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Hybrid Posi cast - based PID - PDA Control Using System Identification for Continuous Tunnel Kilns
(2026-06-30)
Pannil, Pittaya
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Sungsorn, Teenapong
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Trisuwannawat, Thanit
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Julsereewong, Amphawan
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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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Development of Remote Laboratory for Feedback Control System Class
(2021-01-01)
Jitthammapirom, Piya
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Chayratsami, Pornpimon
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Somha, Worawit
This research presents a low cost web-based remote laboratory system for a feedback control system class. The system is created by an inexpensive single-board computer (Raspberry Pi 3B+) as laboratory server, an edge of extinct Lego Mindstorms set as a controlled plant, and an IP camera system. The laboratory server based on Ubuntu, which is a free and open-source software and the web application is written with JavaScript based on a MEAN stack platform. The proposed laboratory is used for verifying a design project of the angle control system using Proportional-Integral-Derivative (PID) control.
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Wincc-based process simulation for virtual commissioning of scada system integration
(2020-01-01)
Thepmanee, Teerawat
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Tantaweenulak, Adisak
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Smerpitak, Krit
In order to provide possibility for system integrators to verify the correctness and effectiveness of functions of a supervisory control and data acquisition (SCADA) system before on-site installation and actual commissioning, this paper presents a process simulation based on software-in-the-loop technique by using VBScript in WinCC for virtual commissioning. Design of integrating an existing control loop in water tank process of pharmaceutical manufacturing plant into a new SCADA is used as a case study. The interested process, which consists of inlet water pump, inlet control valve, level transmitter, and outlet water pump, is controlled by proportional-integral-derivative (PID) algorithm in a programmable logic controller (PLC) to maintain hydrostatic pressure in the water tank. Operations of the simulated process can be controlled in either manual mode or automatic mode. Moreover, the proposed simulation provides an option to imitate device failures that could not be done in real process due to damages for ensuring SCADA fault notification based on failure modes and effects analysis (FMEA). Experimental results of using the proposed process simulation for testing whether the created human machine interface (HMI) screens of the SCADA system integration fulfill functional design specifications are also included.
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Hmi implementation using radar chart for dual-loop system
(2019-08-01)
Pongswatd, Sawai
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Smerpitak, Krit
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Kummool, Sart
This article presents a method to implement the Human Machine Inter-face (HMI) for providing high visibility of dual-loop system to encourage good operations and maintenance practices. The proposed method is based on the employment of radar chart to display key performance metrics of simultaneous and independent control of two identical loops for extensive event monitoring. Two level control loops utilizing two Proportional-Integral-Derivative (PID) function blocks of a single Programmable Logic Controller (PLC) are used as the case study to show the workability of the proposed HMI implementation. Each loop consists of a transmitter for measuring the controlled level an inverter for inverting the PLC output to adjust a pump speed, and a power meter form easuring the pump power consumption. The transmitter outputs from both control loops are applied to the PLC analog input module, and then separately scaled to be available to each PID block. The PLC analog output module is used to pass the PID block outputs for manipulating inlet flow rates. The performance metrics including the set point, process variable, manipulated variable, and pump power consumption of both control loops are detected and collected by the HMI/Supervisory Control and Data Acquisition (SCADA)station. All detected data of four performance metrics are represented on the axes of radar chart in real time by using the Wonder ware In Touch software. The script functions to save and load the specified data to the SQL server database are also created on the HMI/SCADA station. Experimental results confirm that the proposed HMI implementation can function correctly.
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The Walking Assistance System using the Lower Limb Exoskeleton Suit Commanded by Backpropagation Neural Network
(2019-01-10)
Karantarat, Obnithi
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Kitjaidure, Yuttana
Currently there are many elderly people who have walking problems. This paper aims to develop and solve these problems by introducing walking assistance system which can recognize 3 types of gestures, include walking, sitting and standing. Our system is divided into 3 main parts including Feature extraction which consists of Time domain and Frequency domain, Classification and Exoskeleton suit system. Conjugate Gradient Backpropagation Neural Network is used to classify sEMG signal of lower limb posture after extracted the features. Then the output of classification is used to command the Exoskeleton suit to perform the gesture according to the results of the recognition. In addition, our paper uses PID controller to control DC motor of Four Bar Linkages Mechanisms of Lower Limb Exoskeleton suit in order to reduce the number of motors and increase stability during the Stance Phase. The results from the experiment have concluded that all feature in time domain has the most recognition rate which up to 99.39%.
