Development of a web application for controlling PLC

U radu je opisano upravljanje dizalom pomoću programirljivog logičkog kontrolera. Radom programiljivog logičkog kontrolera (PLC) će se upravljati preko web sučelja. Opisana je uloga PLC-a u automatizaciji postrojenja, kao i pregled razvoja. Napravljen je pregled programskih jezika korištenih za programiranje PLC-a te jezika za razvoj web stranica. Opisano je kreiranje web sučelja za čitanje i unos podataka. Napravljen je program za rad makete dizala i web sučelje za upravljanje. Web sučelje se sastoji od prikaza zgrade, pokaznika i kontrolnog panela. Prilikom poziva dizala tipka mijenja boju, a dolaskom dizala na željeni kat mijenja se boja kata zgrade i na pokazniku se ispisuje trenutni kat. Za izradu je korišten PLC Siemens S7- 1200 s dodatnim signalnim modulom i napajanjem.The paper describes the operation of the elevator using a programmable logic controller. The operation of the programmable logic controller (PLC) will be managed through the web interface. The role of PLC in plant automation is described, as well as an overview of development. An overview of the programming languages used for the programming of PLC and the language for the development of websites has been made. It is described to create a web interface for reading and entering data. A program has been created for the operation of the elevator model and a web interface for control. The web interface consists of a representation of a building, a display and a control panel. When calling the elevator, the button changes color, and with the arrival of the elevator to the desired floor, the color of the floor of the building changes and the current floor is printed on the demonstration. The PLC Siemens S7-1200 with an additional signal module and power supply was used for construction