• Title/Summary/Keyword: PLC

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A Study and Application of Methodology for Applying Simulation to Car Body Assembly Line using Logical Model (Logical 모델을 활용한 자동차 차체 조립 라인의 시뮬레이션 적용을 위한 방안 연구 및 적용)

  • Koo, Lock-Jo;Park, Snag-Chul;Wang, Gi-Nam
    • Korean Journal of Computational Design and Engineering
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    • v.14 no.4
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    • pp.225-233
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    • 2009
  • The objective of this paper is to examine a construction method and verify PLC logic using the logical modeling and simulation of a virtual plant has complex manufacturing system and the domain of application is car body assembly line of automotive industrial operated by PLC Program. The proposed virtual plant model for the analysis of the construction method consists of three types of components which are virtual device, intermediary transfer and controller is modeled by logical model but it the case of the verification of PLC program, HMI and PLC logic in the field substitute for the controller. The implementation of the proposed virtual plant model is conducted PLC Studio which is an object-oriented modeling language based on logical model. As a result, proposed methods enable 3D graphics is designed in the analysis step to use for verification of PLC program without special efforts.

A Development of Module Operating on Standby-power Reduction for PLC Control Modem (제어용 PLC 모뎀을 위한 대기전력 절감 모듈 개발)

  • Kim, Kl-Hyun;Kim, Ji-Hong;Kim, Nam-Kyun;Kim, Sang-Cheol;Seo, Kil-Soo;Kim, Eun-Dong
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2004.07a
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    • pp.296-299
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    • 2004
  • This paper introduces a supplementary module reducing tile standby-power of Power Line Communication(PLC) modem, one of the network equipments that take up much of tile stand-by power. This supplementary module consists of three parts, such as a compare part, a control part, and a switch part. This supplementary module controls the power going from the power supply element into PLC modem, which brings about the effect of standby-power reduction. It is assured that over 30% standby-power reduction is estimated when we applied this module to a low-speedy PLC control modem.

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A Study on Development of Home Network on PLC (PLC기반 홈네트워크 구축에 관한 연구)

  • Kang, Young-Goo;Jin, Jin-Yu;Yang, Hae-Sool
    • Proceedings of the Korea Information Processing Society Conference
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    • 2008.05a
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    • pp.25-27
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    • 2008
  • 전력선을 이용한 PLC기술은 경제성과 접근의 용이함으로 현재 많은 각광을 받고 있는 첨단기술이다. 최근 국내외 PLC 핵심기술을 활용한 부가서비스가 개발되고 시장규모가 커짐에 따라 PLC 네트워크 기술의 중요성이 커지고 있다. 본 연구에서는 PLC 핵심기술을 이용해 방범, 가스제어, 조명제어, 가전기기 제어, 도어락 제어, 영상감시, 휴대폰 영상통보 등 기능을 갖춘 PLC 기반 통합관리 네트워크를 제안하고자 한다.

Broadband Impedance Matching Circuit Design for PLC Coupler Using Tchebycheff Equalizer

  • Kim, Gi-Rae;Tangyao, Xie
    • Journal of information and communication convergence engineering
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    • v.7 no.2
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    • pp.113-118
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    • 2009
  • This paper is about design broadband impedance matching circuit for Coupler to improve power transfer efficiency in the power line communication (PLC) system. The Tchebycheff gain function algorithm is represented to design broadband matching circuit. A practical PLC Coupler impedance matching circuit is designed, and the characteristics for S11 and S21 of PLC coupler are enhanced comparing with unmatched one. This is done by maximizing the power transfer gain from modem to the load.

The application of a virtual plant simulator and a Ladder Diagram of PLC (PLC LD 제어언어와 가상 플랜트 시뮬레이터의 적용)

  • Lee, Gi-Bum;Lee, Jin-S.
    • Proceedings of the KIEE Conference
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    • 1999.07b
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    • pp.699-702
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    • 1999
  • This paper represents the application of a virtual plant simulator and a Ladder Diagram of PLC. A target plant is a material transport car that repeatedly conveys along the rails. The whole process is automatically operated by PLC. The simulation system consists of the POSFA PLC and the virtual plant simulator. We demonstrate that operation of a LD program corresponds to operation of the virtual plant simulator.

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전력선이용 통신의 경쟁력 분석 및 시장전망

  • 김병운
    • Proceedings of the Korea Technology Innovation Society Conference
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    • 2001.05a
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    • pp.93-103
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    • 2001
  • 전력선 이용 통신(PLC : Power Line Communication)는 전화선, CATV망, 위성에 이어 제4의 통신망 산업으로 급부상하고 있다. 본 연구에서는 젤라인 및 피엘콤의 PLC를 중심으로 기술특성 및 인터넷 접속가격 비교을 통해 PLC 와 다른 대체상품과의 경쟁력을 분석하였다. PLC는 기술적인 측면에서 제한된 전송전력, 높은 부하 간섭, 가변감쇄, 그리고 임피던스 레벨등의 단점을 가지고 있다. 그러나 PLC는 다른 대체상품에 비해 속도 및 가격측면에서 절대 및 비교우위를 가지고 있다. 따라서 기술적인 문제점들을 해결하여 상용화에 성공할 경우 기존의 인터넷접속 서비스 상품과 경쟁하는 제3의 유선통신망으로 등장하면서 기존 통신서비스 시장의 구도를 크게 바꾸어 놓을 것으로 전망된다.

