Diseño e Implementación de un Sistema Scada para el Control PID de Nivel y Temperatura Independientes en Dos Tanques de la Planta de Procesos Análogos (PPA)

Abstract

A large part of the industrial processes require the control and supervision of the variables that intervene in them. As part of their academic training and in order to make an approach to the processes, for some years the engineering and control students are working in a Plant of Analog Processes (PPA) in the Francisco José de Caldas University Faculty of Technology, in which it is possible to find accessories used in the industry (programmable logic controllers (PLC), transmitters and actuators) that allows the manipulation of variables. However, the requirements of the elements of the mixing tank and the hot water tank require the incorporation of additional elements to improve the control of the level and temperature in these containers, the acquisition of the data of the processes involved and its supervision. For this reason we develop the design and implementation of a SCADA system for the PID control of level and temperature, independent for the mixing tanks and hot water respectively, with HMI for the operator, is carried out, previously making a diagnosis of the plant, in which was defined the installation of some equipment and infraestructure (piping and wiring) that allowed to carry out this activity successfully. The integration of the new signals to the available control system was made through the Raspberry PI 2 - Model B development platform, in which the CODESYS application is executed. This platform obtains the data within the reach of a PSOC 5 microcontroller and sends it to the PLC through the EtherNet / IP protocol. As part of the design of the digital PID controller, some Toolbox of the MATLAB software was used for the identification process of each of the systems (level and temperature), complemented by experimental methods and for the design by means of the "root locus" method The controllers were transformed into a "pseudocode" that could be implemented in the Allen Bradley PLC 1769-L23E. The SCADA system is complemented by the HMI PANELVIEW PLUS 600 from the same manufacturer. It is expected that with this project, the academic community of the university can benefit, by developing practices in which students can access the knowledge acquired in the different subjects of their degree, and in the same way modifications can be made with In order to optimize it.