The Research Of Open NC System Based On SERCOS Interface

Open numerical control system is research hotspot of NC technology now. This paper brings a open NC system based in SERCOS interface; constructs its software and hardware platform. With this platform, basic function of softCNC can be realized, this platform can be also used in rolling control system, expected result is arrived.SERCOS interface, a serial real-time communications system, is an connection of NC controller, drives, motion unit and I/O unit of NC control system, which are connected by a fiber optical ring. So SERCOS interface can realize real-time and synchronous data transformation, and ensure synchronous motion and control precision of system. Instead of SERCOS initiative card, SoftSERCANS card can ease its varies parameter, which makes development more simple.The paper applies this open NC system based SERCOS interface to the research of machine NC system and practice of rolling cut control system of high speed WALENG board, builds each softCNC platform, finishes the whole data process including syntax analysis, data process, interpolation, motion control and feedback display. The software frame has great similarity between these two different field NC control system. The software consists of two processes, one is Win32 process for unreal-time dealing, the other is RTX process for real-time motion control. They communicate through shared memory. NC exchanges data with drive by SoftSERCANS. Although many details are not involved, this open NC system based SERCOS interface has excellent opening in various NC control fields.In this paper, software is programmed with VC in Windows NT embedded RTX ,shared memory is created for communication between two process, multithread is created for multitask.