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A multiple wireless communication module for PLC controller (다중 무선 제어용 PLC 통신 모듈 개발)

  • Park, Jong-Seok;Huyn, Woong-Keun;Yu, Chun-Sik
    • Proceedings of the KIEE Conference
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    • 2000.07d
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    • pp.2423-2425
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    • 2000
  • A wireless communication module for multiple PLC was developed. The function of the developed system are dual communication, concurrent multiple communication. PLC control, d interpretation of PLC command, and A/D D/A converting. The multiple communication approach is based on master-slave control concept. To show validity of the developed module, severial experiments are illustrated.

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A Study on the Knowledge-based PLC Ladder Programming System (PLC 래더다이어그램 생성을 위한 지식기반시스템에 관한 연구)

  • 강신한;김광만;이재원
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.17 no.30
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    • pp.153-160
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    • 1994
  • In this paper, we present the application of knowledge-based system technique for generating of PLC ladder diagram The developed prototype system receives a time chart as an input and generates a ladder logic as its output This results in the computerization and intellegent processing of PLC programming. The system can be effectively applied to sequence control where the PLC programs need to be frequently changed and generated.

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PLC와 공장자동화

  • 김종원
    • Journal of the KSME
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    • v.30 no.1
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    • pp.17-21
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    • 1990
  • 공장자동화에 있어서 PLC의 용도를 적용사례 중심으로 알아보았다. PLC는 FA공정제어 장치의 기초단위로서 매우 중요한 위치를 차지하고 있으며, 기존의 릴레이제어반의 단점을 매우 효율적 으로 해결할 수 있게 해준다. 또한, 특히 기계기술자의 입장에서 볼 때, PLC 자체가 FA공정제 어용 전용 컴퓨터로서, 표준화장비이므로, 전기 및 전자공학적인 깊은 지식이 없이도 쉽게 그 사용법을 이해할 수 있다는 장점을 가지고 있다.

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Expression and Possible Role of Phospholipase C $\beta1$ and $\gamma1$ in Mouse Oocyte Maturation and Preimplantation Embryo Development (생쥐 난자의 성숙과 착상전 배발생에서의 Phospholipase C $\beta1$$\gamma1$의 발현 및 기능)

  • Lee, Young-Hyun;Geum, Dong-Ho;Shim, Chan-Seob;Suh, Phan-Gil;Kim, Kyung-Jin
    • Development and Reproduction
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    • v.2 no.1
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    • pp.9-20
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    • 1998
  • It has been wel known that phospholipase C(PLC) plays an important role in the intracellular signaling in a variety of cell types. However, involvement of PLC in mouse oocyte maturation and preimplantation embryo development remains unknown. The present study examined the expression patterns of the mouse PLC \beta 1 and \gamma 1 during oocyte maturatio and preimplantation embryo development study examined the expression patterns of the mouse PLC \beta 1 and \gamma 1 during oocyte maturation and preimplantation embryo development by the competitive reverse transcription-polymerase chain reaction (RT-PCR method). PLC \gamma 1 mRNA (0.1 fg) was readily detected in germinal vesicle (GV)-stage oocyte and its level was reduced as meiotic resumption proceeded. PLC-\beta 1 mRNA (<0.1 fg) as detected at low level at GV-stage oocytes and scarcely detected at germinal vescle breakdown (GVBD)-stage oocytes. After fertilization, both PLC \beta 1 and \gamma 1 mRNA levels began to increase at morula-stage embryos (0.2 fg) and were more prominent in blastocyst-stage embryos(1 fg). to elucidate the possible involvement of PLC via protein kinase C(PKC) pathway during oocyte maturation and preimplantation embryo development , the effects of sphingosine (PKC inhibitor), sn-$diC_{8}$(PKC activator) anc U73122 (PLC ingibitor) were examined. Treatment of GV-stage oocytes with sphingosine (20 \mu M) facilitated the meiotic resuption by 10-20 over the control within 1 h as judged by GVBD, whereas U73122 failed to show any significant effect. U73122 (10 \mu M) effectively blocked the compaction of morula, while sn-$diC_{8}$(50 \mu M). In summary, the present study shows that the mouse PLC \beta 1 and \gamma 1 are expressed in a developmental stage-specific manner and PLC-PKC pathway may be involved in early preimplantation embryo development.

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