A study of current logic design practices in the automotive manufacturing industry

Lucas, M.R.; Tilbury, Dawn M.

doi:10.1016/s1071-5819(03)00115-0

Cited by 47 publications

(22 citation statements)

References 21 publications

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“…Understanding the current process will demonstrate the nature of the current problem, and allow future researchers to better match a solution with the problem. This work has begun in [27].…”

Section: Discussionmentioning

confidence: 99%

Methods of measuring the size and complexity of PLC programs in different logic control design methodologies

Lucas

Tilbury

2005

Int J Adv Manuf Technol

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Currently there is a wide variety of logic control design methodologies used in industrial logic design. These methodologies include ladder diagrams, function block diagrams, sequential function charts, and flow charts, but driven by a desire for verifiability, academics are developing additional logic control design methodologies, such as modular finite state machines and Petri nets. Using these, important properties of programs can be verified and some logic can be generated automatically from a part plan. The main contribution of this paper is to define methods for measuring programs written in different methodologies, so that the performance of the methodologies can be compared.We demonstrate these methods of measurement using four program samples that perform similar functions on the same machine, written in four logic control design methodologies: ladder diagrams, Petri nets, signal interpreted Petri nets and modular finite state machines.

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Section: Discussionmentioning

confidence: 99%

Methods of measuring the size and complexity of PLC programs in different logic control design methodologies

Lucas

Tilbury

2005

Int J Adv Manuf Technol

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“…For error handling, if an abnormal event is detected during an operation, the cell controller should identify which operation is in error and stop that operation, and then interact with human operator to recover from the error and allow production in the cell to continue. The control logic to create the normal operation control is generally reported to be about 10% of the total, while the logic for error handling is far beyond that portion of the total (Lucas and Tilbury 2003). To reduce the amount of time required for debugging control logic, this paper presents a control design method that prevents control engineers from including the following undesirable control behaviors in the control logic:…”

Section: Challenges In Cell Controller Developmentmentioning

confidence: 99%

“…However, the traditional development procedure of the cell controller relies heavily on the experience of experts and is not well structured (Lucas and Tilbury 2003). Commercial software can help develop controllers for flexible systems, but do not enable formal verification (Richardsson 2002).…”

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confidence: 99%

A modular control design method for a flexible manufacturing cell including error handling

Lee

Tilbury

2007

Int J Flex Manuf Syst

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This paper introduces a new modular control design method for a cell controller with integrated error handling. To make the complexity of the cell controller manageable, its control logic is separated into two parts: resource allocation control and operation control. To create the operation control not only quickly but correctly, modular operation blocks integrated with error handling are developed. An algorithm automatically generates the operation control. The operation control created by the proposed method is proved to have desired control behaviors. The method is applied to an example system.

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“…Unfortunately though, today there is still a big gap between the theory and its application in the industry in spite of what the discrete event community would had expected fifteen years ago. In [2] the authors show how at the present the majority of industrial control programs for manufacturing system are obtained manually, relying on the reuse of hand written logic from previous projects, due to the similarity of the equipments to control and their behavioral requirements. In spite of the currently competitiveness, this strategy is not going to be compatible with the incoming safety requirements for the industry installations.…”

Section: Introductionmentioning

confidence: 99%

Reactive control system design using the Supervisory Control Theory: Evaluation of possibilities and limits

Cantarelli

Roussel

2008

2008 9th International Workshop on Discrete Event Systems

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Abstract-This paper presents a method to obtain programs to control an industrial equipment using the Supervisory Control Theory (SCT). The presented approach is based on high detailed Process models. A model of the interactions between the Control Unit and the Process is also included in the Plant model to facilitate the extraction of the Controller behavior from the Supervisor. An approach to obtain from the Supervisor a Controller straightforwardly implementable and then to automatically generate the Control Unit program is provided. The method presented in this paper has been tested on several case studies (from Specifications to test with a real Process). A dimensional summary of two of them is presented in the last section.

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A study of current logic design practices in the automotive manufacturing industry

Cited by 47 publications

References 21 publications

Methods of measuring the size and complexity of PLC programs in different logic control design methodologies

Methods of measuring the size and complexity of PLC programs in different logic control design methodologies

A modular control design method for a flexible manufacturing cell including error handling

Reactive control system design using the Supervisory Control Theory: Evaluation of possibilities and limits

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