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1989 A First International Conference on the Use of Programmable Electronic Systems in Safety Related Applications Computers and Safety

8-10 Nov 1989

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Displaying Results 1 - 23 of 23
  • Proposed HSE guidelines on emergency shutdown systems

    Publication Year: 1989, Page(s):55 - 58
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (196 KB)

    Modern programmable systems offer extremely high levels of reliability but require an appropriate level of attention to detail during design, manufacture, commissioning and operation to ensure high systematic integrity. The reliability of sensors and actuators on which emergency shutdown (ESD) systems depend entirely for safe plant operation will continue to be a limiting factor to the overall lev... View full abstract»

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  • Safety related instrument systems for the process industries

    Publication Year: 1989, Page(s):41 - 43
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (156 KB)

    Self acting mechanical devices or systems may not be adequate in all cases to prevent hazards on process plants or may not be economically viable. Under these circumstances non-self-acting systems may be used as the primary protection against dangers to personnel. The Health and Safety Executive in 1987 published general guidelines on programmable electronic systems in safety-related applications.... View full abstract»

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  • Defence standards 00-55 and 00-56

    Publication Year: 1989, Page(s):103 - 105
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (224 KB)

    The UK Ministry of Defence (MOD) has been developing standards for the procurement of safety critical systems, including those containing computer software. This article outlines the procurement and technical considerations for this work, and details some of the problems encountered View full abstract»

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  • Reliability of computer based safety systems

    Publication Year: 1989, Page(s):8 - 12
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (300 KB)

    Safety systems are installed in various industries to prevent undesirable events and to minimize the adverse effects of such events if they occur. Because of their nature, safety systems must be highly reliable. From a safety point of view, the probability of responding to a shutdown demand must be high (have a high safety availability). For economic reasons, the production shutdowns caused by saf... View full abstract»

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  • The use of safety related control systems in primary mine ventilation circulation

    Publication Year: 1989, Page(s):49 - 54
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (388 KB)

    A description is given of a ventilation problem at a large underground coal mine. The limitation of conventional solutions is discussed, along with the proposed solution using an underground recirculation fan in the primary mine ventilation system. Foreseeable potential hazards associated with the proposals are identified. The authors describe the need for emergency shutdown of the recirculation f... View full abstract»

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  • Programmable electronic systems in safety related lift applications

    Publication Year: 1989, Page(s):36 - 40
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (248 KB)

    With the advent of programmable electronic systems (PESs) or computers, in safety related lift systems, need has arisen to clarify those areas covered by the `safety rules for the construction of lifts', where PESs may or may not, be applied. The article is based on the guidelines prepared by the National Association of Lift Makers. The guidance applies if one or more of the safety related systems... View full abstract»

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  • The assessment of PESs in safety related applications: an update

    Publication Year: 1989, Page(s):67 - 69
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (276 KB)

    A number of assessments of major industrial installations incorporating programmable electronic systems (PES) have been carried out in recent years, some of these being on PESs which were used in safety related applications. This paper identifies the reasons why the author believes that the assessment of PESs is essential in safety related applications. Three methods of assessment are identified, ... View full abstract»

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  • Dependable systems using `VIPER'

    Publication Year: 1989, Page(s):23 - 27
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (340 KB)

    VIPER is a 32-bit reduced instruction set microprocessor which has been specified, designed, and verified using the most formal techniques available. A complete chain of proof exists between the various gate-level designs and the functional specification. VIPERs are designed to work in pairs, to form fault-detecting computing modules with virtually 100% cover against single faults. All the compari... View full abstract»

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  • Assessment of real-time software-a review

    Publication Year: 1989, Page(s):80 - 85
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (532 KB)

    In computer control situations, one is dealing with the use of real-time software-programs which are not the same as conventional data-processing-type programs. The most important aspect of real-time software is that in most cases, the system inputs are not fixed in time and (normally) cannot be predicted in value. Another important characteristic is that normally such real-time computer systems a... View full abstract»

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  • 1192: implications for safety in machinery control systems

    Publication Year: 1989, Page(s):97 - 102
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (316 KB)

    Integrity assessment in complex control systems demands a logical approach, and in the international and European standardisation organisations, technical committees and working groups are beavering away to create guidance on the standards to be achieved. The creation of the Machinery Directive and its contribution towards achieving the single European market by the end of 1992 has significantly i... View full abstract»

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  • System configurations [safety systems]

    Publication Year: 1989, Page(s):1 - 7
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (216 KB)

    A discussion is given on hardware aspects of the system configuration of safety systems. When considering the configuration it is essential to include everything that is related to the safety system and not just the programmable part. The total configuration of safety related systems may include other electrical or electronic systems, mechanical or pneumatic equipment or possibly actions of the op... View full abstract»

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  • Design of fail safe computer systems for railway control

    Publication Year: 1989, Page(s):59 - 61
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (180 KB)

