programmed to separate logic from graphics, which is beneficial in case of a change of the visuals of the application. Generating programs is possible thanks to the XML transcription or by creating a configuration within the application guide. The generating is done by overwriting source XML files contained in the application library according to the selected configuration. The application was created with Framework Windows Forms in C#. A reference set of device modules has been created for PLC and HMI in the development environment of TIA Portal V15.1. The source XML files, on the basis of which the generating is carried out, were then obtained by exporting a reference set and placed into the application library. With a simulation tool Factory I/O and S-7 PLCSIM it was verified that the generated program is, thanks to the mapping of variables on pins of blocks, fully functional in manual mode. At the same time it was proved that it is possible to generate programs for different devices which signifies the versatile use of this application. The contribution of this work is the significant reduction of time when creating new PLC and HMI programs.