Structural synthesis of the control algorithm in a micro programmable controller

Sterowniki klasy micro mogą być z powodzeniem wykorzystywane do automatyzacji nieskomplikowanych instalacji przemysłowych, zawierających do kilkudziesięciu zmiennych procesowych o charakterze dwustanowym i/lub analogowym. W artykule przedstawiono metodykę tworzenia strukturalnego oprogramowania sterującego na przykładzie modelu laboratoryjnego układu sortowania materiału kolorowego, przy zastosowaniu sterownika klasy micro s7-200 CPU 224 z modułem rozszerzającym EM223.Micro programmable controllers can be successfully used for automation of unsophisticated industrial installations, containing up to several dozen process variables of two-state and/or analog nature. This paper presents a methodology of creation of structural control software as an example of the laboratory model for sorting colored material, using a class of a micro controller S7-200 CPU 224 with an extended module EM223. The structural synthesis naturally allows taking into account the specific hardware configuration of the control object and functional requirements during the process of control software design. The functional requirements determine the structure of software, i.e. a developer may divide the program into smaller units, corresponding to different functions of the plant. At the beginning, an idea of the structural programming (Fig. 1) with an example in the micro PLC is described. In the next part a detailed example of the hardware and software synthesis, related to a real plant (Fig. 3) is giving. A functional structure of the developed control system (Figs. 4, 5) has a great influence on the software structure (Fig. 6), what is described in details in that part. In the final part of this paper selected remarks about the structural implementation of the developed control algorithm in the s7-200 PLC are given and described