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International Conference on Systems, Signals and Image Processing

作者： Stanislav Dlhan Department of Telecommunications FEI STU Bratislava Ilkovicova 3 812 19 Bratislava Slovakia

ISBN: (纸本)9788022728560

Today's PLC systems are mostly limited in transmission speeds to several kilobits per seconds. Such speeds are certainly not sufficient for running popular services like a broadband Internet, a teleworking or the Video on Demand. This fact is reducing a chance of the PLC technology's deployment in a wide range. One way how to overcome this problem could be in introduction of optimal errors correcting techniques into the PLC technology. In this contribution, different types of coding techniques are discussed, including RS, Turbo or Convolutional codes. Theoretical analyses are focused on their positive and negative features visible in case of their deployment in the PLC transmission environment. Special attention is pointed to their robustness against noises, which is analyzed also practically in form of the simulations. Analyses and simulations are done for individual codes as well as combination of codes.

关键词： The PLC environment The PLC transmission channel The PLC simulation model RS Turbo code Convolutional code convolutional coding turbo codes programmable logic controllers deployment Forward error correction Noise

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Optimization for P&ID Development: The Time Efficient Approach

Optimization for P&ID Development: The Time Efficient Approa...

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IEEE International Conference on Recent Trends in Electronics, Information & Communication Technology

作者： Gaurav Bandal Manoj Sidhapura Keshwanand Appalwar Pramod Kanjalkar Instrumentation Engineering Vishwakarma Institute Of Technology Electrical Design Atlas Copco (India) Ltd.

ISBN: (数字)9781538624401

ISBN: (纸本)9781538624418

This Piping and Instrumentation Diagram (P&ID) standardization in process industry makes a lot of sense. P&ID is a kind of control document. Many projects of similar kind are executed over time with some project specific changes. For such a project, designing fresh P&ID or editing old P&ID does take huge time. The mistakes in old versions are carried forward in next project as well. Instead of preparing new P&ID from scratch or editing previous projects P&ID, we standardize it. Standardizing is not only referring standard philosophy but also minimizing development hours to reduce time to market. Our method proves to be time efficient as well as fewer howlers. Onetime efforts can save many man hours. In this paper Instrumentation and other equipment option for an application are prepared in AutoCAD. Document thus prepared can be very much helpful while bidding also. As P&ID is the document of high importance in initial phase of project, if it could be completed in very short time then will be much beneficial to organization. Time and quality are measure constraints of project management, time invisibly refers to cost, and thus time for development of P&ID must be reduced.

关键词： Autodesk autoCAD Control document DCS FAT ISA s 5.1 P&ID PLC SAT Proportional Integral Derivative Control Pelvic Inflammatory Disease Fats SEMI-AUTOMATIC TRIM College Entrance Examination Board Scholastic Aptitude Test programmable logic controllers direct current development time Standardization

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PLC implementation of economic model predictive control for scheduling and dispatch in energy systems

PLC implementation of economic model predictive control for ...

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ETG Congress 2021

作者： Tobias Kull Bernd Zeilmann Gerhard Fischerauer

The increasing share of decentral renewable energy in Germany requires the flexibilization of prosumers in the electricity grid. Prosumers that can shift power demand from high price intervals to low price intervals can make use of time-variable electricity prices. In this research an optimization-based method called economic model predictive control (MPC) is implemented on field-typical hardware to show practical considerations of this application. The implementation is evaluated in a hardware-in-the-loop test bench using simulation data obtained from measurements in an existing production facility. In this manner, we demonstrate that the field application of economic MPC is feasible and can generate economic benefits for the energy system operator.

关键词： ENERGY SYSTEMS Dispatching Economic Models Predictive control distributed model predictive control nonlinear model predictive control Power demand Prices Maximum Allowable Concentration simulated data programmable logic controllers Economic benefits Hardware-in-the-loop testing Computer hardware

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Technique study of measuring system of the coal powder silo with level meter

Technique study of measuring system of the coal powder silo ...

