Julsereewong, Amphawan

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Preferred name
Julsereewong, Amphawan
Alternative Name
Julsereewong, A.
Main Affiliation
Email
amphawan.ju@kmitl.ac.th

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    Item type:Publication,
    Safety and availability of basic process control using foundation fieldbus with control in the field - An experimental analysis
    (2017-08-01)
    Sangsuwan, Thaksin
    ;
    Thepmanee, Teerawat
    ;
    Julsereewong, Amphawan
    Detailed knowledge of how to balance between safety and availability for instruments is essential to successful design and implementation in fieldbus-based process control systems. The configuration correctness is crucial to actually obtain the benefits of digital fieldbus technology used. In actuality, a number of device parameters must be set to provide the required functionalities. This paper focuses on improving safety and availability for the proportional-integral-derivative (PID) and cascade control strategies using Foundation Fieldbus (FF) with control in the field. The aim of this paper is to analyze the logical behaviors of PID and cascade loops in two conflicting purposes for studying how different configuration options affect the interlocks between function blocks located in instruments as well as the initialization and fail-safe mechanisms in response to invalid measurements. For safety purpose, the interested control loops are configured to bring the process to a safe state in the presence of a fault. For availability purpose, the interested control loops are configured to keep the process running in the event of a failure. A water tank process is utilized as a case study for control loop implementations. Interactions between the status propagation and mode shedding for demonstrating the studied control loop behaviors are examined experimentally in Petri net models. In addition, the function block options for bumpless transfer and setpoint tracking are also described. The proved configuration method for proper operations in balancing the interests of safety and availability is proposed.
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    Item type:Publication,
    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.