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The conventional computerized numerical controller (CNC) of machine tools has been increasingly replaced by a PC-based open architecture CNC (OAC) which is independent of the CNC vendor. The OAC and machine tools with OAC led to the convenient environment where it is possible to implement user-defined application programs efficiently within CNC. This paper proposes a method of operational fault cause diagnosis which is based on the status of programmable logic controller (PLC) in machine tools with OAC. The operational fault is defined as a disability state occurring during normal operation of machine tools. The faults are occupied by over 70% of all faults and are also unpredictable as most of them occur without any warning. Two diagnosis models, the switching function (SF) and the step switching function (SSF), are proposed in order to diagnose the fault cause quickly and exactly. The cause of an occurring fault is logically diagnosed through a fault diagnosis system (FDS) using the diagnosis models. A suitable interface environment between CNC and developed application modules is constructed in order to implement the diagnostic functions in the CNC domain. The diagnosed results were displayed on a CNC monitor for machine operators and provided to a remote site through a web browser. The result of this research could be a model of the fault cause diagnosis and the remote monitoring for machine tools with OAC.

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Abstract
1. 서론
2. 개방형 컨트롤러를 갖는 공작기계의 구조
3. 고장의 원인 진단 및 원격서비스 사례
4. 이기종 CNC 공작기계의 인터넷기반 입출력 신호점검 사례
5. 결론
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UCI(KEPA) : I410-ECN-0101-2009-552-016177506