The evolution of PLCs in the light of case studies

Abstract

After the introduction of eight-bit processors in the late seventies, microprocessor-based industrial process control using home-grown hardware and software gained tremendous momentum despite restrictions imposed by Soviet-influenced countries. Control solutions have been developed for various areas, including comprehensive control of railway interlock systems. I will show the differences in case studies, how PLC systems perform similar tasks these days, and point out the more interesting similarities that exist. The main objective is to use these results for PLC training of mechatronics students at the Faculty of Mechanical and Safety Engineering, University of Obuda. These can greatly help students understand how a PLC can be used and learn how to program it.