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Control Systems Software Reliability for Industrial Applications, IEE Colloquium on

Date 6 Oct 1989

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Displaying Results 1 - 8 of 8
  • Experiences assessing high integrity software

    Publication Year: 1989 , Page(s): 2/1 - 2/3
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (140 KB)  

    The author presents the methodology called RISCS (Reliability, Integrity and Safety Critical Studies) developed by CSE for assessing the safety and reliability of the computer-based control systems. The methodology permits differing hazards of the system to be assessed at differing levels, making use of the most powerful assessment techniques available. RISCS assesses the reliability, system integrity and safety in the context of the complete system and not just the software, though this is an important part of the assessment. What is more the client is able to decide on the level of assessment required. The RISCS approach consists of a number of consecutive stages: hazard criteria selection, legal/economic consideration, determination of assessment level, selection of assessment, and evaluation View full abstract»

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  • Gas transmission system software integrity

    Publication Year: 1989 , Page(s): 7/1 - 7/6
    Cited by:  Patents (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (236 KB)  

    Considers two gas transmission stations at either end of the pipeline sited in areas of different population density, this would mean that different pressure constraints would be placed upon them. The solution currently used in the gas industry is to control the outlet pressure of the up stream station, to a value which could exceed 100 lbf/in2. The up stream pressure is modulated by a programmable process controller. The control system and its software maximises the pressure inside the population boundary, but also ensures that the pressure inside the boundary does not exceed 100 lbf/in2 , even at times of low demand when a small pipeline pressure drop occurs. In the software of the process controller is a pipeline model which will calculate the measured variable i.e. the down stream station pressure. The system software is used to improve the accuracy and integrity of the actual and calculated measured variable View full abstract»

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  • The role of CUTLASS in software reliability

    Publication Year: 1989 , Page(s): 1/1 - 1/3
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (132 KB)  

    Describes the approach taken within the CEGB to control system software reliability in major control and instrumentation refurbishments in power stations. The CEGB has adopted a policy of using a real-time software system developed in-house to cater for computer control, plant monitoring and operator displays in power stations. This is known as CUTLASS (Computer User's Technical Language And Software System). Within PowerGen there are approximately 300 CUTLASS control computers (targets) undertaking primarily boiler control. The means adopted within CUTLASS to provide reliability in two aspects are described: the software must work as intended, and it must behave correctly in a control sense. Means to protect the plant against both hardware and software failures are also briefly described View full abstract»

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  • Specification and verification of the real-time synchronisation software for a modular independently driven high-speed machine

    Publication Year: 1989 , Page(s): 6/1 - 6/4
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (180 KB)  

    Describes research into the design of real-time synchronisation software for a high-speed packaging machine utilising independent drives. The machine is of a novel modular design which exploits the flexibility that is introduced by the use of software controlled independent drives. It is intended for use in flexible manufacturing applications in which large quantities of various products are produced by one high-speed machine. The research involved the specification of the control and synchronisation requirements of the machine using a concurrent language and the design and implementation of a transputer-based distributed control system capable of high-speed performance. This involved software design using the concurrent programming language Occam and software modelling and verification using Petri-nets View full abstract»

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  • IEE Colloquium on `Control Systems Software Reliability for Industrial Applications' (Digest No.111)

    Publication Year: 1989
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (24 KB)  

    The following topics were dealt with: power station computer control; CUTLASS; software reliability; integrity software assessment; fault tolerant controllers; self tuning PI controllers; quality software; synchronisation software specification and verification; packaging machines; and gas transmission system software integrity View full abstract»

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  • Fault tolerance for microprocessor-based controllers susceptible to transient disturbances

    Publication Year: 1989 , Page(s): 3/1 - 3/3
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (160 KB)  

    Outlines the design of a microprocessor based controller with fault tolerance from transient disturbances. Such events can cause erroneous jumps within executing software. Fault tolerance is achieved through automatic enhancement of the application software. Performance issues are briefly discussed View full abstract»

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  • Quality software

    Publication Year: 1989 , Page(s): 5/1 - 5/4
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (204 KB)  

    Addresses the problem of developing quality software, specifically in industrial applications. Both the market needs and the motivation exist for higher quality software. After identifying these driving forces, an attempt is made to define software quality. The author goes on to discuss ways that the quality of software produced can be improved using contemporary methods. It is concluded that the answer may lie in the application of resilient hardware design principles, not to the software, but to the development process itself View full abstract»

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  • Reliability aspects of algorithms for industrial self-tuning P+I controllers

    Publication Year: 1989 , Page(s): 4/1 - 4/8
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (224 KB)  

    Describes the family of self-tuning PI controllers proposed for distribution within the Bristol Babcock range of programmable industrial controllers. The algorithms include a `one-shot' closed-loop cycling procedure, a pattern recognition adaptive strategy and a recursive least squares based scheme. The paper details those refinements appended to the basic algorithms to ensure reliable operation under adverse conditions such as noise, load disturbances or non-minimum phase behaviour, and those features of the algorithms which ensure that operation always lies within safe plant operating limits, even when used by unskilled or inexperienced personnel View full abstract»

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