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检索条件"主题词=Programmable Logical Controller"

共 29 条记录，以下是11-20 订阅

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Secure IoT Platform for Industrial Control Systems 4

Secure IoT Platform for Industrial Control Systems

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4th International Conference on Platform Technology and Service (PlatCon)

作者： Shahzad, AAmir Kim, Young-Gab Elgamoudi, Abulasad. Sejong Univ Dept Comp & Informat Secur Seoul South Korea Al Zawiya Univ Dept Sci Comp Sience Zawiya Libya

ISBN: (纸本)9781509051403

Supervisory control and data acquisition (SCADA) systems, are part of industrial control system (ICS), have been playing crucial roles in real-time industrial automation and controls. Through the evolution of 3rd generation, or networks based system, SCADA systems are connected to almost types of networks such as wired, wireless, and cellular and satellite communication, but security is still a big challenge for SCADA system while communicating within. Internet of things (IoT) is a ubiquitous platform, a new advance enhancement, for efficient SCADA system, where billions of network devices, with smart sensing capabilities, are networked over the Internet access. Deployment of smart IoT platform, SCADA system will significantly increase system efficiency, scalability, and reduce cost. Security is still a major issue for both-, as they were initially designed without any priority and requirements of security. This study modeled IoT-SCADA system and deployed a security mechanism, employing of cryptography based algorithm, which provided a secure transmission channel while each time communication occurred, between the field devices in the SCADA system. Proposed security implementation, and computed measurements analyzed as potential security building block against authentication and confidentiality attacks.

关键词： Internet of things Industrial control system Supervisory control and data acquisition programmable logical controller remote terminal units Advance encryption standard Introduction

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Remote Fault Diagnosis for Ion Nitrogen Furnace System 4

Remote Fault Diagnosis for Ion Nitrogen Furnace System

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4th International Conference on Intelligent System and Applied Material (GSAM)

作者： Cai, Limin Li, Peng Jianghan Univ Sch Phys & Informat Engn Wuhan 430056 Hubei Peoples R China Jianghan Univ Grad Fac Wuhan Hunan Peoples R China

ISBN: (纸本)9783038353140

In this paper, we propose a network-based remote diagnosis system for ion nitrogen furnace. This system consists of the site measurement, control and diagnosis end, GPRS communication module, and remote fault diagnosis end. This system can collect and transmit data for the remote fault diagnosis. Experiments demonstrate that the proposed system can satisfy the user-specified requirements.

关键词： Ion nitrogen furnace Remote diagnosis Fault diagnosis programmable logical controller Monitor and Control Generated System

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INVESTIGATION OF AUTOMATIC CONTROL SYSTEM IN WOOD DRYING FACILITIES 7

INVESTIGATION OF AUTOMATIC CONTROL SYSTEM IN WOOD DRYING FAC...

引用

7th International Conference on Electrical and Control Technologies, ECT 2012

作者： Karaliunas, Bronius Lukosiene, Dalia Andriusiene, Liudmila Vilnius Gediminas Tech Univ Vilnius Lithuania Vilnius Coll Technol & Design Vilnius Lithuania

ISBN: (纸本)9781634398015

The article analyses the automatic control systems in modern wood drying facilities as well as their functions and possibilities. The analysis of the publications available [1, 2, 3] indicates that nowadays there are widely applied in our country various types of wood drying facilities with different level of automation. Although the possibilities of the fully computer-assisted control systems at the wood drying facilities are considered to be rather extensive, but in the scientific publications available there has been noticed the shortage regarding the information on the structure of the systems, the algorithm concerning the manufacturing processes, programs, sensors and their interrelation and correlation.

关键词： wood drying facility automatic control programmable logical controller frequency converter temperature moisture humidity algorithm heating

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Study Control System Based on Creep Test in High Density Baler

Study Control System Based on Creep Test in High Density Bal...

引用

International Conference on Manufacturing Engineering and Automation

作者： Lee, Wei Wang, Chunguang Inner Mongolia Agr Univ Mech & Elect Engn Coll Hohht 010018 Peoples R China

ISBN: (纸本)9780878492268

Hydraulic transmission system controls hydraulic cylinder forward and backward movement freely, in order to achieve high density hydraulic baler work circulation. Creep test required hydraulic system to output constant stress, and study creep tests can not be completed when used succeeding the electrical contact style in the past time. The system used programmable logic controller (PLC) to instead of succeeding the electrical contact style and realized freely forward and backward movement of hydraulic cylinder, electro-hydraulic proportional relief valve can adjust hydraulic system and make it stepless pressure regulation and then degree of automation and reliability in hydraulic control system to be improved. This paper introduces aspects: including the selection, hardware configuration and program of PLC, meanwhile, giving specific realization method. Through the control system to study creep test in hydraulic baler, adopting the National Instrument (NI) company's multi-channel data acquisition card, which type is USB-6251,applying Labview8.2 to write data acquisition program on my own, the versatility and flexibility of system was verified, which was able to complete creep test successfully.

