【正文】 3. NC173。 other functional cards are small size, each is installed in a card rack on the main board. 中國電子科技集團(tuán)公司科技與質(zhì)量部 *《 NC Technology 》 E－ mail: Sketch map of All173。masterandservant system216。 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中國電子科技集團(tuán)公司科技與質(zhì)量部 *《 NC Technology 》 E－ mail: Typical CNC Units216。Sky (ShenYang Institute of Computing Technology) 中國電子科技集團(tuán)公司科技與質(zhì)量部 *《 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 *《 NC Technology 》 E－ mail: User software216。 pre173。return173。 Managing software can be divided into two groups: one prises the subroutines that tie to hardware, and another is independent of hardware. 216。sharing technology （ 資源共享）216。microprocessors architecture to improve process speed. 216。hard173。 CNC system software: foreground application and background application. 216。 There is no distinction of background and foreground applications in this architecture. Except for initializing procedure, this architecture divides all control programs into interruption service procedures with different priorities, so that bees a large multilevel interruption system. 216?？蓽p少產(chǎn)品品種 ， 便于批量生產(chǎn)、提高可靠性和降低成本，增強(qiáng)市場供應(yīng)能力和競爭能力 。How many types of CNC units exist depending on the number of CPU they include? What is the character of each type?216。station/Machine Controller)和 OMAC(Open Modular Architecture Controller)計劃– 歐共體： OSACA（ Open System Architecture for Control within Automation Systems)計劃– 日本： OSEC(Open System Environment for Controller)計劃– 華中 I型 —— 基于 IPC的 CNC開放體系結(jié)構(gòu)– 航天 I型 CNC系統(tǒng) —— 基于 PC的多機(jī) CNC開放體系結(jié)構(gòu) 中國電子科技集團(tuán)公司科技與質(zhì)量部*《 NC Technology 》 E－ mail: 國內(nèi)外開放式數(shù)控系統(tǒng)的研究進(jìn)展國內(nèi)外開放式數(shù)控系統(tǒng)的研究進(jìn)展 ：1） CNC可以直接地或通過網(wǎng)絡(luò)運(yùn)行各種應(yīng)用軟件2）用戶操作界面的開放。體系開放化 定義（ IEEE）： 具有在不同的工作平臺上均能實現(xiàn)系統(tǒng)功能、且可以與其它的系統(tǒng)應(yīng)用進(jìn)行互操作的系統(tǒng) 。 background application is a loop running program, which realizes the input of part program, do some preparatory processes and manages tasks of procedures. 216。software interruption中國電子科技集團(tuán)公司科技與質(zhì)量部 *《 NC Technology 》 E－ mail: Architecture of CNC System Software 216。sharing technology and time overlap flow line technique are mainly used in software designing. 中國電子科技集團(tuán)公司科技與質(zhì)量部 *《 NC Technology 》 E－ mail: Real time process216。apposition （ 資源重復(fù) ）中國電子科技集團(tuán)公司科技與質(zhì)量部 *《 NC Technology 》 E－ mail: Time overlap methodv Time overlap method, based on flow line technique, staggers the processing time of procedures, and makes many procedures use parts of the equipment respectively at the same *《 NC Technology 》 E－ mail: Resource173。 management, which are all real time tasks. 216。zero when reverse the motion, so that the location precision would be improved. 中國電子科技集團(tuán)公司科技與質(zhì)量部 *《 NC Technology 》 E－ mail: Position control中國電子科技集團(tuán)公司科技與質(zhì)量部 *《 NC Technology 》 E－ mail: Managing Software 216。 Speed control subroutine aims at controlling the speed of pulses assigning, . controlling the frequency of interpolation calculation according to the setting speed code (or corresponding speed instruction) to guarantee the preset feed velocity.216。codes and M173。FANUC (Japan)216。 there is a munication work route between each two microprocessors. Interactions within microprocessors and shared resources are achieved via 173。one board architecture中國電子科技集團(tuán)公司科技與質(zhì)量部 *《 NC Technology 》 E－ mail: 中國電子科技集團(tuán)公司科技與質(zhì)量部 *《 NC Technology 》 E－ mail: Multi173。in173。in173。CNC software controls all functions of the machine and its efficiency of operation, and manages all local programming at the machine tool and graphic simulation of the cutting process if available. 216。 4）插補(bǔ)： 插補(bǔ)的任務(wù)是通過插補(bǔ)計算程序在一條曲線的已知起點和終點之間進(jìn)行 “ 數(shù)據(jù)點的密化工作 ” 。從外部特征來看， CNC系統(tǒng)是由 硬件（通用硬件和專用硬件）和軟件（專用） 兩大部分組成的。《 NC Technology 》 E－ mail: ?? Numerical Control Technology ??機(jī)電工程學(xué)院主講： 蔣廷彪 中國電子科技集團(tuán)公司科技與質(zhì)量部 *《 NC Technology 》 E－ mail: Ch4 COMPUTER NUMERICAL