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Abstract
In this paper, a simplified CNC system based on PLC and position controller is introduced. The position controller FX2N-20GM, is a pulse chain output unit, which can control motors to accomplish linear interpolation and circular interpolation. PLC,with the mode of FX2N-16MR, the logic control unit of system, reads position data from the position controller and determines the operation of the system. Labwindows/CVI,the configuration software on PC, is the upper monitoring system, showing the motors position in real time by monitoring PLC. The system, combined PLC , position controller and configuration software, can draw any kinds of two dimensional graphics and show the trajectory of motors on PC in real time, the linear interpolation and circular interpolation had been perfectly implemented by a series of experiments. Compared with classic CNC system, it did not contain tedious hardware wring or complex software programming, which makes the whole structure a simplified CNC system.
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