• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 2005년도 ICCAS
• /
• pp.575-579
• /
• 2005

In this paper, the development of an IMM(Injection Molding Machine) controller is discussed. Presently, the Mold Close and Open Control Method of a toggle-type IMM is open-loop control. Through the development, a PC based control system was built instead of an existing controller and a closed-loop control replaced the previous control method by using PC based PLC. To control the nonlinear system of toggle type clamping unit, a fuzzy PI control algorithm was selected and it was programmed by an IL(Instruction List) and a LD(Ladder Diagram) on a PC based PLC. The application of fuzzy algorithm as the control method was also considered to change a control object like a mold replacement or an additional apparatus. For the development of an IMM controller, PC based PLC of PCI card type, distributed I/O modules with CANopen and Industrial PC and HMI (Human Machine Interface) software were used.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 2005년도 ICCAS
• /
• pp.1309-1312
• /
• 2005

A multi-chemical supply system is developed and applied to a wet station, which uses the multi-chemical process in one bath. To control the concentration of two chemicals, control logic of a supply pump is programmed using the programable logic controller (PLC). By using the multi-chemical supply system, wet station with single bath is applied to cleaning process using multi chemicals such as buffed oxide etchant (BOE) and standard clean 1 (SC-1). The concentration of each chemical is measured in the bath to verify the multi-chemical supply system. The control range in the each chemical concentration is measured to 1.33weight% in NH4OH and 0.23weight% in H2O2. The multi-chemical supply system can be movable and usable as an independent module of fixed wet station. By simply midifying the PLC, a multi-chemical supply system can be developed for a wet station.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2001년도 춘계학술대회 논문집
• /
• pp.92-97
• /
• 2001

The major faults of CNC machine tool is operational error which is charge over 70%. This paper describes model of remote service and fault diagnosis for CNC machine tool with open architecture controller. For intelligent fault diagnosis, new model is proposed. In this paper, the three major operational faults, emergency stop error, cycle start disable and machine ready disable, are defined. Two diagnostic models based on the ladder diagram, switching function model, step switching function model, are proposed. For internet based remote service, suitable environment is proposed and implemented with web server and client.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2000년도 추계학술대회 논문집
• /
• pp.233-238
• /
• 2000

CNC machine tool is assembled by central processor, PLC(Programmable Logic Controller), and actuator. The sequential control of machine generally controlled by a PLC. The main fault occured at PLC in 3 control parts. In LC faults, operational fault is charged over 70%. This paper describes diagnosis model and data processing for remote monitoring and diagnosis system in machine tools with open architecture controller. Two diagnostic models based on the ladder diagram. Logical Diagnosis Model(LDM), Sequential Diagnosis Model(SDM), are proposed. Data processing structure is proposed ST(Structured Text) based on IEC1131-3. The faults from CNC are received message form open architecture controller and faults from PLC are gathered by sequential data.. To do this, CNC and PLC's logical and sequential data is constructed database.

• 한국조명전기설비학회:학술대회논문집
• /
• 한국조명전기설비학회 2008년도 춘계학술대회 논문집
• /
• pp.249-251
• /
• 2008

In Factory Automation(FA) used by Programmable Logic Controller(PLC), Ladder Diagram(LD) is the most widely utilized and plays an important role in industrial control system. But recently, the study about Sequential Function Chart(SFC) is performed actively. When we program by SFC, generally, we design one routine from start to end. This method is difficult to design block control system, and we often make mistakes. In this paper, we propose the method that we design block control system and we analysis the difference of the method used this paper from conventional method.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1987년도 정기총회 및 창립40주년기념 학술대회 학회본부
• /
• pp.90-94
• /
• 1987

A structured user-friendly procedures which enable users to program in GRAFCET form directly from sequence specifications have been developed. Using these procedures, we can program the programmable logic controller (PLC) in sequential control and realize programming, debugging, and real-time monitoring. GRAFCET has many advantages like parallelism expression, so we can expect higher productivity and easier maintenance than boolean language or relay-ladder diagram specification when adapts them to PLC.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2006년도 하계종합학술대회
• /
• pp.1021-1022
• /
• 2006

In industrial control system used by Programmable Logic Controller(PLC), Ladder Diagram(LD) is the most widely utilized and plays an important role in industrial control system. But recently, the study about Sequential Function Chart(SFC) is performed actively. When we program by SFC, generally, we design one routine from start to end. This method is difficult to design, and we often make mistakes. In this paper, we propose the method that we compose each sub-system after we design each sub-system, and we analysis the difference of the method used this paper from conventional method.

• 조명전기설비학회논문지
• /
• 제12권2호
• /
• pp.54-61
• /
• 1998

PLC를 사용한 공정제어시스템의 설계에서 PLC 표준언어중 LD 언어가 가장 널리 사용되고 있다. 그러나 LD 언어는 데이터처리와 유지보수에 대한 단점이 있다. 반면에 SFC 그래픽언어는 복잡한 순차동작을 간결하게 記述할 수 있는 완벽한 방법이지만, 인터록조건을 記述하는데 문제점이 있다. 본 논문에서는 기존의 SFC 컴파일러를 사용하여 인터록을 실현하는 방법을 제시하고, 실예로서 In-Line Spin Coater에 적용하여 타당성을 확인하였다.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2007년도 심포지엄 논문집 정보 및 제어부문
• /
• pp.265-266
• /
• 2007

본 논문에서는 안전등급 PLC(Programable Logic Controller) LD/FBD(Ladder/Function Block Diagram) 프로그램을 C-코드로 변환하는 C-코드 발생기의 시험에 관해서 다룬다. 개발된 C-코드 발생기는 로직 분석, 오류 검출, C-코드 생성 등 각 부분 별로 시험 항목을 설정하고 검증하는 방법에 대해서 서술한다. 또한 C-언어로 작성된 사용자 정의 함수/함수 블록에 관한 시험 항목을 기술한다.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2000년도 하계학술대회 논문집 D
• /
• pp.2750-2752
• /
• 2000

In this paper, Intelligent PLC for automatic warehousing system is presented. Intelligent PLC is that general PLC is incorporate the knowledge and experience of Expert and control method. This system is consist of sensor part, inference part and automatic warehousing robot part. this system recognize the Work by itself and move it to the appointed place according to the inference rule. The PLC program is constructed by LD(ladder diagram). Real test system was constructed and was driven to apply this program.