Abstract
This article presents issues related to the design of sequential control systems. The algorithmic design method of sequential control systems is discussed, which allows the design of a diagram of any sequential system. The algorithmic method uses the description in the form of a connection formula. The connection formula defines the order of actuations of driver elements, in this case actuators. The algorithmic method is used, among others, for systems with actuators cooperating with distributors controlled electrically on both sides. The process of creating a system graph has been characterized. The operation of the system has been shown graphically. On the basis of the created graph describing the functions of signal processing, a method for rapid programming of sequential electro-pneumatic systems with the use of logic elements has been provided. A separate dedicated timing unit has been used to perform memory functions. Its operation is based on successive states, in such a way that the next state deletes the previous one. Graph-based systems have been validated through simulation using Festo’s FluidSim computer-aided design software.
Highlights
The quality and effectiveness of automation systems to a large extent depends on the technical characteristics of the systems applied in them
The simplest way to describe the system operation is a control narrative, which is transformed into descriptions in the form of an operating cycle diagram or connection formula
Modern developments require major technical novelty. Such novelty is achieved through the application of new elements and innovative connections, which often precludes the possibility of using known formulas
Summary
The quality and effectiveness of automation systems to a large extent depends on the technical characteristics of the systems applied in them. For systems with more than three inputs and eight internal states, the difficulty of using transition and output tables increases significantly; the synthesis algorithms become more complicated (for example, the excitation functions depend on seven arguments) and the chance of obtaining an optimal solution decreases [7]. In this situation, it seems advisable to search for methods reducing the difficulty of synthesis and eliminating the above-mentioned defects. To measure the position of the actuator in the technological process, precise, optoelectronic position transducers [15] should be used as a feedback for the proportional valve-actuator control system
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