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Estimation of optimal safety parameters for a communication channel with required SIL 3 at runtime 29

Estimation of optimal safety parameters for a communication ...

引用

29th European Safety and Reliability Conference, ESREL 2019

作者： Gaus, Larissa Schwarz, Michael Börcsök, Josef Computer Architecture and System Programming University of Kassel Germany

ISBN: (纸本)9789811127243

In this paper, the optimization of safety parameters for a communication channel with the required safety integrity level (SIL) 3 at runtime is investigated. In order to guarantee the safe communication additional measures are needed. One of them is the black channel principle. It allows the transfer of safety related packets over the safety layer parallel to safety irrelevant data. Another method is the protection by a linear code, typically by cyclic redundancy check (CRC). In terms of the safety level, the information channel can be assumed as a generalized erasure channel (GEC) with the set of output symbols (0, e, 1). For this channel a formula for probability of failure per hour (PFH) can be derived using the parameters: bit error ratio, bit loss rate, message rate, code block length and weight spectrum. Within the safety layer, the communication occurs in the send-/receive-response principle (cyclic mode) and the messages can have a length defined by bounds on nmin and nmax. Accordingly, the optimization problem is formulated to minimize the PFH value by optimizing the message length for changing parameter values. © 2019 European Safety and Reliability Association. Published by Research Publishing, Singapore.

关键词： Bit error rate

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SILCaS - A new approach to calculate safety loops

SILCaS - A new approach to calculate safety loops

引用

11th International Probabilistic Safety Assessment and Management Conference and the Annual European Safety and Reliability Conference 2012, PSAM11 ESREL 2012

作者： Boercsoek, J. Computer Architecture and System Programming University of Kassel 34121 Kassel Germany

ISBN: (纸本)9781622764365

In Functional Safety it is necessary to calculate safety parameters in order to determine the safety integrity level as well as to determine PFD and MTTF values. Nowadays, several international valid safety standards exist for different user and application areas. In every standard different methods and procedures occur to calculate relevant safety parameters and to determine the failure rates of the components. Those are often only partially comparable. Today, different tools exist to calculate safety loops. However, the models to calculate the parameters are often unknown to the user and therefore it is difficult to state the quality of the solution. This paper discusses these problems and presents a tool, which calculates according the IEC 61508 Ed. 2 standard. This tool is developed in cooperation with a database established by TUV Rheinland, and will give users an advantage in calculating appropriate and reliable parameters.

关键词： Failure rate

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Basic VHDL tests conforming to IEC 61508

Basic VHDL tests conforming to IEC 61508

引用

International Conference on Networked Sensing systems

作者： Hayek, Ali Schreiber, Michael Borcsok, Josef Computer Architecture and System Programming University of Kassel 34121 Kassel Germany

ISBN: (纸本)9781424479108

The development of embedded sensing applications based on integrated circuits leads to ever-growing complexity of VHDL-code and requires sophisticated testability to achieve high diagnostic coverage. The norm IEC 61508 provides a set of requirements for the implementation of safety-related software. This paper deals with the testing of VHDL modules according to IEC 61508. Since VHDL is a hardware description language and differs from traditional software languages, new testing aspects and common coverage criteria are examined with respect to basic needs resulting from those differences. Therefore, a development process according to the V-Model is introduced and a classification of VHDL modules is proposed, providing a basis on which several testing methods and exit-criteria can be evaluated with respect to specific design attributes common for each class. © 2010 IEEE.

关键词： computer hardware description languages

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A filtered tuning method for a GPC controller

A filtered tuning method for a GPC controller

引用

IET Irish Signals and systems Conference, ISSC 2010

作者： Schwarz, M.H. Cox, C.S. Börcsök, J. Department of Computer Architecture and System Programming Safety Computer Technology University of Kassel Kassel Germany Control Systems Centre University of Sunderland Sunderland United Kingdom Department of Computer Architecture and System Programming University of Kassel Kassel Germany

ISBN: (纸本)9781849192521

This paper presents a new tuning method based on model parameters identified in closed-loop. For classical controllers such as PI(D) controllers a large number of simple tuning methods for various application areas exist. However, when it comes to designing a generalised predictive controller (GPC) four parameters have to be specified. To choose those parameters is not a trivial task since they are not directly related to control or regulation performance. The presented tuning method exploits model-parameters to select suitable controller parameters. Additionally, a Rhinehart filter is incorporated in the design to decrease the impact of noise, therefore, a fifth parameter has to be optimised. The proposed method has been tested in simulation and on a real system.

关键词： Controllers

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16th International Conference on computer Graphics, Visualization, computer Vision and Image Processing, CGVCVIP 2022, 8th International Conference on Connected Smart Cities, CSC 2022, 7th International Conference on Big Data Analytics, Data Mining and Computational Intelligence, BigDaCI 2022, and 11th International Conference on Theory and Practice in Modern Computing, TPMC 2022 - Held at the 16th Multi Conference on computer Science and Information systems, MCCSIS 2022

作者： Khattar, Joseph Hahn, Eike Telawi, Samer Schwarz, Michael Boercsoek, Josef ICAS Institute for Computer Architecture and System Programming University of Kassel Kassel Germany

ISBN: (纸本)9789898704429

Recent advancements in the embedded systems field have resulted in more complicated systems with application-specific blocks (IP cores), often known as system on Chip (SoC) devices. Several redundancy-based embedded designs provide reliability and safety for SoC in aeronautics, automotive, industrial automation, railway, and space. In this paper, a Safety system-on-Chip heterogenous1oo2 architecture is presented. The design is based on two open-source and proven in-use cores, LEON3 from Cobham Gaisler and RISCV processors SweRV EH1 from Western Digital. The SoC is implemented on a Xilinx FPGA system and supplemented with conventional peripherals from the Xilinx IP library and Cobham Gaisler. A software comparator is included for a diagnostic. Each core has independent IPs, and the software comparator evaluates data from both cores;in case of deviation, the system is rendered to an energized safe state. © MCCSIS *** rights reserved.