    In the last ten years, control computers have been introduced for railway control in Poland. The previous, relay versions of railway control systems have good safety measures derived directly from reliability theory because the base element of such systems-an electromagnetic relay-has nonsymmetrical faults and appropriate fail-safe rules of design may be applied. Typical digital circuits in electr... View full abstract»

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  • Application of OH180 programmable controllers to safety related systems at the Darlington nuclear generating station

    Publication Year: 1989, Page(s):44 - 48
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (332 KB)

    Darlington nuclear generating station, one or North America's largest energy projects, is being built by Ontario Hydro. As with any major complex plant, many different forms of control are utilized, from major computer systems to local mechanical relays and many variations in including the OH180 programmable controller (PC). The author looks at some of these control methods but focuses on the OH18... View full abstract»

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  • The march towards standards in safety related systems

    Publication Year: 1989, Page(s):106 - 110
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (224 KB)

    This paper demonstrates that the development of safety-related software and systems needs additional levels of skill to other types of systems. There are international standards being developed to aid the developer and there are cost-effective methods of testing and assessing the safety without the recourse to formal mathematical methods in every case. Both these developments are explored View full abstract»

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  • A framework for achieving safety-integrity in software

    Publication Year: 1989, Page(s):13 - 17
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (236 KB)

    Computer-controlled plants and equipment are becoming increasingly important in the quest for greater efficiency and profitability in UK industry. Computers (or the more generic term used by HSE-programmable electronic systems (PES)) offer potential advantages to safety by, for example, providing better information about potential dangerous situations before they occur on a plant. However the soph... View full abstract»

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  • Integrity levels and assessment levels in practice

    Publication Year: 1989, Page(s):70 - 74
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (236 KB)

    Addresses the problems associated with the practical aspects of developing and assessing software used in safety related and safety critical applications. Many of these problems are common to other applications where high quality software is required. The authors consider the problems which are specific to safety critical applications. Nevertheless, many of the methods and techniques proposed are ... View full abstract»

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  • Programmable safety related systems in the gas industry

    Publication Year: 1989, Page(s):28 - 35
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (348 KB)

    Real-time programmable electronic systems (PESs) are discussed and specific difficulties associated with their failure when used as safety systems are described. The Health and Safety Executive (HSE) guidance is summarised and the authors describe how the Institution of Gas Engineers (IGE) guidance document has been developed, taking account of British Gas experience, to provide application specif... View full abstract»

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  • Formal methods for railway signalling

    Publication Year: 1989, Page(s):86 - 91
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (280 KB)

    At the moment, railway signalling systems are designed in a manner which is based on concepts of interlocking and signalling which have grown up over the last 150 years. Considerable use is made of `relay diagrams' and tables to define interlocking and routing. The excellent safety record of railways worldwide is due to a large extent to the rigour of the regulations which have been evolved by gen... View full abstract»

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  • The assessment of low-cost safety-critical microelectronics

    Publication Year: 1989, Page(s):62 - 66
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (360 KB)

    The costs of approval testing, safety-critical microelectronics can be reduced by: (i) using automatic test procedures as much as possible for the quantitative part of the approval testing procedure; (ii) initiating the approval procedure at the earliest possible stage in the development; (iii) assessing the system configuration in close cooperation with the design engineer, who has to `defend' hi... View full abstract»

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  • Computers and Safety. A First International Conference on the Use of Programmable Electronic Systems in Safety Related Applications (Conf. Publ. No.314)

    Publication Year: 1989
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (24 KB)

    The following topics were dealt with: safety systems and software; sector guidance; safety-related systems applications in control systems for engineering; assessment of programmable electronic systems in safety related applications; formal methods in safety systems; and safety standards View full abstract»

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  • Software fault tolerance for a flight control system

    Publication Year: 1989, Page(s):18 - 22
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (344 KB)

    The aim of software fault tolerance is to introduce programming techniques which will allow the embedded software to maintain performance in the presence of hardware faults which include data, address and control bus corruptions. A case study is described in which the navigation and control software of a remotely piloted vehicle (RPV) is subjected to such transient fault conditions. The embedded s... View full abstract»

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  • User-centred design of a computer-based control and surveillance system for nuclear power plant

    Publication Year: 1989, Page(s):75 - 79
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (392 KB)

    A design and development programme for a future monitoring and control system applied to a small, high-integrity nuclear reactor is postulated. An overview is given of a user-centred approach to the design, from initial conceptual studies to full-scope simulation. The approach allows due consideration to be given to the use of human factors techniques, and use of computer aided design tools in the... View full abstract»

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  • Safety critical software in control systems-a project view

    Publication Year: 1989, Page(s):92 - 96
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (280 KB)

    Rolls-Royce and Associates have designed plant which incorporates microprocessor based systems, including software, which control operations critical to the plants safety. It has therefore been necessary both to develop software in such a way as to ensure its correct operation, and then to further demonstrate that this objective has been achieved. From this basis a revised set of software developm... View full abstract»

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