【正文】 。one architecture CNC unit prises main board, position control card, PLC card, displayer card, and power supply. Main board is a big printed circuit board。PC architecture4. software based open architecture of CNC unit《 NC Technology 》 E－ mail: .All173。in173。one board architecture 2. multi173。 Technical parameters pensation 8. Enhanced graphic display function 9. Self173。The hardware and the software work together to do all functions of CNC unit, which an ordinary NC system can never do.《 NC Technology 》 E－ mail: .The main functions and features of CNC unit 1. Controlling function (the number of control axes and synchronously control axes) 2. Preparatory function3. Interpolation function 4. Feed function216?！? NC Technology 》 E－ mail: .CNC unit 216。5）位置控制： 在每個(gè)采樣周期內(nèi)，將插補(bǔ)計(jì)算出的理論位置與實(shí)際反饋位置相比較，用其差值去控制進(jìn)給伺服電機(jī)。 簡(jiǎn) 要工作 過 程： 1）輸入 ： 輸入內(nèi)容 —— 零件程序、控制參數(shù)和補(bǔ)償數(shù)據(jù)?！? NC Technology 》 E－ mail: .CNC裝置的裝置的 組組 成和工作原理成和工作原理 CNC系統(tǒng)平臺(tái)硬件操作系統(tǒng)管理軟件應(yīng)用軟件 控制軟件數(shù)控加工程序 接 口被控設(shè)備 機(jī) 床 機(jī)器人 測(cè)量機(jī) ......《 NC Technology 》 E－ mail: .CNC裝置的裝置的 組組 成和工作原理成和工作原理1. 硬件結(jié)構(gòu) : CPU， 存儲(chǔ)器，總線、 外設(shè) 等 。《 NC Technology 》 E－ mail: .CNC machining SystemLogical structure of CNC machine tool《 NC Technology 》 E－ mail: .CNC machining System《 NC Technology 》 E－ mail: .CNC系系 統(tǒng)統(tǒng) 的的 組組 成成216。 they have no means of editing existing programs. CNC controls can store and allow editing of loaded programs.v All machines built today are CNC machines. CNC unit is the heart of CNC machine.《 NC Technology 》 E－ mail: .NC system 216。 The NC machine :1. control unit, which processes the mands from the input media. 2. the drive mechanisms3. the machine itself 216。從自動(dòng)控制的角度來看， CNC系統(tǒng)是一種位置（軌跡）、速度（還包括電流）控制系統(tǒng)，其本質(zhì)上是以多執(zhí)行部件 (各運(yùn)動(dòng)軸 )的位移量、速度為控制對(duì)象并使其協(xié)調(diào)運(yùn)動(dòng)的自動(dòng)控制系統(tǒng)，是一種配有專用操作系統(tǒng)的計(jì)算機(jī)控制系統(tǒng)。2. 軟件結(jié)構(gòu) ： 是一種用于零件加工的、實(shí)時(shí)控制的、特殊的（或稱專用的）計(jì)算機(jī)操作系統(tǒng)。 輸入方式 —— 穿孔紙帶閱讀輸入、磁盤輸入、光盤輸入、手健盤輸 入，通訊接口輸入及連接上級(jí)計(jì)算機(jī)的 DNC接口輸入 .《 NC Technology 》 E－ mail: .CNC裝置的裝置的 組組 成和工作原理成和工作原理2）譯碼： 以 一個(gè)程序段 為單 位，根據(jù)一定的 語 法 規(guī)則 解 釋 、翻 譯 成 計(jì)算機(jī)能 夠識(shí)別 的數(shù)據(jù)形式，并以一定的數(shù)據(jù)格式存放在指定的內(nèi)存 專用區(qū)內(nèi)。6） I/O處理： 處理 CNC裝置與機(jī)床之間的強(qiáng)電信號(hào)輸入、輸出和控制。CNC unit is the core of the whole CNC system. It is posed of hardware and software. 216。 Feed Rate Override216。diagnosis function 10. Communication function 11. Programming function 《 NC Technology 》 E－ mail: .Functional interface between hardware and software in CNC unit 《 NC Technology 》 E－ mail: .HARDWARE ARCHITECTURE OF CNC UNIT216。functional modules architecture v by the number of microprocessors1. single microprocessor2. multi173。NC architecture3. NC173。in173。 other functional cards are small size, each is installed in a card rack on the main board. 《 NC Technology 》 E－ mail: .Sketch map of All173。sharing in a centralized control way.? in this architecture. Some CNC system, though having more than two processors ,can only be called single microprocessor systems, because there is only one micro173。masterandservant system216。and173。 CNC unit of this architecture base on industry puter (IPC) platform, and is built by plugging in certain control cards and NC software. IPC platform has made CNC unit cheaper and cheaper in price, and easily to be substituted when fault occurs IPCCNC unit CNC system《 NC Technology 》 E－ mail: .Typical CNC Units216。BRANDLEY (American A173。Sky (ShenYang Institute of Computing Technology) 《 NC Technology 》 E－ mail: .CNC SOFTWARE In CNC system, there are various kinds of software codes, which fall into two groups: user software and system software.《 NC Technology 》 E－ mail: .User software216。 decode the machining instructions in part codes and do decimal173。 pre173。 Speed control can be implemented totally by software method (software timer method), and can also be implemented by hardware means. 《 NC Technology 》 E－ mail: .The function of control softwa