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Research on New Architecture for Open CNC System Based on Linux

In accordance with slow running speed in present soft CNC system, which is difficult to be adapted to machining with mass of data at high speed, an open architecture of soft CNC system with high performance is presented, which is based on PC+I/O hardware interface and satisfies the requirement of real time performance in data transmission by use of the fifos of RTAI, of which modules are redundantly designed to make its functions reconstructable, extensible and open by use of the routing technology of soft switch. In this system, functions of fine interpolation and movement control, a small portion of CNC system’s functions, are performed by the designed simple I/O hardware interface. It is expected to greatly improve the real-time performance and satisfy the requirement of high running speed in CNC system.