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2nd Conference on Environmental Science and Information Application Technology, ESIAT 2010

作者： Zheng, Haiming Guo, Tieqiao School of Energy and Mechanical Engineering North China Electrical Power University Baoding China

ISBN: (纸本)9781424473885

In order to realize automatic control of production and management and ensure every productive link safely and efficiently improve productivity and management level, it is imperative to successively monitor each coal bunker level and master storage quantity of that with modernization development of fossil-fuel power plant. Automatic level monitoring system of coal bunker raised by the paper are simple in structure and small in bulk, that especially the hammer's weight and bulk are small, and chance of that covered up by coal is greatly decreased. Sensitivity is increased by adopting tension sensor to detect tension change, accuracy improved by adopting Hall sensor to measure displacement of the hammer, reliability increased by adopting solid state relay as control script, flexibility and adaptation enhanced by adopting programmable logic controller as control system. The system can fixed time and successively detect level of the coal bunker, has function of digital display, self-check, programmable control, up and down limit sound and light alarming etc. The automatic level monitoring system of coal bunker can be used to detect level of the coal bunker, and that of metallurgy mines and cement plant, and so on as well. Its utilization will be great economical and social benefits. ©2010 IEEE.

关键词： programmable logic controllers

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Evaluation of a Newly Developed Model-Driven PLC Programming Approach for Machine and Plant Automation

Evaluation of a Newly Developed Model-Driven PLC Programming...

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IEEE International Conference on Systems, Man, and Cybernetics

作者： Martin Obermeier Daniel Schutz Birgit Vogel-Heuser Technische Universitat Munchen Institute of Automation and Information Systems

ISBN: (纸本)9781467317139

In machine and plant automation model-driven programming of programmable logic Controller (PLC) software is becoming an alternative to the state-of-the-art programming. As part of the related work the authors first present the results of a previously finished project on model-driven approaches for Multi Agent System (MAS) PLC programming, in particular using the Systems Modeling Language (SysML). A tool supported procedure model was developed that assists automation engineers implementing MAS in order to enhance reliability of the plants as well as reusability of implemented modules. Subsequently, related work on the evaluation of PLC programming approaches is discussed and the qualitative evaluation study for our newly developed procedure model is presented. In the last section, we present the study results and discuss our findings and their meaning for future developments and experiments.

关键词： Intelligent systems Usability Modeling SysML Automation PLC programming factory automation programmable logic controllers Programming Multi-agent systems Outcome Studies machine magic angle spinning Technological forecasting Reusability

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IP that fits

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Electronic Design 2005年第8期53卷 41-42页

作者： Bursky, Dave

The importance of intellectual property (IP) in system and system-on-a-chip (SoC) design, is discussed. The greater complexity of the systems being implemented on a chip, plus shorter time-to-market requirements, has made IP more crucial. Through the Virtual Socket Interface Alliance (VSIA), many companies have worked side by side to come up with a set of common guidelines and standards for IP. IP also plays a vital role in highly integrated FPGA solutions. Processor cores are in high demand, as are specialized I/O functions like PCIExpress, high speed serial interfaces, double data-rate DRAM controllers, and standard parallel PCI buses.

关键词： programmable logic controllers

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Development of processor directly executing IEC 61131-3 language

Development of processor directly executing IEC 61131-3 lang...

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SICE Annual Conference

作者： Motohiko Okabe Microelectronics & System Components Department TOSHIBA CORPORATION Tokyo Japan

ISBN: (纸本)9784907764302

Language processor of unified controller nv series which is PLC (programmable logic controller), and is the DCS (distributed control system) controller is developed. The controller nv series has the features that is high performance and high reliability. Language processor qualified the features with hardware logic execution and redundant circuit architecture. Controllerpsilas application program for PLC or DCS is described by international standard IEC 61131-3 programming language. Program high operation performance is powered by language processor, which is designed to execute IEC 61131-3 language instructions directly with hardware logic, then the execution time of the sequence instructions can be set 20 ns (1/2 compared with our company late product) and the control cycle time is from 0.5 ms or more. Controller high reliability has been achieved by the card redundant configuration and the ECC (error check and correct) circuit applied to internal memories.

