American Journal of Engineering Research (AJER) 2018 American Journal of Engineering Research (AJER) e-ISSN: 2320-0847 p-ISSN : 2320-0936 Volume-7, Issue-1, pp-46-52 www.ajer.org Research Paper Open Access www.ajer.org Page 46 Event Discrete Control Strategy Design of Overhead Crane embedded in Programmable Logic Controller Wenllson Carlos Ferreira Leite 1 , Geilson Abreu Costa 1 , Igor Lopes de Castro 1 , Ernesto Franklin Marçal Ferreira 3 , José Pinheiro de Moura 2 ,João Viana Da Fonseca Neto 1 1 (Department of Electrical Engineering/ Federal University of Maranhão, Brazil) 2 (Center of Technological Sciences/ State University of Maranhão, Brazil) 3 (Department of Education / Institute of Technology of Maranhão, Brazil) Corresponding Author: Wenllson Carlos Ferreira Leite ABSTRACT: The main objective of this article is a control strategy for a crane. Specifically, reduce as load oscillations during their displacement trajectory, in order to ensure the safety of the operators and the own load carried during the displacement. Moreover, as overhead cranes are most often complete and difficult to be mathematically modeled, seen in the industrial process, Classic Control Systems techniques based on Proportional, Integral and Derivative Controllers (PIDs) embedded in Programmable Logic Controllers (PLCs) ). The general proposal of this article is a system, instead of C.E.S(Continuous Event System) and D.E.S(Discrete Event System), able to control the dynamic effect of the load and of the production of the prototype in a reduced scale, through a Programmable Logic Controller. Keywords - Industrial Processes, Crane Control, PID Control, Programmable Logic Controllers --------------------------------------------------------------------------------------------------------------------------------------- Date of Submission: 26-12-2017 Date of acceptance: 11-01-2018 --------------------------------------------------------------------------------------------------------------------------------------- I. INTRODUCTION The Crane is an equipment used by several industry segments to carry out the lifting of loads for a certain period of time, the main objective of this project is that in an industrial environment it helps the transport of loads, reducing the physical efforts preventing wear, aiming at the health and avoiding diseases acquired at work. The cranes present a serious problem with the angular movement that the load performs during its displacement, this movement known as pendulum effect is decisive when we deal with the risks that this causes to the people, the structure and the own load transported. It is considered that these balances, in addition to hindering the transport and positioning of these loads, also endanger the health and life of the operators, as well as the integrity of the equipment and cargo, which are often of great economic value. The main objective of this paper is to raise the model of the proposed plant seeking to reproduce the behavior of the crane system, evaluating the performance of the system through model-based analysis, designing and simulating Proportional Integral and Derivative (PID) controllers to maintain control of the oscillation of the load during the transport process of the same, to construct a small scale prototype of the crane, for tests and tests of the automatic control developed. II. THE OVERHEAD CRANE SYSTEM In this section we present the crane system that was developed. This system consists of the gantry, formed by two parallel bars, that performs the translation movement on the  - axis, the carriage that performs the movement on the  - axis the winch that performs the suspension movement of the load on the  - axis. movements on the ,    axes are performed by electric motors, which designate the torque needed to move the load. The crane was designed according to the project, as shown below.