제어로봇시스템학회:학술대회논문집

Institute of Control, Robotics and Systems (제어로봇시스템학회)
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A technique to expand the I/O of the PLC Using remote I/O module

  • Suesut, Taweepol (Faculty of Engineering, King Mongkuts Institute of Technology Ladkrabang) ;
  • Kongratana, Viriya (Faculty of Engineering, King Mongkuts Institute of Technology Ladkrabang) ;
  • Tipsuvannaporn, Vittaya (Faculty of Engineering, King Mongkuts Institute of Technology Ladkrabang) ;
  • Kulphanich, Suphan (Faculty of Engineering, King Mongkuts Institute of Technology Ladkrabang)
  • Published : 1999.10.01
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Abstract

In this paper, a technique to expand the Input and Output (I/O) of the programmable logic controller (PLC) using remote I/O module is presented. The controller and the remote I/O module should have the same protocol and are interfaced through RS 485. Each remote I/O module consists of 16 digital input and 16 digital output, and the maximum of 32 remote I/O module can be linked to one controller. The remote I/O is programmed for interrupt request to controller independently. Therefore, there is no affect to the scan time of the controller. Using this technique, the PLC can be efficiently applied to the several hundred meters different control points such as the ON-OFF control fur the agriculture farm, the building automation system, a multi group of machine control.

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