关键词： system-on-chip

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RISC-V Based Safety system-on-Chip with Hardware Comparator 11

RISC-V Based Safety System-on-Chip with Hardware Comparator

引用

11th International Conference on Electronics, Communications and Networks, CECNet 2021

作者： Hahn, Eike Kalinowski, Dominik Mueller, Waldemar Abdelawwad, Mohamed Boercsoek, Josef ICAS Institute for Computer Architecture and System Programming University of Kassel Kassel Germany

ISBN: (纸本)9781643682402

In this paper, a Safety system-on-Chip based on the open-source RISC-V processor SweRV EH1 from Western Digital is presented. A hardware comparator concept is followed. The SSoC is implemented on a Xilinx FPGA system and extended with standard peripherals from the Xilinx IP library and from Cobham Gaisler, so that the overall system has an Ethernet interface in addition to GPIO and UART. The goal is to create a complete redundancy approach with a hardware fault tolerance of nearly 1 from input to output based on the freely available RISC-V instruction set and prove its feasibility. © 2022 The authors and IOS Press.

关键词： system-on-chip

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Influences of attacks on safety related systems

Influences of attacks on safety related systems

引用

23rd International Congress on Condition Monitoring and Diagnostic Engineering Management, COMADEM 2010

作者： Börcsök, J. Ugljesa, E. Dept. of Computer Architecture and System Programming University of Kassel Kassel Germany

ISBN: (纸本)9784883254194

Several standards and guidelines give advice on the development of qualitative and quantitative criteria to evaluate safety related systems, in order to apply these in safety critical applications. These standards don't take into account the possibility of an external attack on the safety related system. In this paper, we will describe the current situation and explore methods and models for security and safety related systems with the help of Markov-models.

关键词： Markov processes

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Different aspects to be considered for safety related development

Different aspects to be considered for safety related develo...

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23rd International Congress on Condition Monitoring and Diagnostic Engineering Management, COMADEM 2010

作者： Schwarz, M.H. Börcsök, J. Dept. Computer Architecture and System Programming University of Kassel Germany Safety Computer Technology University of Kassel Germany

ISBN: (纸本)9784883254194

This paper presents the recent design and development aspects considered within a current project running at the department of computer architecture and system programming. The project "Safety WLAN architectures for safety critical applications related to diagnostic and predictive maintenance possibilities" includes the aspects of diagnostic and predictive maintenance strategies as well as safety related hardware, reliable software design and reliable wireless communication. This paper considers design strategies for the development of reliable, safe sensor systems for process control.

关键词： Software design

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Estimation and evaluation of the 1004-architecture for safety related systems

Estimation and evaluation of the 1004-architecture for safet...

引用

7th International Conference on Electrical and Electronics Engineering, ELECO 2011

作者： Börcsök, Josef Hayek, Ali Computer Architecture and System Programming University of Kassel Wilhelmshöher Allee 71 34121 Kassel Germany

ISBN: (纸本)9786050102048

In the standard IEC 61508 miscellaneous architectures for safety related systems are introduced. Depending on the required safety, reliability and availability levels several architectures such as 1002-, 2002-, 1003-, and 2003-architectures can be selected. In this paper, the concept and calculation of a novel architecture is presented. The 1004-architecture (one out of four) represents an advanced safety architecture, which is 3-failure safe. This means that at least one of the four channels have to work correctly in order to trigger the safety function. In order to classify the quality of the proposed architecture for safety related systems the PFD-value is calculated. Additionally, the Markov-model for a 1004-architecture is introduced and the MTTF-value for this architecture is calculated. The results are high safety and high reliability. © 2011 Chamber of Turkish Electric.

关键词： architecture

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A Tool for reliable model-based design for programming logic controllers

A Tool for reliable model-based design for programming logic...

引用

1st IFAC Workshop on Advances in Control and Automation Theory for Transportation Applications, ACATTA 2013

作者： Schwarz, M.H. Sheng, H. Chaaban, W. Börcsök, J. Dept. Safety Computer Technology University of Kassel Kassel Germany Dept. Computer Architecture and System Programming University of Kassel Kassel Germany

ISBN: (纸本)9783902823519

This paper presents an automated code generation and validation, verification approach to convert model based developments into IEC 61131-3 conform function blocks. IEC 61131-3 programming languages are supported by PLC manufacturers and software environment developers and provide the possibility that novel and intelligent algorithms can be directly operated on industrial accepted systems. Railway and transportation also receive drastic changes from purely hardware based systems to microcontroller + software driven systems. However, the conversion has to follow certain steps to ensure that the adaptation is done correctly and functionality is not alternated, added or deleted. Concepts suggested by different international standards such as the IEC 61508 can help to derive a tool chain to verify the generated code. © IFAC.

关键词： Manufacture

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