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40th Anniversary International Conference on Information Systems Architecture and Technology (ISAT)

作者： Hojda, Maciej Filcek, Grzegorz Popek, Grzegorz Wroclaw Univ Sci & Technol Fac Comp Sci & Management Ignacego Lukasiewicza 5 PL-50371 Wroclaw Poland

ISBN: (纸本)9783030306045;9783030306038

This paper presents a method and a tool for converting sequential function charts into function Block Diagrams in a manner that models states with the use of flip-flops. Order of evaluation is enforced through the use of explicit delays. Presented approach can be used when SFC programming is not directly available but the developer wants to use advantages of SFC modeling.

关键词： sequential function chart function Block Diagram Programmable Logic Controller

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Research on Structural Analysis for the Petri-net representing sequential function chart

Research on Structural Analysis for the Petri-net representi...

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SICE Annual Conference

作者： Okuda, Makoto Nagao, Tatsuaki Mizuya, Tom Miyazawa, Iko Ind Technol Ctr Kanagawa Japan

ISBN: (纸本)9784907764432

In recent years, sequential control systems have become complex with increasing requirement specifications. Therefore, it is important to find bugs which might be contained in a sequential control system at each development phase. Currently, a main method for analyzing the system is behavior analysis. Though, we consider that it is necessary to analyze control structures of the system before behavior of that is analyzed. The control structures consist of loop, alternative and parallel structures. These structures are corresponding repeat, selection and parallel controls which are typical in control systems. We call structural analysis to detect and to distinguish these controls. By comparing both the results of the structural analysis and requirement specifications, the system can be verified. The purpose of this research is to shake out the bugs. This paper shows a method for analyzing control structures about sequential function chart elements which are defined by IEC 61131-3. Using the method, we can find the bugs, and we can fix the bugs before behavior of the system is analyzed. Therefore, we consider that structural analysis contributes improvement of productivity.

关键词： sequential control system sequential function chart Petri-net structural analysis

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Asset Administration Shell Submodel for Representing the Procedural Part of ISA-88 Recipes

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IEEE LATIN AMERICA TRANSACTIONS 2025年第1期23卷 36-42页

作者： Dominguez, Johnny Alvarado Vegetti, Marcela Gonnet, Silvio Asociac Invest Metalurg Noroeste Porrino Spain INGAR Avellaneda Santa Fe Argentina

It is undeniable the benefits that the implementation of digital twins provides to industries. However, the greatest advances in this regard have been made in the definition and implementation of digital twins in discrete manufacturing industries. The development of these twins is still in its early stages in process industries. An important issue in creating digital twins to support decision-making in the process industry is to be able to describe the production procedures. This paper aims to present an Asset Administration Shell submodel that allows the representation of procedural recipes in the batch process industry based on the ISA-88 standard. This paper proposes a conceptual model to represent the sequential function chart language, which is one of the languages proposed by the mentioned standard to represent manufacturing procedure. In addition, the proposal includes a set of rules to map sequential function chart concepts into concepts belonging to the Asset Administration Shell metamodel introduced by Platform Industrie 4.0. These mapping rules would allow the implementation of tools that automatically translate existing sequential function chart models into Asset Administration Shell submodels to reuse existing knowledge for the implementation of digital twins in batch process industries. Link to graphical and video abstracts, and to code: https://***/***/transactions/article/view/9224

关键词： Unified modeling language IEC Standards Digital twins Standards Software XML Translation Reviews Resource description framework Proposals asset administration shell digital twin ISA-88 procedure submodel sequential function chart

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Programming of a Lightweight Robot Using function Blocks and sequential function charts 25

Programming of a Lightweight Robot Using Function Blocks and...

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25th International Conference on Methods and Models in Automation and Robotics

作者： Thormann, Christian Winkler, Alexander Univ Appl Sci Hsch Mittweida Dept Automat Mittweida Germany

ISBN: (纸本)9781728173818;9781728173801

This paper presents an approach to realize a universal robot programming language. Currently, numerous programming languages for industrial robots exit, depending on the manufacturer of the robot. Attempts to create a standardized language have failed in the past. The presence of several new providers of robots on the market increases the number of different programming languages and concepts. For this reason, it would be desirable to have a unified procedure as can be found in the field of programmable logic controllers. Here, a specification is valid, which defines certain types of programming languages. In this contribution, a lightweight robot was connected to a programmable logic controller, where the programming of the robot should be performed. For this purpose, the communication between these two partner devices was achieved using precast data structures. Concerning the programmable logic controller, function blocks were developed to operate the robot and its periphery. They include robot-based functionality, known from common robot programming languages. With regard to the robot, a client program, which interprets and executes the commands from the programmable logic controller, was implemented. Some small robot tasks were performed to show the simplicity of our approach to robot programming based on the languages of programmable logic controllers.

关键词： Robot programming function block sequential function chart intuitive programming

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Design and analysis of sequential function charts using sensor-based stage Petri nets

Design and analysis of sequential function charts using sens...

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IEEE International Conference on Systems, Man and Cybernetics (SMC 03)

作者： Peng, SS Zhou, MC Department of Mechanical Engineering Chinese Military Academy Taipei Taiwan Dept. of Elec. and Comp. Engineering New Jersey Inst. of Technology Newark NJ United States

ISBN: (纸本)0780379527

sequential function chart (SFC) is currently one of the design diagrams for automated control systems to capture the sequence of operations executed by the system's control software. This method grows so complex that locating the cause when a problem is detected becomes extremely difficult. Researchers are constantly pursuing to develop tools that eliminate the limitations and increase the design performance using SFCs. etri nets are among the most widely used tools to model and evaluate the behavior of automated control systems. Petri net control of real-world systems is achieved by mapping sensor signals and actuator commands to Petri net transitions. Being a well-defined and well-developed tool based on a mathematical formulation, PN models are used to analyze and implement real-time control for discrete industrial systems. This paper discusses a methodology to convert the SFC of an automated control system for design and analysis using the sensor-based stage Petri nets (SBSPN). Appropriate rules are suggested to convert all the I/O sensors of SFC into stages Petri net picture. A pneumatic control system is illustrated as an example to demonstrate the practical use of this technique.