关键词： Controller PLC DCS IEC 61131-3 Performance Reliability Hardware controllers programmable logic controllers Computer hardware language processor operating performance direct current International Electrotechnical Commission Memory

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K-ST: A Formal Executable Semantics of the Structured Text Language for PLCs

arXiv

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arXiv 2022年

作者： Wang, Kun Wang, Jingyi Poskitt, Christopher M. Chen, Xiangxiang Sun, Jun Cheng, Peng The College of Control Science and Engineering Zhejiang University Zhejiang310027 China The School of Computing and Information Systems Singapore Management University Singapore

programmable logic controllers (PLCs) are responsible for automating process control in many industrial systems (e.g. in manufacturing and public infrastructure), and thus it is critical to ensure that they operate correctly and safely. The majority of PLCs are programmed in languages such as Structured Text (ST). However, a lack of formal semantics makes it difficult to ascertain the correctness of their translators and compilers, which vary from vendor-to-vendor. In this work, we develop K-ST, a formal executable semantics for ST in the K framework. Defined with respect to the IEC 61131-3 standard and PLC vendor manuals, K-ST is a high-level reference semantics that can be used to evaluate the correctness and consistency of different ST implementations. We validate K-ST by executing 567 ST programs extracted from GitHub and comparing the results against existing commercial compilers (i.e., CODESYS, CX-Programmer, and GX Works2). We then apply K-ST to validate the implementation of the open source OpenPLC platform, comparing the executions of several test programs to uncover five bugs and nine functional defects in the compiler. © 2022, CC BY.

关键词： programmable logic controllers

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Towards a trusted execution environment via reconfigurable FPGA

arXiv

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arXiv 2021年

作者： Pereira, Sérgio Cerdeira, David Rodrigues, Cristiano Pinto, Sandro Universidade do Minho Portugal

Trusted Execution Environments (TEEs) are used to protect sensitive data and run secure execution for securitycritical applications, by providing an environment isolated from the rest of the system. However, over the last few years, TEEs have been proven weak, as either TEEs built upon securityoriented hardware extensions (e.g., Arm TrustZone) or resorting to dedicated secure elements were exploited multiple times. In this project, we introduce Trusted Execution Environments On-Demand (TEEOD), a novel TEE design that leverages the programmable logic (PL) in the heterogeneous system on chips (SoC) as the secure execution environment. Unlike other TEE designs, TEEOD can provide high-bandwidth connections and physical on-chip isolation. We implemented a proof-of-concept (PoC) implementation targeting an Ultra96-V2 platform. The conducted evaluation demonstrated TEEOD can host up to 6 simultaneous enclaves with a resource usage per enclave of 7.0%, 3.8%, and 15.3% of the total LUTs, FFs, and BRAMS, respectively. To demonstrate the practicability of TEEOD in realworld applications, we successfully run a legacy open-source Bitcoin wallet. © 2021, CC BY.

关键词： programmable logic controllers

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Automated Test Suite Generation to Test Modular Designed Packaging Machines using Fault Injection and a Simulink-based Simulation Approach

Automated Test Suite Generation to Test Modular Designed Pac...

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IEEE International Conference on Automation Science and Engineering

作者： Franziska Wiebe Susanne Rosch Sebastian Rehberger Birgit Vogel-Heuser Institute of Automation and Information Systems Technical University of Munich

ISBN: (纸本)9781509024100

In spite of the rising complexity and functionality of programmable logic Controller (PLC) software, a high degree in quality and reliability has to be guaranteed for automated production systems. Applying structured testing, faults can be recognized and eliminated early during the engineering process. Therefore, in this paper an approach for automatic test suite generation implemented with Fault Injection (FI) for modular production systems is presented. The automatically generated test suite consists of test cases selected out of a test case library. The approach is developed based on the simulation environment MATLAB/Simulink and evaluated with a PLC of a packaging machine as hardware-in-the-loop test. The goal of this paper is the development of an automatic test suite generation approach with fault injection conducted with modular packaging machines.

关键词： Packaging machinery CASING INSPECTION programmable logic controllers faults Automatic testing Production systems Modularity Injections Automated Production Systems

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