Allocating IEC function blocks for parallel real-time distributed control system

Real-time distributed control systems (RDCSs) have an increasing importance in industrial process. The evolving standard IEC 61499 provides function block (FB) as a suitable metaphor for constructing RDCSs. However, the real-timeliness of such systems has not been well dealt with. From a real-time p...

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Vydáno v:2004 IEEE International Conference on Control Applications Ročník 1; s. 254 - 259 Vol.1
Hlavní autoři: Feng Xia, Zhi Wang, Youxian Sun
Médium: Konferenční příspěvek
Jazyk:angličtina
Vydáno: Piscataway NJ IEEE 2004
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ISBN:9780780386334, 0780386337
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Abstract Real-time distributed control systems (RDCSs) have an increasing importance in industrial process. The evolving standard IEC 61499 provides function block (FB) as a suitable metaphor for constructing RDCSs. However, the real-timeliness of such systems has not been well dealt with. From a real-time point of view, the FB model defined in IEC 61499 is extended with several timing characteristics. Task graph (TG) is employed to represent FB based RDCS. By exploiting the benefits of parallelism, pipeline scheduling, which can greatly shorten the control period, is utilized for real-time FBs. The problem of allocating FBs to parallel RDCSs subject to periodicity, time, precedence as well as resource constraints is examined. A heuristic algorithm is proposed to further decrease the minimum of control period while meeting these constraints, thus improving the quality of control (QoC). An illustrative example is presented, highlighting the advantages of the proposed method.
AbstractList Real-time distributed control systems (RDCSs) have an increasing importance in industrial process. The evolving standard IEC 61499 provides function block (FB) as a suitable metaphor for constructing RDCSs. However, the real-timeliness of such systems has not been well dealt with. From a real-time point of view, the FB model defined in IEC 61499 is extended with several timing characteristics. Task graph (TG) is employed to represent FB based RDCS. By exploiting the benefits of parallelism, pipeline scheduling, which can greatly shorten the control period, is utilized for real-time FBs. The problem of allocating FBs to parallel RDCSs subject to periodicity, time, precedence as well as resource constraints is examined. A heuristic algorithm is proposed to further decrease the minimum of control period while meeting these constraints, thus improving the quality of control (QoC). An illustrative example is presented, highlighting the advantages of the proposed method.
Author Feng Xia
Youxian Sun
Zhi Wang
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  organization: Nat. Lab. of Ind. Control. Technol., Zhejiang Univ., Hangzhou, China
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Keywords Function block diagram
Periodicity
Scheduling
Distributed system
Real time
Modeling
Metaphor
Pipeline
Real function
Quality control
Heuristic method
Distributed control
Parallelism
Timing
Language English
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Snippet Real-time distributed control systems (RDCSs) have an increasing importance in industrial process. The evolving standard IEC 61499 provides function block (FB)...
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StartPage 254
SubjectTerms Applied sciences
Computer science; control theory; systems
Control theory. Systems
Distributed control
Electrical equipment industry
Exact sciences and technology
Heuristic algorithms
IEC standards
Industrial control
Job shop scheduling
Pipelines
Real time systems
Resource management
Timing
Title Allocating IEC function blocks for parallel real-time distributed control system
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