关键词： sequential function chart Petri nets stage control net real-time Petri nets sensor-based stage Petri nets

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LEARN, PROGRAM AND TEST sequential function chartS IN AN INTERACTIVE E-LEARNING COURSE

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IFAC Proceedings Volumes 2006年第6期39卷 583-588页

作者： J.P. Keller Automation University of Applied Sciences FHNW Riggenbachstr. 16 4600 Olten Switzerland

sequential function charts (SFC) according to IEC61131-3 are often not very popular in industrial automation. This is mainly due to the fact that it was not learned systematically or its capabilities were never experienced. The high-level interactive e-learning tool described in this contribution offers a didactically well structured step by step e-learning course, disclosing all the necessary details. A graphical SFC-editor allows the user to freely program his own SFC. The user is only restricted to predefined actions and transitions, but with the benefit that he or she can test acquired SFC with real-life plant simulations. Analysis of SFC based on Petri-Net theory and recipe control of batch plants complete the course.

关键词： sequential function chart Supervisory Control Interactive e-learning User interfaces Educational aids

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Microcontroller implementation of lookup table-based control functions with special emphasis on sequential control according to IEC 61131-3

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INTERNATIONAL JOURNAL OF ELECTRICAL ENGINEERING EDUCATION 2015年第2期52卷 111-130页

作者： Lamar, Krisztian Zalotay, Peter Obuda Univ Inst Automat Kando Kalman Fac Elect Engn H-1034 Budapest Hungary

This paper covers the possibility of retraining for those electrical engineering undergraduate students already having some basic digital knowledge. It gives a solution to lead the students to the microcontroller-based program control of complex industrial tasks with a uniform approach. It presumes that the students are familiar with combinational and sequential logic, know the hardware and software basics of microcontroller systems, and have experience in the use of C program language. Building upon these, it presents a lookup table-based control description system for simple combinational solutions to complicated sequential controls. It separately details this kind of implementation of sequential controls according to the sequential function chart (SFC) program language corresponding with the standard IEC 61131-3. For the processing of the tabular data describing the controls, it provides interpreter programs independent from the current tasks. Teaching outcomes are discussed in the final part of the paper.

关键词： Combinational control sequential control IEC 61131-3 sequential function chart microcontroller

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Automata generated test plans for fault diagnosis in sequential material- and energy-transfer operations

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CHEMICAL ENGINEERING SCIENCE 2014年 113卷 101-115页

作者： Kang, An Chang, Chuei-Tin Natl Cheng Kung Univ Dept Chem Engn Tainan 70101 Taiwan

Hardware failures are inevitable random events that occur in the operation life of a batch chemical plant. Based on the piping and instrumentation diagram (P&ID) of the given process and the sequential function chart(SFC) of its normal operating procedure, a system automaton and the corresponding "diagnoser" can be built to identify all observable fault propagation traces and, also, their root cause(s). Since the fault origin(s) of a trace may not be unique, there is a need to develop a nonconventional means to further enhance diagnostic performance. For this purpose, a novel approach is proposed in this study to synthesize the test plan of every undiagnosable trace on the basis of discrete-event system (DES) theory. In particular, all components at the failure-induced initial states and the required control specifications are first modeled systematically with automata and, then, an optimal supervisor(test plan) can be assembled accordingly so as to achieve the operation goal of differentiating the fault origins as much as possible. This proposed strategy has been tested successfully in a series of examples and the results of selected case studies are reported in this paper. (C) 2014 Elsevier Ltd. All rights reserved.

关键词： Fault diagnosis Test plan Automaton Material transfer Energy transfer sequential function chart

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SFC++:: a tool for developing distributed real-time control software

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MICROPROCESSORS AND MICROSYSTEMS 1999年第2期23卷 75-84页

作者： Martínez, XCP García, RF Univ A Coruna Dep Elect & Sistemas La Coruna 15011 Spain

This paper describes a visual tool for developing real-time control software for distributed industrial systems. The aim of this project currently in progress, is to obtain 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 on a network, sequential function charts (SFCs) are used as a standard formalism [12,16] for the description of system dynamics and control software programming. (C) 1999 Elsevier Science B.V. All rights reserved.

关键词： distributed computer control system object-oriented tool real-time system sequential function chart visual programming tool

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Application of GX simulator software in PLC program development

Application of GX simulator software in PLC program developm...

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2nd International Conference on Frontiers of Manufacturing and Design Science (ICFMD 2011)

作者： Zhao, Xuemei Shengda Econ & Trade Management Coll Zhengzhou Zhengzhou Henan Peoples R China

ISBN: (纸本)9783037852828

Simulation software is used to PLC program development,Engineering and technical personnel can get rid of the shackles of PLC hardware conditions,They can be flexible and independent to design and debug program. sequential function chart (SFC) is a programming method of efficient and simple in PLC program development,For complex procedures,The efficiency is very high,This paper introduces PLC program development and simulation with sequential function chart and simulation software,This method can greatly improve efficiency.

关键词： GX simulation software sequential function chart PLC program development

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