• 제목/요약/키워드: aperiodic and periodic real-time data

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효율적인 실시간 데이터 수집시스템의 설계 (Design of an effective real-time data acquisition system)

  • 김동욱;염재명;김대원;박용식
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
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    • pp.1036-1039
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    • 1996
  • The performance of real-time systems depends upon how well the tasks are scheduled within a cycle time and how fastly the response is made according to the occurrence of an external event. This paper presents the design of an effective real-time data acquisition system in order to gather the data from an automobile engine. This paper investigates an estimation and a restriction method of execution for aperiodic data. Also, the guarantee problem of real-time constraint is presented for periodic data. Through the experiments, the hard real-time guarantee problem of periodic data is studied and the damage problem of periodic data according to the increase of aperiodic tasks is analyzed.

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원자력 발전소 분산 제어 시스템을 위한 네트워크의 실시간 특성 해석 (Real-Time Characteristic Analysis of a DCS Communication Network for Nuclear Power Plants)

  • 이성우;임한석
    • 대한전기학회논문지:전력기술부문A
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    • 제48권5호
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    • pp.650-657
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    • 1999
  • In this paper, a real-time communication method using a PICNET-NP(Plant Instrumentation and Control Network for Nuclear Power plant) is proposed with an analysis of the control network requirements of DCS(Distributed Control System) in unclear power plants. The method satisfies deadline in case of worst data traffics by considering aperiodic and periodic real-time data and others.

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원자력 발전소 디지털 제어 시스템을 위한 네트워크의 실시간 특성 해석 (Real-Time Characteristic Analysis of a DCS Communication Network for Nuclear Power Plants)

  • 이성우;김석곤;송성일
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2003년도 학술회의 논문집 정보 및 제어부문 B
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    • pp.797-801
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    • 2003
  • In this paper, a real-time communication method using a PICNET-NP (Plant Instrumentation and Control Network for Nuclear Power plant) is proposed with an analysis of the control network requirements of DCS (Distributed Control System) in nuclear power plants. The method satisfies deadline in case of worst data traffics by considering aperiodic and periodic real-time data and others.

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원자력 발전소 제어계통을 위한 네트워크의 해석과 사례 연구 (Analysis of a network for control systems in nuclear power plants and a case study)

  • 이성우;임한석
    • 제어로봇시스템학회논문지
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    • 제5권6호
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    • pp.734-743
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    • 1999
  • In this paper, a real-time communication method using a PICNET-NP(Plant instrumentation and Control Network for Nuclear Power plant) is proposed with an analysis of the control network requirements of DCS(Distributed Control System) in nuclear power plants. The method satisfies deadline in case of worst data traffics by considering aperiodic and periodic real-time data and others. In addition, the method was used to analyze the data characteristics of the DCS in existing nuclear power plant. The result shows that use of this method meets the response time requirement(100ms).

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

  • 문홍주;박홍성
    • 제어로봇시스템학회논문지
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    • 제6권7호
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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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Analysis of a Communication Network for Control Systems in Nuclear Power Plants and a Case Study

  • Lee, Sung-Woo;Gwak, Kwi?Yil
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2005년도 ICCAS
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    • pp.338-341
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    • 2005
  • In this paper, a real-time communication method using a PICNET-NP(Plant Instrumentation and Control Network for Nuclear Power Plant) is proposed with an analysis of the control network requirements of DCS (Distributed Control System) in nuclear power plants. The method satisfies deadline in case of worst data traffics by considering aperiodic and periodic real-time data and others. In addition, the method was used to analyze the data characteristics of the DCS in existing nuclear power plant. The result shows that use of this method meets the response time requirement(100ms).

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원자력 발전소 제어 계통을 위한 통신망의 해석과 사례 연구 (Analysis of a Communication Network for Control Systems in Nuclear Power Plants and a Case Study)

  • 이서우;윤명현;문홍주;신창훈;이병윤
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1999년도 하계학술대회 논문집 B
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    • pp.1013-1016
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    • 1999
  • In this paper, a real-time communication method using a PICNET-NP(Plant Instrumentation and Control Network for Nuclear Power plant) is proposed with an analysis of the control network requirements of DCS (Distributed Control System) in nuclear power plants. The method satisfies deadline in case of worst data traffics by considering aperiodic and periodic real-time data and others. In addition, the method was used to analyze the data characteristics of the DCS in existing nuclear power plant. The result shows that use of this method meets the response time requirement(100ms)

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분산 제어시스템에서 3가지 형태의 실시간 데이터를 고려하는 양극단 스케줄링 방법 (End-to-End Scheduling Method Considering 3-type RT-Data in Distributed Control Systems)

  • 김형육;박홍성
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2003년도 학술회의 논문집 정보 및 제어부문 A
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    • pp.311-314
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    • 2003
  • In recent years, distributed control systems(DCS) using fieldbus such as CAN have been applied to process systems but it is very difficult to design the DCS while guaranteeing the given end-to-end constraints such as precedence constraints, time constraints, and periods and priorities of tasks and messages. This paper presents a scheduling method to guarantee the given end-to-end constraints considering aperiodic, periodic and non-real-time message and task simultaneously. The presented scheduling method is the integrated one considering both tasks executed in each node and messages transmitted via the network and is designed to be applied to a general DCS that has multiple loops with several types of constraints, where each loop consists of sensor nodes with multiple sensors, actuator nodes with multiple actuators and controller nodes with multiple tasks.

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범용 이더넷 기반 경성 실시간 시스템에서의 메시지 전송 분산 알고리즘 (Message Distributed Algorithm for Realtime System based on General Purposed Ethernet)

  • 박종백;김명균
    • 한국정보통신학회:학술대회논문집
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    • 한국정보통신학회 2013년도 춘계학술대회
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    • pp.561-565
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    • 2013
  • 산업용 네트워크의 발전으로 인하여, 기존의 필드버스의 대안으로 데이터 처리량 및 확장성이 뛰어난 표준 이더넷으로의 기술 이동이 가속화 되면서 이더넷 기반의 실시간 산업 필드버스 기술이 발전해오고 있다. 이에 본 논문에서는 범용 이더넷 기반의 주기, 비주기적 메시지에 대한 경성 실시간 통신을 만족하는 전송 모델을 제안하며, 각 메시지에 대한 스케쥴링 알고리즘을 제안한다.

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