Diseño de un sistema SCADA para la automatización de la planta de tratamiento de aguas de la empresa Cargill en San Rafael de Alajuela

Abstract

This document proposes the evaluation and design of a SCADA that achieves the automatization of Cargill’s Residual water treatment plant. To carry out the design proposal the company was consulted about the main needs that have to be covered. The purpose of the automatization is not only to improve the efficiency of the plant but to have a better preventive maintenance of the equipment. The design is not only based on the hardware but in the software as well, the design of a complete system is proposed from the sensors in the plant to the visualization software in the operator's computer that allows the control and supervise the plant remotely. The proposed solution shows the programming of the equipment to allow the autonomous control of the plant, in addition to the communication between devices of different types through the Modbus TCP/IP protocol. The project contemplates the use of different devices such as: motors, pumps, relays, electro valves, level sensors, flow sensors, frequency variators, controllers, PLCs, and others. The design considered the components that currently exist in the plant and those that must be acquired to achieve the final objective. Through an economic study, the feasibility of implementing the system was determined. The main idea of the project is to leave the design ready for an eventual implementation by the company, in case of carrying out the designed SCADA will be incorporated into the general SCADA with which the plant has.