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In case of device and communication failures, a basic process control using Foundation Fieldbus technology can be configured to provide either safety improvement for preventing hazards or availability enhancement for minimizing production losses. The purpose of this paper is to introduce a system modeling with Petri Net technique for representing the behaviors of the proportional-integral-derivative...
A justification of the cost for providing system instrumented system (SIS) is essential for making the right decision of companies in process industry sector. This paper presents a design of the SIS by considering in cost-benefit analysis for optimizing safety, reliability, and lifecycle costs. A tail gas treating process is employed as a case study for verifying the proposed design method. The results...
This paper presents a test system for testing efficiency of single-suction centrifugal electric pumps for quality control in a manufacturer's production line. The proposed system based on testing an individual pump for an expected total head provides automatic test procedures to be conducted in accordance with the requirements specified in the Thai Industrial Standard (TIS) 2618-2557. The hardware...
Uniformity of temperature is important to comfortable indoor environment in building automation system (BAS). Usually, only a single temperature sensor is placed in the conditioned space for controlling an air handling unit (AHU) operation by using a direct digital controller (DDC) to maintain thermal comfort conditions. In order to improve an efficiency of heating, ventilating, and air conditioning...
This paper applies FMEA and FTA approach which has been proved to be acceptable and widely applied in many applications of modeling and methods supporting the production system and the safety and/or maintenance manager to identify how subsystems and components could fail and what are the corresponding effects on the whole system, and to quantify the reliability parameters for complex systems. A case...
This paper presents an improvement of inspection maintenance actions to reduce common cause failures of k-out-of-n redundant structures. Improving maintenance tasks for the programmable logic controllers with 1002 voting configuration and the control valves with 2003 voting configuration in a thermal power plant is described as an illustrative case study. The proposed improvement is based on common-cause...
This paper addresses the design of functional safety model for process automation in accord with IEC 61508/61511 standard. Functional safety design of a tail gas treating unit has been conducted in this study. The quantitative fault tree analysis approach which has been proved to be acceptable and widely applied in many applications of modeling and methods supporting the designer and safety engineer...
This paper describes the technique to integrate HART field devices into SCADA (Supervisory Control and Data Acquisition) system. Wire HART field device is connected to WirelessHART adapter (THUM) and WirelessHART device are assigned act as RTU(Remote Terminal Unit) in SCADA system. In system, THUM and WirelessHART device communicate to WirelessHART gateway that collects their data and send to master...
This paper presents the technique to convert TCP(Tool Center Point) position of joints value from 6-DOF four bars link structure (FBLS) robot into 6-DOF direct link structure (DLS) robot. The technique proposed to achieve the robot replacement and introduce of new effective robot model for working in same task. The collected data in set of joint value from FBLS that are joint angle, joint length,...
This paper presents a technique to evaluate for the standard uncertainty of temperature uniformity. In general, when considering the temperature test chamber as a constant temperature chamber that has achieved an arbitrary uniform temperature, the uncertainty at that achieved temperature can be separated into the two factors of chronological temperature fluctuation in time, and spatial temperature...
This paper presents a software configuration guideline for process alarming in proportional-integral-derivative (PID) loop using Foundation Fieldbus (FF) with control in the field. Process alarm configuration of FF H1 segment installed in a level-control plant model and operated by the DeltaV host system is examined as an illustrative case study. Experimental results showing relations between alarm...
A parallel-connected negative DC-DC converter using power saving techniques has been proposed in this paper. Unlike conventional negative converters, the proposed converter consists of four negative heap converters connected in parallel, where the power switch is driven by non-overlapped four-phase pulses cyclically. In two of the four negative heap converters, a part of the electric charge in parasitic...
To improve power efficiency, a power saving technique for the ring-type DC-DC converter is proposed in this paper. By reusing a part of the electric charge in stray parasitic capacitances, the proposed converter can achieve higher power efficiency than the conventional converter. The results of the simulation program with integrated circuit emphasis (SPICE) simulation showed that more than 8% of the...
This paper presents a method to improve process data reporting system in a sulfuric acid plant, which faced difficulties in accessing historical process data for effective use in process engineering, production management, quality management, and maintenance system. The proposed method running on existing distributed control system is based on the use of an IT process automation software called OpalisRobot...
This paper presents education of Foundation Fieldbus, an all-digital, serial, two-way communication standard oriented primarily on requirements of process industries. The purpose is to educate interested students in the technology that can serve as a common infrastructure for any process automation system from basic regulatory control to safety applications. Foundation certified training that prepares...
In general, the process of the SPRT module calibration takes long time and requires all employees participation in the calibration process, and it also requires an expert for calculation of results and measurement uncertainty. All of these waste a vast amount of working time. Therefore, this paper provides the automatic SPRT module calibration process which can reduce the steps of calibration, resulting...
This paper presents a Foundation Fieldbus-based laboratory for education of automation infrastructure. Design and implementation of a level-control plant model using multi-vendor field devices is proposed. Harmonas-DEO fieldbus system is described as an illustrative case study for configuring and commissioning fieldbus segment, defining control strategy, designing human machine interface (HMI) screen,...
This paper presents a simple circuit technique based on commercially available devices to implement voltage-controlled oscillator (VCO) with two high-impedance input terminals. By suitably setting two input signals, a linear frequency-voltage relation of the proposed VCO can be either positive or negative slope in the same scheme without any adapting configuration. The oscillation gain can be easily...
For mobile back-lighting applications, a switched-capacitor-based serial DC-DC converter using solar power supplies is proposed in this paper. Unlike conventional switched-capacitor DC-DC converters, the proposed converter pushes up the output voltage of a switched-capacitor-based circuit by the voltage of solar cells. For this reason, the proposed converter can realize not only long battery runtime...
This paper presents Seebeck effect-based thermoelectric power source utilizing waste heat in manufacturing processes for industrial wireless transmitters. An industrial wireless transmitter can be supplied by its internal battery in combination with the proposed thermoelectric power source to conserve battery lifetime. Moreover, the proposed power source can operate as the backup power supply for...
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