Discrete event control with CFC

[Abstrac] In this paper it is proposed a discrete event control system representation methodology to design, implement and operate sequential systems, as an alternative to the sequential function chart (SFC) description method. Such method uses the standard language ST (structured text) of the IEC 61131-3 associated to the standard language developed by the Foundation Fieldbus, by associating ST based descriptions language to some function blocks on the basis of a continuous function charts (CFC) or function block diagrams (FBD

Preliminary design study of a fuzzy tracking controller applied to a crane type manipulator

[Abstract] The main purpose of a control system is usually to force the output to follow a reference input with zero steady state error while satisfying certain transient requirements such the settling time for rapid following, overshoot and smoothness of the transient response. This paper is concerned with finding a fuzzy rule-based controller achieved by learning from a virtual feedback (PID) controller capable for satisfying rapid following, zero steady state error and overshoot suppression applied to robotized manipulators dedicated to heavy loads or big container handlin

Application of simulation to mechanical fault diagnosis by pattern matching with parity equations

[Abstract] The operation of technical processes requires increasingly advanced supervision and fault diagnosis procedures to improve reliability, safety and global efficiency. Simulation associated to signal analysis techniques offers an alternative solution to the field of detection and diagnosis. This paper deals with a basic method in supervision and fault diagnosis of mechanical equipment using simulation procedures to determine both, the ideal dynamic pattern and the faulty dynamic pattern. Then comparison of actual vibration spectrum with both patterns for extract a valid conclusion is the aim of thi

SFC++: A tool for developing distributed real time control

WESIC'98, Girona, Spain June 10, 11 and 12, 1998This paper describes a visual tool for developing real time software for the control of distributed manufacturing systems. The aim of this project, currently in progress, is to get a visual programming environment which integrates both the advantages of object oriented modelling for the design and simulation of systems and the power of modern distributed control systems (i.e. computers with real time operating systems interconnected by means of industrial real time networks). To bridge the gap between the object oriented system model and the implementation level, at which we have multiple parallel tasks running over a network, Sequential Function Charts are used as a standard formalism (IEC, 1988; UTE, 1992) for the description of system dynamics and control software programmin

The linear model of an unknown dynamic process

4th World Congress on Computational Mechanics, 1998, Buenos Aires, Argentina[Abstract] This work describes a novel algorithmic approach to find the linear model of any dynamic process. Dynamic behaviour as a knowledge concept is acquired by means of proposed learning algorithm, being supported by DAM (deterministic associative memory) system. Depending on the particular use of process model, (system simulation, control design, reproduction of dynamic behaviour, parameter identification, plant diagnosis...) information to and from DAM will be stored and retrieved as demanded from a particular application by applying the proposed algorithmic methodolog

Hybrid FDI on chemical plants

[Abstract] This paper illustrates an alternative implementation to automatic protection and supervision task using the basic principles of model-based fault-detection and isolation associated to the rule-based FDI with subsequent appropriate corrective actions. Hybrid systems may be precisely described by sequential function charts (SFC). Operation supervision of hybrid systems may be carried out simultaneously on the basis of such SFC description. As discrete event and continuous processes operate simultaneously in close cooperation, a strategy to diagnose such hybrid system by means of a structured methodology under SFC description tool on the IEC-848 standard is develope

De los reguladores convencionales a los reguladores basados en lógica difusa

[Resumen] En este trabajo se revisan los conceptos de control industrial referido a tareas de control típicamente afrontadas por medio de reguladores PID convencionales y que son susceptibles de ser resueltas mediante reguladores basados en reglas. Se proponen estrategias de compensación correctiva a partir de las acciones básicas de regulación mediante reglas difusas, así como la implementación de reguladores basados en reglas a partir del conocimiento adquirido acerca de los reguladores convencionale

Adaptación mediante gain scheduling bajo Foundation Fieldbus

[Resumen] Se describe una alternativa de implementación de control adaptativo mediante administración de ganancia (gain scheduling) utilizando las técnicas de diseño que ofrece el estándar Fundation Fieldbu