关键词： Hydraulic pressure control system Creep test programmable logical controller

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A Technique for Bytecode Decompilation of PLC Program 2

A Technique for Bytecode Decompilation of PLC Program

引用

2nd IEEE Advanced Information Technology, Electronic and Automation Control Conference (IAEAC)

作者： Lv, Xuefeng Xie, Yaobin Zhu, Xiaodong Ren, Lu State Key Lab Math Engn & Adv Comp Zhengzhou Henan Peoples R China

ISBN: (纸本)9781467389792

Program logical controllers (PLCs) are the kernel equipment of industrial control system (ICS) as they directly monitor and control industrial processes. Recently, ICS is suffering from various cyber threats, which may lead to significant consequences due to its inherent characteristics. In IT system, decompilation is a useful method to detect intrusion or to discovery vulnerabilities, however, it has yet not been developed in ICS. In this work, we present a technique to decompile the bytecode of PLC program. By introducing the instruction template and operand template, we propose a decompiling framework, which is validated by 11 PLC programs. In disassembling experiments, the present framework can cover all instructions with disassembling accuracy reaching 100%, this fully shows that our framework is able to effectively decompile the bytecode of PLC programs.

关键词： programmable logical controller bytecode decompilation mapping rules

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Synthesis and implementation of supervisory control for manufacturing systems under processing uncertainties and time constraints 15th

Synthesis and implementation of supervisory control for manu...

引用

15th IFAC Workshop on Discrete Event Systems (WODES)

作者： Szpak, Rodrigo de Queiroz, Max Hering Cury, Jose Eduardo Ribeiro Inst Fed Santa Catarina BR-89801050 Chapeco SC Brazil Univ Fed Santa Catarina BR-88040900 Florianopolis SC Brazil

In this paper, we exploit the supervisory control theory to synthesize a responsive control logic that assures non-blocking, safety, and time constraints in a manufacturing system subject to uncertain processing times arising from direct human intervention and flexible operations. A modular approach is used to compute a set of timed supervisors and a reduced coordinator that forces machine operations or inhibits human interventions in a minimally restrictive way. A new architecture for structured implementation of timed supervisors in programmable logic controllers is presented and applied to a real-world test-bench. Copyright (C) 2020 The Authors.

关键词： Timed Modular Local Control Manufacturing Systems programmable logical controller

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Multicriteria Optimization of Ethylene Dichloride (EDC) Dehydration Process with Use of Neural Networks

Multicriteria Optimization of Ethylene Dichloride (EDC) Dehy...

引用

International Conference on Industrial Engineering, Applications and Manufacturing (ICIEAM)

作者： Muravyova, E. A. Mikhaylova, Yu K. Ufa State Petr Technol Univ Ufa Russia

ISBN: (纸本)9781538681190

The article raises the issue of the determination of optimum values of technological parameters, necessary for the development of an effective control system of a technological process, on the basis of the experimental data collected when carrying out such a technological process for receiving a ready-made product of a required quality - 1.2 dichloroethane with the moisture content of no more than 0.001%. For the solution of the problem, the following tasks were set: to find the optimum values of the technological process parameters and to develop the operating program for the programmable logical controller which will provide for a necessary quality of a product of the technological process. As a criterion function for finding the optimum parameters of the moisture content of the dehydrated dichloroethane, the temperature and a pressure cubed column are selected as changeable parameters. Multicriteria optimization is performed with the use of a combination of neural network and the methods of minimization on the correct simplex and minimization of the Nelder-Mid on correct triangle and on basic vectors where neural network is applied to the description of a criterion function. As a result, after the calculation the values of technological parameters are received in three ways, and those values at which the quality of the received product corresponds to required quality are chosen. The correctness of the received values is checked with the use of the map of lines of the criterion function level. Also, with the use of the calculated parameters of a technological process, the operating program for the programmable logical controller, thanks to which the values of technological parameters are achieved and maintained so that the obtained ready-made product of the studied technological process - dehydrated dichloroethane - had the quality necessary for its further use in production, was developed.

