Kummool, Sart
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Item type:Publication, AVAILABILITY THROUGH FIELD DEVICE DIAGNOSIS IN FEEDFORWARD CONTROL: A CASE STUDY OF FOUNDATION FIELDBUS-BASED TEMPERATURE CONTROL(2022-02-01); ; For endusers, requiring an action to enable a fieldbus-based process control that is not hazardous to continue its operation in the event of transmitter failures, it is essential to understand how diagnostic capability of field instruments is helpful in availability enhancement. In order to effectively implement a feedforward control strategy with increased availability, this article presents a control configuration method when utilizing a Foundation Fieldbus (FF)-based temperature feedforward control as an illustrative case study. Four function block assignment options for configuring the studied control strategy during engineering phase are described. The ‘Uncertain’ measurement status provided by temperature transmitters is treated as ‘Good’ measurement status in all control configuration options for availability goal by reducing process downtime. In addition, based on experimental results, a simplified Petri net model for logical behavior representation of the interested FF-based feedforward is also proposed. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Process safety enhancement of feedforward control using foundation fieldbus(2020-04-01); This paper presents a practical technique in engineering phase for enhancing safety of Foundation Fieldbus (FF)-based feedforward control through propagation of measurement validity and status information in the loop using function block language to prevent hazards in the presence of a transmitter failure. The proposed technique is based on fault diagnosis of FF devices to increase the safety beyond that found in basic control loops using traditional technologies. For hybrid architecture by assigning basic and advanced function blocks to execute in H1 field instruments and H1 interface module, respectively, all possible cases for configuring parameter options not only to shut the loop down when the failure occurs but also to resume the loop to normal when the failure disappears are described. The feedforward on temperature control of H1 segment configured and operated on the DeltaV integrated host is used for experimentally testing the correctness of the defined parameter options to provide function block interlocks and failsafe actions as well as fault recovery mechanisms. In addition, the Petri net model to represent the control loop behaviors for comparing the process safety enhancement in different scenarios from five cases of parameter configurations is also included. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, DIAGNOSTIC DATA-BASED SAFETY AND AVAILABILITY ENHANCEMENTS FOR AN ALTERNATIVE OF FEEDFORWARD CONTROL USING FOUNDATION FIELDBUS(2023-06-01); To enhance plant safety and production availability in case of transmitter failures for an alternative of Foundation Fieldbus (FF)-based feedforward control, this article proposes a practical technique for configuring control strategy using function block diagram concept. The proposed configuration technique is based on fault diagnostic data automatically accessed from FF transmitters to take actions for operating the studied FF-based control loop that utilizes a Bias/Gain (BG) function block to build feedforward summing function outside of a proportional-integral-derivative (PID) function block. The minor 'Uncertain' problem can be treated as severe 'Bad' problem to increase the safety of the control loop. On the other hand, the 'Uncertain' status can be configured to be treated as 'Good' status to improve the availability of the control loop. Six options for configuring function blocks to operate the temperature control performed at the DeltaV host system are described as a case study to demonstrate the workability of the proposed technique. Experimental results of the alternate feedforward control loop configured with different parameter options confirm that the diagnostic data provided by the transmitters used are very useful for implementing either the interested control loop with increased safety or the interested control loop with increased availability. Therefore, the user can strike a balance between safety and availability for the FF-based feedforward control utilizing BG function block. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Automatic weighing machine for improving competitiveness of Thai SMEs in seafood cold storage business(2016-02-10); ; Ukakimaparn, PrapartDue to sharply rising labor costs in Thailand, many small and medium sized enterprises (SMEs) in various industrial sectors including seafood industry need to improve their competitive capability. The aim of proposed system is to replace workers with automatic machine for upgrading Thai SMEs in seafood cold storage business to survive and maintain their independence. A technique to design and implement an automatic weighing machine for packaging process of fresh whole fish products is presented. The proposed machine is not only specially developed for use in wet environments but also simple to operate and easy to maintain. Its total cost is about one-fifth cheaper than imported machines. Performances of the implemented machine have been observed at a seafood cold storage in Mahachai, Samut Sakhon, Thailand. With automatically weighting operations, the productivity can be increased by more than 1.6 times, while the labor cost can be reduced to 0.625 times, compared to manual operations. In addition, a payback period is approximately equal to 1.14 years. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Flow metering modification for avoiding control valve cavitation in hydrocarbon industry(2016-11-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Using fieldbus physical layer diagnostics in maintenance practice(2013-02-15); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Real-time monitoring and reporting alarm system for pH measurement in wet scrubbers(2016-01-24); ; In order to improve a maintenance of wet scrubber operation for achieving harmful and polluting gas removal efficiency at a latex glove manufacturer in Thailand, this paper presents a technique to implement the real-time monitoring and reporting alarm system for pH measurement in wet scrubbers. All pH meter outputs are applied to an existing programmable logic controller (PLC) slave located on the master-slave network for production line control. A PLC master is communicated to an operator workstation running the supervisory control and data acquisition (SCADA) software. In addition, measurement data from the SCADA software are automatically transferred to the statistical process control (SPC) software installed in a data historian server. Traditional routine manual data collection and non real-time email notification are replaced by the proposed system, which provides the continuous automatic data collection as well as the real-time display and alarm functions. The automatic and reliable email notification in real time can be also obtained. Experimental results verifying the performance of the proposed system are also included. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Feedforward hybrid control using foundation fieldbus: A case study of temperature control with DeltaV system(2018-06-08); ; With Foundation Fieldbus (FF) technology, a control strategy can incorporate function blocks running in both host controller and field devices, which is known as hybrid control. This paper focuses on implementation of feedforward hybrid control by utilizing basic function blocks in H1 field devices and advanced function block in host controller to provide a guideline for detailed design to specify of the FF philosophy to be used in a greenfield or brownfield project for maximizing end user achievement. A laboratory-scale FF H1 segment configured and operated on the DeltaV host system for feedforward on temperature control is used as an illustrative case study to analyze three different configurations by assigning control function block into different field devices in terms of the network load for scheduled communications during segment macrocycle. Experimental results obtained from the preferred control loop with minimum scheduled traffic load verify that an improvement in disturbance response can be achieved. Using control block in field device for FF-based hybrid architecture can, therefore, be applied for creating the feedforward control with disturbance anticipation capability.