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Communication Redundancy for Reliability Improvement in an Industrial Monitoring and Control System
Rhyu, Keel-Soo,Chung, Kyung-Yul The Korean Society of Marine Engineering 2004 한국마린엔지니어링학회지 Vol.28 No.8
In development of monitoring and control systems, one of the most important points is to consider a redundancy so that the system can be operated normally although hardware faults are partly occurred. The purpose of this paper is to introduce a monitoring and control system with a redundancy function for I/O servers and communication networks. I/O servers composed with an active server and a standby server. Each server also has 3 communication ports, 2 ports of them were connected to field units and the other 1 port was connected to the other server. Field units have to be constructed to 2 communication ports connected I/O servers through communication lines. Also, server communication module was implemented for analyzing and handling fault elements. and was submodularized for linking easily with a monitoring and control module. An experiment with 2 servers and 2 field units was constructed to demonstrate its effectiveness.
류길수(Keel-soo Rhyu),박상우(Sang-woo Park),김달현(Dal-hyun Kim),박종일(Jong-il Park),정철민(Cheol-min Jeong) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
LD(Ladder Diagram) is one of PLC programming language provided in IEC 61131-3 standard, is used most widely. PLC is logic language to operate only in private hardware. Nowadays with the development of hardware, many study is being carried about to operate SoftPLC type to be included in PLC for samely functions. In this study, we are discussing about GUI implementation of LD logic editor for development tool for SoftPLC using LD. We define a new language is called LDI(Ladder Diagram Instruction) to save LD to a file.
류길수(Keel-soo Rhyu),박상우(Sang-woo Park),김달현(Dal-hyun Kim),박종일(Jong-il Park),정철민(Cheol-min Jeong) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
In this paper, we suggest the compiler implementation of a LD logic editor. The compiler load the LDI(Ladder Diagram Instruction) file saved by LD logic editor and analyze the lexicon and sentence to detect errors and convert to IL(Instruction List) of IEC 61131-3 standard. The converted IL is translated to binary code and the compiler generate the executable binary formed file to execute in SoftPLC.
감시제어 시스템의 신뢰성 향상을 위한 서버 및 네트워크 이중화
류길수(Keel-Soo Rhyu),윤병수(Byung-Soo Youn),임대근(Dae-Kwen Lim) 한국마린엔지니어링학회 2004 한국마린엔지니어링학회 학술대회 논문집 Vol.2004 No.-
Recently, together with development of communications technology, monitoring and control systems have been used in many fields. When monitoring and control systems are developed, one of important things is considered about a redundancy whenever hardware faults are occurred partly.<br/> In this paper, we introduce a monitoring and control system with a redundancy function for servers and networks. The system, therefore, has an active server and standby server. In fields. all field units have to be constructed 2 communication ports connected each server through communication lines. Also. each server's communication program is implemented by analyzing and handling fault elements, and is modularized for linking easily with a monitoring and control module. An experiment with 2 servers and 2 field units is constructed to demonstrate its effectiveness.<br/>
Cnet 프로토콜을 이용한 PLC간의 다중무선통신에 관한 연구
류길수,이후락,정경열,Rhyu Keel-Soo,Lee Hoo-Rach,Chung Kyung-Yul 한국마린엔지니어링학회 2005 한국마린엔지니어링학회지 Vol.29 No.4
This paper addresses the design and implementation of a wireless network. proposed as a cost-effective support platform for PLCs. With this network. one or more supervising stations may access remote equipment like PLCs. An applicable communication methods are described and we applied efficient method among them to PLCs communication. The paper specifies these requirements and indicates methods to fulfill them. Also. it provides to the model of operation, and focuses on the implementation approach. The hardware and software design is described together with a number of critical points related to wireless communication on the Cnet. Furthermore, a discussion on system expandability and performance is tackled and some observations are stated. The main conclusion is, that the proposed method can feature good performance under normal operating conditions.
위피 플랫폼 기반의 모바일 어군탐지 시스템 설계 및 구현
원라경(La-kyoung Weon),류길수(Keel-soo Rhyu),박승수(Sung-soo Park),성창규(Chang-gyu Seong),박종일(Jong-il Park) 한국마린엔지니어링학회 2007 한국마린엔지니어링학회 학술대회 논문집 Vol.2007 No.-
The development Information Technology has been provided convenience and joy to life. According to popularization of mobile phone, the number of wireless contents is increasing. In this study, we designed and implemented a fish searching system on WIPI mobile platform.