• Journal of Institute of Control, Robotics and Systems
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• v.6 no.4
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• pp.313-319
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• 2000

As the interest of flexible manufacturing systems and computer integrated manufacturing systems increase, the distribution of centralized control systems using industrial control networks is getting more attention. In this paper, we investigate the rate-based traffic control of industrial control networks to improve the performance regarding the throughput, fairness, and error rates. Especially, we consider the protocol of Lon-$Works^{(TM)}$ which consists of all OSI 7-layers and supports various communication media at a low cost. Basically, the proposed rate-based traffic control system is closed loop by utilizing the feedback channel errors, which shows improved performance when compared with other industrial control networks commonly operated in open loop. To this end, an additional network node called monitoring node is introduced to check the channel status without increasing the channel load. The Proposed control loop is in effect whenever the feedback channel error becomes greater than an admittable value. We demonstrate the improved performance of the controlled network system in view of throughput and fairness measures by implementing the lab-scale network system based on LonWorks and through the experimentation upon it.

• Proceedings of the IEEK Conference
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• 2002.06a
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• pp.367-370
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• 2002

In this paper, we propose a new node architecture LonWorh control Network for home network system environmint using power line communications. Using conventional Lon Work technology is a many disputable points for home network. LonWork network system needs high-cost development equipment. Moreover, conventional Lon Work system can not implement high-grade algorithms and variety application operation. because of the limitation of processing ability in Neuron chip. For that reason, the proposed structure is applicable to low-cost and more complex applications which are impossible in home network using conventional Lonworks structure. The proposed structure is implemented with some hardware and かone software for power line home network. The physical layer and the MAC layer of the LonTalk protocol within ton Work are implemented in hardware, which decreases the development costs communication processor. The upper of link layer of the LonTalk protocol is implemented with software, which decreases the development costs of software and increases the flexibility of tile system and increases the extension of the system. We verified the commercial feasibility of the proposed system through the power line tests with the existing LonWorks network in home network. As a result, it is concluded that the proposed architecture provides increasing flexibility and decreasing cost of the system.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10c
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• pp.703-705
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• 2002

본 논문에서는 홈 자동화 네트워크의 대표적으로 자리잡고 있는 론웍스(Lonworks) 시스템의 하드웨어 플랫폼인 뉴론칩(Neuron) 기반의 노드를 대신하는 새로운 구조를 갖는 홈 자동화 제어기를 제안한다. 기존의 론웍스 해답(Solution)은 8비트 프로세서인 뉴론칩을 모든 노드들이 중앙처리장치로 사용하므로 고성능의 처리를 필요로 하는 응용 프로그램은 구현할 수 없었다. 또한 뉴런C(Neuron C) 언어를 사용하여 응용 프로그램을 개발하므로 C 언어에서 파생된 언어인 뉴런C 언어를 새롭게 배워야 하는 번거로운 점을 가지고 있으며, 뉴런C 컴파일러(Compiler)를 비롯한 LonMaker 등의 고가의 개발 장비를 구비해야 하므로 개발자로 하여금 개발비용에 대한 부담이 컸다. 이에 본 논문에서는 처리능력이 뛰어나며 저전력 특성을 갖춘 스트롱암(SA1110)칩을 메인 프로세서로 사용한 홈 자동화 제어기인 ECONICS를 개발했다. 이 ECONICS는 홈 제어 네트워크를 구성하기 위해 통신 하드웨어 및 ANSI 표준 프로토콜인 EIA709.1 통신 프로토콜 스택을 가지고 있다. 제안된 홈 자동화 제어기를 통하여 기존의 론웍스 노드에서 구현하기 힘든 다양하고 복잡한 응용프로그램을 구현할 수 있게 되었고, 제안된 홈 자동화 제어기의 상업적 유용성을 증명하기 위해 기존의 론웍스 노드들과의 호환성을 확인하였으며 개발자로 하여금 기존의 C 언어를 통하여 응용프로그램을 개발하게 함으로써 추후 홈 자동화 제어기로써 파급효과가 클 것이다.