• Title/Summary/Keyword: distributed data-bus

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Network Type Distributed Control System with Considering Data Collision (데이터 충돌을 고려한 네트워크형 분산 제어 시스템)

  • Choi, Goon-Ho
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.29 no.1
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    • pp.113-120
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    • 2015
  • Network type distributed control system uses a communication line which is named the BUS to exchange a data among the sub-systems. Usually, on the bus, only one data must be exited at one time, so the control algorithm to prevent collision or to manage a priority of data is important. Including CAN Protocol, many kind of FieldBus which are used for distributed control system, prevent data collision by controlling transmission time. But, a system which have to make a control signal or get a data from a sensor at fixed time will be met a problem when it is composed by using a network type distributed control structure. In this paper, some of these cases will be discussed and solutions be proposed for preventing a data collision. Also, using Arago Disk System which have a structure for inner loop control, the validity of the proposed methods will be verified.

Design of a Small-Area, Low-Power, and High-Speed 128-KBit EEPROM IP for Touch-Screen Controllers (터치스크린 컨트롤러용 저면적, 저전력, 고속 128Kb EEPROMIP 설계)

  • Cho, Gyu-Sam;Kim, Doo-Hwi;Jang, Ji-Hye;Lee, Jung-Hwan;Ha, Pan-Bong;Kim, Young-Hee
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.13 no.12
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    • pp.2633-2640
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    • 2009
  • We design a small-area, low-power, and high-speed EEPROM for touch screen controller IC. As a small-area EEPROM design, a SSTC (side-wall selective transistor) cell is proposed, and high-voltage switching circuits repeated in the EEPROM core circuit are optimized. A digital data-bus sensing amplifier circuit is proposed as a low-power technology. For high speed, the distributed data-bus scheme is applied, and the driving voltage for both the EEPROM cell and the high-voltage switching circuits uses VDDP (=3.3V) which is higher than the logic voltage, VDD (=1.8V), using a dual power supply. The layout size of the designed 128-KBit EEPROMIP is $662.31{\mu}m{\times}1314.89{\mu}m$.

Wearable Personal Network Based on Fabric Serial Bus Using Electrically Conductive Yarn

  • Lee, Hyung-Sun;Park, Choong-Bum;Noh, Kyoung-Ju;SunWoo, John;Choi, Hoon;Cho, Il-Yeon
    • ETRI Journal
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    • v.32 no.5
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    • pp.713-721
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    • 2010
  • E-textile technology has earned a great deal of interest in many fields; however, existing wearable network protocols are not optimized for use with conductive yarn. In this paper, some of the basic properties of conductive textiles and requirements on wearable personal area networks (PANs) are reviewed. Then, we present a wearable personal network (WPN), which is a four-layered wearable PAN using bus topology. We have designed the WPN to be a lightweight protocol to work with a variety of microcontrollers. The profile layer is provided to make the application development process easy. The data link layer exchanges frames in a master-slave manner in either the reliable or best-effort mode. The lower part of the data link layer and the physical layer of WPN are made of a fabric serial-bus interface which is capable of measuring bus signal properties and adapting to medium variation. After a formal verification of operation and performances of WPN, we implemented WPN communication modules (WCMs) on small flexible printed circuit boards. In order to demonstrate the behavior of our WPN on a textile, we designed a WPN tutorial shirt prototype using implemented WCMs and conductive yarn.

Design and Implementation of an Interface Unit for Analysis of a CAN-Based Control System (CAN 기반 제어 시스템 분석을 위한 인터페이스 유닛 설계 및 구현)

  • Park, Byung-Ryuel;Jeong, Gu-Min;Ahn, Hyun-Sik;Kim, Do-Hyun
    • Proceedings of the KIEE Conference
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    • 2006.04a
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    • pp.195-197
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    • 2006
  • In this paper, an interface unit is designed to efficiently monitor transmission data in Controller Area Network(CAN)-based control systems. The CAN uses a serial multi master communication protocol that efficiently supports distributed real-time control with a very high level of data integrity, and communication speeds of up to 1Mbps. The interface unit is composed of a DSP controller which collects data on the CAN bus and transfers data to a personal computer via serial communication to save and display of interesting signals. The experimental system consists of three DSP controllers which represent electronic control units of a vehicle, an interface unit for analysing the data on the bus, and a graphic monitoring program coded on the Windows platform. The validity and the effectiveness of the proposed simple type of CAN interface unit are shown through the experimental results.

