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21pt;">,</span><span style="text-indent: 21pt; font-family: 宋体;">总线接口对整个系统的性能和功能都有直接影响</span><span lang="EN-US" style="text-indent: 21pt;">,</span><span style="text-indent: 21pt; font-family: 宋体;">有关专家预测串行总线将逐渐取代并行总线。在数控系统中</span><span lang="EN-US" style="text-indent: 21pt;">,</span><span style="text-indent: 21pt; font-family: 宋体;">具有开放性的</span><span lang="EN-US" style="text-indent: 21pt;"> PCNC </span><span style="text-indent: 21pt; font-family: 宋体;">数控系统正在取代传统形式的数控系统</span><span lang="EN-US" style="text-indent: 21pt;">,</span><span style="text-indent: 21pt; font-family: 宋体;">并成为市场的主流产品。计算机总线结构的变革</span><span lang="EN-US" style="text-indent: 21pt;">,</span><span style="text-indent: 21pt; font-family: 宋体;">必将影响数控系统的体系结构</span><span lang="EN-US" style="text-indent: 21pt;">,</span><span style="text-indent: 21pt; font-family: 宋体;">串行总线的应用将极大地改变现有的传统数控系统的结构形式。</span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US">1 </span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">串行总线的优点</span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">串行总线连接引脚数量少</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">连接简单</span><span lang="EN-US">,</span><span style="font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">成本较低</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">系统可靠性高。对于高速计算机系统</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">串行总线比并行总线更容易使用。在并行总线中</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">传输数据的各个位必须处于一个时钟周期内的相同位置</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">频率越高</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">对器件的传输性能和电路结构要求越严格</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">系统设计难度加大</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">致使系统成本提高</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">可靠性降低。相比之下</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">使用串行总线时</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">数据的各个位是串行传输的。在串行总线设计时</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">既可以嵌入时钟信号作为同步信号</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">也可以采用锁相环的时钟恢复方式；同并行总线相比</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">串行总线的传输线效应比较容易处理</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">从而降低设计难度和系统成本。</span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US">2 </span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">国外数控系统总线接口的发展概况</span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span style="font-family: 宋体;">在数控系统行业中</span><span lang="EN-US" style="font-family: Tahoma;">,</span><span style="font-family: 宋体;">世界上最大的数控系统生产厂日本</span><span class="apple-converted-space"><span lang="EN-US" style="font-family: Tahoma;"> </span></span><span lang="EN-US" style="font-family: Tahoma;">FANUC<span class="apple-converted-space"> </span></span><span style="font-family: 宋体;">公司推出的</span><span lang="EN-US" style="font-family: Tahoma;">15i/16i/18i/21i<span class="apple-converted-space"> </span></span><span style="font-family: 宋体;">系列数控系统</span><span lang="EN-US" style="font-family: Tahoma;">,</span><span style="font-family: 宋体;">便是一种串行总线结构形式的数控系统。该系列数控系统以其独特的结构、优良的性能引起了关注。</span><span lang="EN-US" style="font-family: Tahoma;">1990<span class="apple-converted-space"> </span></span><span style="font-family: 宋体;">年德国一些著名的</span><span class="apple-converted-space"><span lang="EN-US" style="font-family: Tahoma;"> </span></span><span lang="EN-US" style="font-family: Tahoma;">CNC<span class="apple-converted-space"> </span></span><span style="font-family: 宋体;">系统和伺服系统制造商</span><span class="apple-converted-space"><span lang="EN-US" style="font-family: Tahoma;"> </span></span><span lang="EN-US" style="font-family: Tahoma;">,<span class="apple-converted-space"> </span></span><span style="font-family: 宋体;">例如</span><span class="apple-converted-space"><span lang="EN-US" style="font-family: Tahoma;"> </span></span><span lang="EN-US" style="font-family: Tahoma;">SIEMENS<span class="apple-converted-space"> </span></span><span style="font-family: 宋体;">、</span><span lang="EN-US" style="font-family: Tahoma;">BOSCH</span><span style="font-family: 宋体;">、</span><span lang="EN-US" style="font-family: Tahoma;">AMK<span class="apple-converted-space"> </span></span><span style="font-family: 宋体;">等公司</span><span lang="EN-US" style="font-family: Tahoma;">,</span><span style="font-family: 宋体;">与科研机构共同发起成立了</span><span class="apple-converted-space"><span lang="EN-US" style="font-family: Tahoma;"> </span></span><span lang="EN-US" style="font-family: Tahoma;">SERCOS<span class="apple-converted-space"> </span></span><span style="font-family: 宋体;">协会</span><span lang="EN-US" style="font-family: Tahoma;">,</span><span style="font-family: 宋体;">并制订了串行实时通讯协议</span><span lang="EN-US" style="font-family: Tahoma;">,</span><span style="font-family: 宋体;">以便在德国建立一个统一的</span><span lang="EN-US" style="font-family: Tahoma;">CNC<span class="apple-converted-space"> </span></span><span style="font-family: 宋体;">系统与数字伺服系统接口标准</span><span lang="EN-US" style="font-family: Tahoma;">,</span><span style="font-family: 宋体;">并开发相应的产品。