It was shown in former publications that, in principle, the design of a distributedcontrol system according to IEC 61499 could be proven to be correct. An implementation of such a control system should run correctly....
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ISBN:
(纸本)9781424468508
It was shown in former publications that, in principle, the design of a distributedcontrol system according to IEC 61499 could be proven to be correct. An implementation of such a control system should run correctly. But there are known issues regarding the specification and implementation of IEC 61499 function blocks execution models, which cause a verified control system design does not necessarily resulting in an implementation with the desired behavior. Another issue influencing the verification process is the granularity of the formal models used for verification. Bringing more plant properties (i.e. time related) into formal models for closed-loop verification will improve the verification process and reliability in its result. In this contribution the authors want to draft a way of covering the above-mentioned issues using the known Net Condition/Event systems (NCES) as formal models.
New technologies and standards are emerging that are set to have a dramatic effect on the design and implementation of industrial controlsystems. These technologies will reduce the time to bring new systems on stream...
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New technologies and standards are emerging that are set to have a dramatic effect on the design and implementation of industrial controlsystems. These technologies will reduce the time to bring new systems on stream, and leverage the integration of business and industrial systems. The fusion of distributed object technology, with function blocks as defined in the new IEC standard 1499, will allow distributed industrial controlsystems to be created by the interconnection of software components.
The IEC 61499 Function Block architecture is considered as the next generation of programmable control technology promoting distributedcontrol in automation. In this paper, the redesign methodologies from the PLC con...
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The IEC 61499 Function Block architecture is considered as the next generation of programmable control technology promoting distributedcontrol in automation. In this paper, the redesign methodologies from the PLC control to the event-driven architecture of IEC 61499 function blocks are proposed. A general set of translation steps and mapping rules for redesigning applications from IEC 61131-3 PLC to IEC 61499 Function Blocks is provided. Three different redesign approaches are proposed: object-oriented conversion approach, object-oriented reuse approach, and class-oriented approach. These approaches are to be applied for different design styles of the source PLC code. The data handling efficiency of all approaches is investigated. An airport baggage handling system is chosen as the case study for the redesign process. The rules and limitations are summarized and guidelines for the redesign process are provided. Note to Practitioners-This paper is motivated by the issue of insufficient PLC performance in an airport baggage handling system. When trying to deploy distributedcontrol to PLC based baggage handling systems and provide intelligence to each PLC for sorting bags and malfunction detection, the efficiency and performance problems occur. Also, the PLC is not capable of reconfiguring the program during the operation. The performance of data update on a fieldbus deteriorates when more PLCs are connected to it. This paper suggests to use IEC 61499 standard and distributedcontrol to solve those problems and proposes a way to migrate to IEC 61499 from IEC 61131-3 PLCs. By applying the proposed object-oriented and class-oriented design patterns for combining IEC 61499 with IEC 61131-3, the migration of centrally controlled baggage handling systems to distributedcontrolsystems is feasible. In this paper, we present a general translation methodology for both object-oriented and class-oriented approaches. Also, the data handling efficiency over the distributed contr
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