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Author: search.filters.author.Julsereewong, AmphawanSubject: search.filters.subject.Control in the host

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    Item type:Publication,
    Comparative analysis between control in the host and control in the field in terms of safety and availability for foundation fieldbus-based process control
    (2018-04-01)
    Julsereewong, Amphawan
    ;
    Whatphat, Nopthawach
    ;
    Sangsuwan, Thaksin
    ;
    Chanwutitum, Jirasak
    ;
    Thepmanee, Teerawat
    Design work of process control to provide necessary performance requirements must be based on capabilities and limitations of the technology used. This paper aims at analyzing possible safety and availability enhancements of basic process control based on Foundation Fieldbus (FF) technology in which the control function blocks can be assigned either in the host system controller, called ‘Control in the Host’ (CIH), or in the field devices, called ‘Control in the Field’ (CIF). Implementing the control loops with CIH and CIF strategies for water tank process is utilized as a case study to demonstrate the proposed analysis. The major configuration details of field devices, control strategies, and function blocks are described. Experimental results were analyzed for examining the parameter options as well as the control loop actions in response to invalid measurements to compare the safety and availability improvements between the CIH and the CIF. The proposed analysis can be useful to enable economical solutions for design phase of the FF-based control loops.
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    Foundation Fieldbus segment scheduling for fast loop controls
    (2013-02-15)
    Julsereewong, Amphawan
    ;
    Julsereewong, Prasit
    ;
    Harntujit, Piyaporn
    In this article, a technique to obtain fast loop controls using Foundation Fieldbus-based control in the field strategy is presented. Macrocycle schedules for running a single control loop and running two control loops on a segment are examined. Performances of the proposed technique were studied through calculated macrocycle timing schedules produced by the DeltaV and CentumVP systems. Surpassing the traditional Distributed Control System (DCS) approach with control in the host, the proposed technique offers significant improvement in segment schedules with minimizing network scheduled communications. © 2013 ICIC International.