Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Development of DSP-based Modbus Communication Scheme and Control Module for Controlling Actuators in Industrial Equipment

산업용 장비에서의 액추에이터를 제어 하기 위한 DSP에서의 Modbus통신 구현과 제어 모듈 개발

  • Kim, Won-Jun (Dept. of Mechanical Design and Robot Engineering, Seoul National University of Science and Technology) ;
  • Gwak, Dong-Gi (Dept. of Mechanical Design and Robot Engineering, Seoul National University of Science and Technology) ;
  • Kim, Dong Hwan (Dept. of Mechanical System Design Engineering, Seoul National University of Science and Technology)
  • 김원준 (서울과학기술대학교 기계설계로봇공학과) ;
  • 곽동기 (서울과학기술대학교 기계설계로봇공학과) ;
  • 김동환 (서울과학기술대학교 기계시스템디자인공학과)
  • Received : 2017.03.31
  • Accepted : 2017.09.06
  • Published : 2017.11.01
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Abstract

In this work, a new control module and communication system associated with DSP are proposed to overcome the limitations of the contemporary prevailing PLC-based industrial equipment controller, and the performance of the proposed system was experimentally verified. In the light of this issue, a communication conversion scheme from RS-485 to Modbus, the dominant communication protocol used by PLC, was developed and shown to yield enhanced compatibility between devices. The proposed system allows for ~50％ cost reduction as well as downsizing of the industrial controllers. Furthermore, the design includes 24 V general digital I/O pins, which facilitate partial expansion of inputs and outputs. With Modbus communication implemented in DSP with the RS-485 interface, multi-to-multi communication may also be achieved.

PLC 시스템은 자체 모듈에 의한 부분적 확장성을 지원하고 있지만, 확장을 위한 비용이 크고, 센서 및 기타 제어기들과의 언어 호환성 또한 문제가 되고 있다. 본 논문에서는 빠르게 변화하는 기술에 대처하기 위해 텍사스 인스트루먼트 사의 DSP(디지털 시그널 프로세서)를 이용하여 PLC를 대체 및 보조할 수 있는 시스템을 제안한다. 이 시스템은 기존 PLC의 기능을 통합적으로 구현하며, 범용으로 쓰이는 PLC 에 비해 속도가 빠르고, 약 50% 이상의 비용 절감이 가능하다. 또한, 모듈 형태의 24V의 범용 디지털 I/O핀을 구성함으로써 선택적으로 입력과 출력의 부분적 확장을 용이하게 하였다. 일반적 산업 장비의 제어를 위해 널리 사용되고 있는 모드버스 통신을 RS-485 인터페이스를 기반으로 DSP에서 구현함으로써, 장비 간 다대다 통신을 할 수 있도록 하였다.

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References

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