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Combined HART-FFH1 solution using IEC 61804 for PID control in revamp projects
(2018-08-13)
Pongswatd, Sawai
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Julsereewong, Amphawan
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Thepmanee, Teerawat
In order to reduce investment cost of revamping an existing plant for digital transformation of field-level networks in the age of Industrial Internet of Things (IIoT), reusing existing Highway Addressable Remote Transducer (HART) field devices can become suitable with a solution through modification of process control loop. This paper aims to provide a practical technique based on IEC 61804 standard for integrating HART measuring device and Foundation Fieldbus (FF) H1 actuating device into a modern distributed control system (DCS) to work together in a proportional-integral-derivative (PID) control. A temperature control loop configured and operated on the DeltaV DCS is utilized as a descriptive case study to demonstrate the workability of the proposed technique. The combined HART-FF H1 solution can be useful in detailed engineering design of revamp projects to consider whether existing HART field devices will be reused to save on instrumentation costs. Experimental results verify that the studied temperature process can be controlled by employing the proposed technique, which allows users to select for assigning the control function block to locate between the host controller and the FF H1 actuating device.
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LQR/PID controller design of PLC-based inverted pendulum
(2018-01-01)
Sirisantisamrid, Kaset
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Wongvanich, Napasool
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Gulpanich, Suphan
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Tammarugwattana, Narin
This paper presents an LQR based PID controller to control the inverted pendulum system. The control design employs a control zoning approach whereby the entire pendulum system is divided into two regions: a normal pendulum region and the inverted pendulum region where the system is approximately linear close to the upright position. The LQR architecture is used to obtain optimal gains for the PID controller. An algebraic approach is also presented for selection of Q and R matrices. Experimental implementations with a PLC based system show that the computed gains yield the most stable controlled responses compared to the gains chosen through trial and errors.
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A new hybrid fuzzy proportional-derivative phase-locked-loop controller for DC servomotor speed control
(2007-08-01)
Sooraksa, Pitikhate
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Li, Chung Wai
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Damrongporn, Phuwanat
Some research work has been heading to the promising direction of enhancing conventional controllers with various powerful intelligent features. In this pursuit, the paper presents a new fuzzy-based phase-locked loop (FPLL) controller for DC servomotor speed control. Fuzzy logic provides fast response and enhances robustness of the system while PLL control gives excellent steady state system performance. Unlike the past literatures, this fuzzy-based controller employs a proportional-derivative (FPD) controller, which is constructed precisely based on rigorous mathematical analysis instead of using look-up tables, with stability guaranteed. Simulation and experimental results have signified the design objectives and been accomplished. The proposed new fuzzy-based PLL controller gives a better dynamic performance compared to a conventional PID controller. Copyright © 2007 Watam Press.
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Robust controller design for plant uncertainty
(2006-12-01)
Numsomran, A.
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Witheephanich, K.
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Tipsuwanporn, V.
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Klinsmitth, N.
This paper demonstrates how Robust Nominal Model Following Control (RNMFC) motivated by the adaptive model following concept is developed and proposed in this paper. The control structure of RNMFC is quite different from and much simpler than those of adaptive model following control schemes. RNMFC has three main features: the use of a nominal model of the plant as a reference model, the design of a model controller which fulfills the reference tracking requirement and the inclusion of a simple PID correction mechanism which copes with all dynamic deviations of the real plant from its nominal model. With its robust control structure, RNMFC separates the reference tracking and robustness fulfillment into two independent problems. The results illustrate the robustness of RNMFC that can be manipulated parametric uncertainty of motor servo system. © 2006 ICASE.

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