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Author: search.filters.author.Julsereewong, AmphawanSubject: search.filters.subject.Programmable logic controller

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    Hybrid Posi cast - based PID - PDA Control Using System Identification for Continuous Tunnel Kilns
    (2026-06-30)
    Pannil, Pittaya
    ;
    Sungsorn, Teenapong
    ;
    Trisuwannawat, Thanit
    ;
    Julsereewong, Amphawan
    ;
    Thepmanee, Teerawat
    This paper proposes a hybrid Posicast-based proportional-integral-derivative with proportional-derivative-acceleration (PID-PDA) controller for temperature regulation in delay-dominant continuous tunnel kilns. The controller is developed based on a system-identified second-order-plus-dead-time (SOPDT) model derived from industrial data and implemented in discrete time for programmable logic controllers (PLCs). A unified framework enables comparison with a standard PLC-based proportional-integral (PI) controller, an internal model control (IMC)-tuned PI controller, and a Smith Predictor-PI controller under identical conditions. Simulation results demonstrate faster response, negligible overshoot, and reduced tracking error, with improved settling time and lower, integral of absolute error (IAE), integral of squared error (ISE), and integral of time-weighted absolute error (ITAE), while maintaining comparable control effort. Robustness analysis confirms stable performance under plant perturbations, with IAE variations within approximately ± 10 (servo) and ± 1 (disturbance). The controller is validated on an Allen-Bradley PLC in a silicon controlled rectifier (SCR)-based heating system. Experimental results show improved steady-state performance, including reduced bias, lower mean absolute error (MAE) and root mean squared error (RMSE), reduced oscillation amplitude, and compliance within the ± 1 temperature band. The proposed approach provides a practical, robust, and high-performance solution for upgrading existing PLC-based systems without hardware modifications.
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    Toward Interoperable SCADA: Node-RED-Based Edge Integration of Heterogeneous PLCs and IoT Devices
    (2025-01-01)
    Smerpitak, Krit
    ;
    Kaewchaiwong, Sattachai
    ;
    Ukakimaparn, Prapart
    ;
    Julsereewong, Amphawan
    ;
    Pongswatd, Sawai
    This article presents a novel approach to supervisory control and data acquisition (SCADA) design that emphasizes interoperability through edge integration, using Node-RED as an open-source programming platform deployed on an industrial edge computer. The proposed architecture integrates multiple-vendor programmable logic controllers (PLCs) and an Internet of Things (IoT) gateway at the edge layer to enable seamless interoperability across local control systems. A lab-scale case study demonstrates the feasibility of this integration, featuring four remote terminal units (RTUs) communicating concurrently with a SIMATIC IPC327G edge computer via standard protocols. Specifically, a SIMATIC S7-1200 (RTU-1), MELSEC iQ-F FX5U (RTU-2), and CompactLogix 1769-L30ER (RTU-3) control an object sorting station, a parcel sorting station, a water temperature control station, respectively, while a UG65 gateway (RTU-4) enables bidirectional data transfer between the edge computer and LoRaWAN devices. The inclusion of InfluxDB alongside Node-RED supports data logging and reporting functionalities. By distributing protocol translation, data processing, and shop-floor supervisory control to the edge layer, the architecture achieves real-time, vendor-neutral data orchestration while maintaining compatibility with a higher-level SCADA master terminal unit (MTU) or cloud system. Experimental results from both functional and performance testing confirm the system’s viability as a cost-effective, vendor-agnostic solution for modern industrial automation, offering a scalable model for multi-protocol industrial environments.
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    Simplified and systematic plc programming technique: A case study of burner control for thermal oil heater
    (2015-01-01)
    Khaefoi, Supakit
    ;
    Smerpitak, Krit
    ;
    Pongswatd, Sawai
    ;
    Julsereewong, Amphawan
    This article presents a technique to simplify and systematize programmable logic controller (PLC) programming for ease of engineering. A PLC-based burner control for thermal oil heater is examined as an illustrative case study. Based on the proposed method, two example cases of PLC programming for the modified burner control by adding input devices and alarm and shutdown conditions are described. Performance of the proposed technique is demonstrated through experimental tests done by nine engineers with difference experiences for ladder-logic-based PLC programming. Experimental results show that the proposed technique provides ease of reusing and modifying the existing ladder logic code and saving of time for writing the programs.