The thesis describes operation and program of an extruder machine, whose control system was renovated within the scope of a project in the INEA company. Extruder is a machine which combines sequential and continuous processes. The result of those is processing of plastics into a product, which is in this case a continuous sheet of variable dimensions. Parts of the project, which were under my responsibility, are described in greater detail. The program itself is split into two parts: a program of programmable logic controller and a program of the human-machine interface. Both are written in Siemens TIA Portal v14 programming tool. The first part of the thesis is dedicated to the description of the machine, its devices and starting sequence. Next, description of the program and it’s structure, which is for the most part written in ladder logic with some exceptions in structured text, is given. In the end, a description of functionality of the human-machine interface is given.