关键词： multicriteria optimization neural networks ethylene dichloride (EDC) dehydration programmable logical controller control program minimization two-layer perceptron

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Řízení manipulační linky suchých výrobků

Řízení manipulační linky suchých výrobků

引用

作者： Stříž, Martin Brno University of Technology

Cílem projektu je vytvořit program pro řídící systém manipulační linky suchých betonových výrobků. Řídí systém je tvořen modulárním programovateln&... 详细信息

Cílem projektu je vytvořit program pro řídící systém manipulační linky suchých betonových výrobků. Řídí systém je tvořen modulárním programovatelným automatem firmy Siemens Simatic S7-300. Obsluha s tímto systémem pracuje prostřednictvím ovládacího pultu s tlačítky a dotykovým displejem TP 177A. Součástí programu jsou řídící funkce pro dopravníky, manipulátor a také správa receptur. V teoretické části je provedeno výkonové dimenzování dvou elektrických motorů podle požadavků mechanických systémů na jejich točivý moment. Jsou popsány základy programovaní PLC podle normy IEC 61131-3 včetně popisu pěti základních programovacích jazyků. Praktická část obsahuje postup tvorby projektu v prostředí programu Step 7 a popis funkce řídícího systému a jeho obsluhy.

关键词： Simatic Programovatelný automat Řídicí program elektrický pohon Simatic programmable logical controller Control program Electric drive Text

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Řídicí systém pro dávkování chemikálií v chemické úpravně vody

Řídicí systém pro dávkování chemikálií v chemické ...

引用

作者： Kolman, Aleš Brno University of Technology

Bakalářská práce se zabývá modernizací stávajícího systému řízení Chemické úpravny vody (CHUV) v Kolíně. Důvodem je snížení provozn... 详细信息

Bakalářská práce se zabývá modernizací stávajícího systému řízení Chemické úpravny vody (CHUV) v Kolíně. Důvodem je snížení provozních nákladů a zlepšení kvality upravené vody. Tato práce obsahuje návrh hardwarové koncepce, řídicího programu pro PLC a návrh displejů pro HMI rozhraní. Další částí je návrh vizualizace procesu. Nový řídicí systém bude založen na PLC typu FOXTROT od firmy Teco a.s. Program pro PLC bude napsán v jazyce strukturovaného textu ST a odladěn ve vývojovém prostředí MOSAIC od firmy Teco a.s. Obsluha CHUV bude mít pro řízení k dispozici operátorský panel i samostatné PC obsahující vizualizaci procesu úpravy vody vytvořenou v programu RELIANCE 4.

关键词： řídicí systém chemická úprava vody PLC programovatelný logický automat vizualizace strukturovaný text programování SCADA Control system chemical water treatment PLC programmable logical controller visualization structured text programming S

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Proteção adaptativa em redes de distribuição de energia elétrica utilizando relés digitais e controladores lógicos programáveis

Proteção adaptativa em redes de distribuição de energia ...

引用

作者： Souza Junior, Waldery Pereira de Universidade Estadual Paulista

Com a crescente utilização de fontes de energia renováveis nos últimos anos por parte do consumidor, são necessárias as análises do sistema de energia elétrica para avaliar os i... 详细信息

Com a crescente utilização de fontes de energia renováveis nos últimos anos por parte do consumidor, são necessárias as análises do sistema de energia elétrica para avaliar os impactos da conexão destes geradores. Sabe-se de um modo geral que a conexão de geradores distribuídos (GDs) causa alteração nas correntes de curto-circuito e principalmente nas correntes de carga fornecidas pelas subestações (SEs), causando desligamentos indevidos, descoordenação de dispositivos, sub alcance da proteção de sobrecorrente temporizada, entre outros. Este trabalho propõe a implementação de proteção adaptativa em relés digitais comerciais, considerando a inserção de GDs (fotovoltaica) em redes de distribuição de energia elétrica utilizando um controlador lógico programável (CLP) para controlar os valores de pickup da função de sobrecorrente temporizada de fase (51) dos relés, conforme a inserção de GDs no sistema. A implementação foi realizada utilizando dois relés de proteção GE Multilin Modelos UR F35 – Proteção de Alimentadores e um CLP GE IP. A ideia apresentada no trabalho consiste em propor uma solução para que o sistema de proteção mantenha a coordenação e seletividade, utilizando condições e cálculos que alterem automaticamente o pickup da função 51 sempre que houver a inserção de GDs e de acordo com o percentual de variação da corrente de carga fornecida. Utilizou-se o sistema de 13 barras do IEEE, com um perfil de carga real, sendo simulada a inserção de GD de 0% a 100% através do software DIgSILENT®, largamente empregado pelas concessionárias de energia elétrica, garantindo a confiabilidade para os resultados obtidos. Para validar as simulações, utilizou-se uma caixa de testes hexafásica PONOVO, injetando as correntes nos relés conforme as simulações previamente realizadas pelo software DIgSILENT®. Os resultados mostram a eficiência e robustez da proteção adaptativa proposta visto que a metodologia foi capaz de manter a coordenação e a seletividade do sistema de proteçã

关键词： Proteção adaptativa Geração distribuída Relés de proteção digitais Controlador lógico programável Adaptive protection Distributed generation Digital protection relays programmable logical controller Dissertação de mestrado

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