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Speed Control of DC Motor using Distributed Control System (분산형 제어시스템을 이용한 DC MOTOR 속도 제어)

  • Kim, Seung-Hyun;Jung, Joon-Hong;Park, Ki-Heon
    • Proceedings of the KIEE Conference
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    • 2004.11c
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    • pp.684-686
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    • 2004
  • This paper is concerned with the DC motor speed control using distributed control system. We design CAN nodes which can transmit control and monitoring data through CAN bus and apply these to distributed networked control system. The results of the experiment validate effectiveness of our distributed networked control system.

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A Differential Data Replicator in Distributed Environments

  • Lee, Wookey;Park, Jooseok;Sukho Kang
    • The Journal of Information Technology and Database
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    • v.3 no.2
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    • pp.3-24
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    • 1996
  • In this paper a data replicator scheme with a distributed join architecture is suggested with its cost functions and the performance results. The contribution of this scheme is not only minimizing the number of base relation locks in distributed database tables but also reducing the remote transmission amount remarkably, which will be able to embellish the distributed databse system practical. The differential files that are derived from the active log of the DBMS are mainly forcing the scheme to reduce the number of base relation locks. The amount of transportation between relevant sites could be curtailed by the tuple reduction procedures. Then we prescribe an algorithm of data replicator with its cost function and show the performance results compared with the semi-join scheme in their distributed environments.

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Tramsmission Method of Periodic and Aperiodic Real-Time Data on a Timer-Controlled Network for Distributed Control Systems (분산제어시스템을 위한 타이머 제어형 통신망의 주기 및 실시간 비주기 데이터 전송 방식)

  • Moon, Hong-ju;Park, Hong-Seong
    • Journal of Institute of Control, Robotics and Systems
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    • v.6 no.7
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    • pp.602-610
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    • 2000
  • In communication networks used in safety-critical systems such as control systems in nuclear power plants there exist three types of data traffic : urgent or asynchronous hard real-time data hard real-time periodic data and soft real-time periodic data. it is necessary to allocate a suitable bandwidth to each data traffic in order to meet their real-time constraints. This paper proposes a method to meet the real-time constraints for the three types of data traffic simultaneously under a timer-controlled token bus protocol or the IEEE 802.4 token bus protocol and verifies the validity of the presented method by an example. This paper derives the proper region of the high priority token hold time and the target token rotation time for each station within which the real-time constraints for the three types of data traffic are met, Since the scheduling of the data traffic may reduce the possibility of the abrupt increase of the network load this paper proposes a brief heuristic method to make a scheduling table to satisfy their real-time constraints.

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IEC61850 Process Bus Based Distributed Power Quality Monitoring (IEC61850 프로세서 버스 기반 분산형 전력품질감시)

  • Park, Jong-Chan;Kim, Byung-Jin
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.56 no.1
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    • pp.13-18
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    • 2007
  • In this paper, authors deal with an application of power quality monitoring using the Sampled Value which is described in the IEC61850 International Standard for substation communication. Firstly, while Merging Unit is designed as a process level device transmitting sensor data, the practical problems such as time delay compensation and optical fiber communication are issued. Secondly, the Sampled Value message which is proper to a power quality monitoring system is presented. Because the power quality monitoring system requests non time critical service comparing to protection and control applications, the Sampled Value service message structure is introduced to improve efficiency. At last, the power quality monitoring server having various power quality analysis functions is suggested to verify the performance of Merging Unit. With the diverse experiments, it is proved that the process bus distributed solution is flexible and economic for the power quality monitoring.

Design and Implementation of Distributed Control System based on Dual Field-bus for Ship Engine (이원화된 필드버스 기반의 선박 엔진용 분산 제어 시스템의 설계 및 구현)

  • Lee, Jae-Hyung;Kim, Dong-Sung
    • Journal of the Institute of Electronics Engineers of Korea SC
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    • v.49 no.2
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    • pp.1-9
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    • 2012
  • In this paper, we design and implement a DCS (Distributed Control System) based on dual field-bus for ship engine. For monitoring and controlling the condition of the ship engine, an implemented DCS is consisted of two-tier communication structure by using CAN (Controller Area Network) and MODBUS protocols. The first-tier is consisted of CAN protocol for sharing the condition of the ship engine by each implemented monitoring system. By using MODBUS protocol, the second-tier is used for communicating the monitoring data from an implemented DCS to AMS(Alarm Monitoring System). We verified and tested our scheme and implemented DCS by KR (Korea Register) technical rules through experimental tests.