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Author: search.filters.author.Sangsuwan, ThaksinSubject: search.filters.subject.Communication schedule

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    Item type:Publication,
    Communication schedule optimization for foundation fieldbus H1 segment with dual cascade control loops
    (2016-11-01)
    Sangsuwan, Thaksin
    ;
    Pongswatd, Sawai
    ;
    Julsereewong, Amphawan
    This paper proposes a method for optimizing communication schedules of dual cascade control loops within the same Foundation Fieldbus (FF) H1 segment. Integrated Harmonas-DEO host system is utilized as a configuration tool for building control strategy and scheduling macrocycle of the studied H1 segment, which consists of two level-to-flow cascade control loops. Communication schedule optimization of two different cases of assigning control functions to run in the field devices is described. Method validation is based on the use of three metrics: latency improvement, publication gap improvement, and macrocycle utilization improvement. Comparison results between the natural macrocycle and optimized macrocycle show that the proposed method can improve not only the latency of control loop but also the availability of communication bandwidth.
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    Communication schedule optimization of cascade control using foundation fieldbus
    (2016-01-01)
    Sangsuwan, Thaksin
    ;
    Pongswatd, Sawai
    ;
    Julsereewong, Amphawan
    ;
    Morioka, Yoshitsugu
    ;
    Amano, Yoshiharu
    This paper presents a technique to optimize the communication schedules generated for synchronization of Foundation Fieldbus H1 devices in cascade control loop. A level-to-flow cascade control operated by the Harmonas-DEO host system is examined as an illustrative case study. Major objectives of the optimization are not only to minimize the latency of the control loop but also to maximize the availability of the network bandwidth. The proposed technique can be applied for H1 segment macrocycle schedules performing the control functions in both of the host controller and the field devices. Three examples for optimizing communication schedules generated from different control block assignments are described. The validation of the optimization methods can be determined by using two metrics: control loop latency improvement and publication gap availability improvement. Experimental results confirm that the proposed technique works effectively to operate the studied H1 segment for cascade control without any problems.