Overview
The CODESYS Application Composer is used to create applications by using existing modules. The user composes, parameterizes, and connects the required modules to form a complete application. This configuration does not require knowledge of PLC programming and can therefore be done by technicians without programming experience. Internal generators create complete, well-structured IEC 61131-3 applications including the I/O mapping and visualizations.
The CODESYS Application Composer consists of two main components:
- Module editor, which can be used to compose the software modules developed with the module declaration editor 
- Module declaration editor for developing modules 

For more information about the module editor, see: Module Editor
For more information about the module declaration editor, see: Module Declaration Editor