</span><span lang="EN-US" style="font-family: Tahoma;">1992<span class="apple-converted-space"> </span></span><span style="font-family: 宋体;">年</span><span lang="EN-US" style="font-family: Tahoma;">4<span class="apple-converted-space"> </span></span><span style="font-family: 宋体;">月</span><span lang="EN-US" style="font-family: Tahoma;">,</span><span style="font-family: 宋体;">该协议已经被建议作为新的标准和国际标准。目前德国已经被欧洲主要</span><span class="apple-converted-space"><span lang="EN-US" style="font-family: Tahoma;"> </span></span><span lang="EN-US" style="font-family: Tahoma;">CNC<span class="apple-converted-space"> </span></span><span style="font-family: 宋体;">系统和伺服系统制造商所接受</span><span lang="EN-US" style="font-family: Tahoma;">,<span class="apple-converted-space"> </span></span><span style="font-family: 宋体;">引起国际同行业的重视。</span><span lang="EN-US" style="font-family: Tahoma;"><o:p></o:p></span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US">THOMSON </span><span style="font-family:宋体;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">公司已经取得</span><span lang="EN-US"> SERCOS </span><span style="font-family:宋体;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">接口硬件的生产许可</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">生产出</span><span lang="EN-US"> SERCOS </span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">接口控制器</span><span lang="EN-US"> SERCOS410A ASIC </span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">芯片</span><span lang="EN-US">,</span><span style="font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">供</span><span lang="EN-US"> CNC </span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">系统和伺服系统生产厂家使用。</span><span lang="EN-US">1997 </span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">年日本也成立了</span><span lang="EN-US"> SERCOS </span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">协会。</span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US">3 </span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">我国的现状和对策</span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">在我国市场上</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">国外数控系统仍占统治地位</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">传统数控系统还占据着市场的绝大部分份额</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">中国市场成为其落后技术及库存的倾销地。虽然中华Ⅰ型、航天Ⅰ型、华中Ⅰ型等</span><span lang="EN-US"> PCNC </span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">系统相继推出</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">但总体设计仍未摆脱传统数控系统的框架</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">成本较高</span><span lang="EN-US">,</span><span style="font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">目前还难以取代传统数控系统的市场地位。但随着个人计算机及网络技术在数控系统中的应用</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">传统数控系统不可避免地将被更具有竞争力的串行总线计算机数控系统所取代。串行总线计算机数控系统将成为数控系统未来发展的方向</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">对串行总线系统结构的研究应引起我们的高度重视。在学习消化国外先进技术的基础上</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">尽快研究、建立有关的标准和协议</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">选择适用的实时操作系统</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">开发相应的数控软件、串行接口芯片和伺服系统</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">推出我国自主版权的新一代数控系统</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">为参与国际市场竞争打下良好的物质基础。</span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US">4 </span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">结语</span></p> <p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">串行总线计算机数控系统是数控系统的发展方向</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">我们不能完全依赖国外进口</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">应加强对新技术、新方法的研究</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">寻求发展</span><span lang="EN-US">,</span><span style="font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">振兴我国数控系统产业。</span></p> <p class="MsoNormal" align="center" style="margin-top:4.5pt;margin-right:0cm; margin-bottom:7.5pt;margin-left:0cm;text-align:center;line-height:13.5pt; mso-pagination:widow-orphan;mso-outline-level:1"><b><span style="mso-bidi-font-size: 10.5pt;font-family:宋体;mso-bidi-font-family:宋体;mso-font-kerning:0pt">本文由</span></b><span lang="EN-US" style="mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family: 宋体;mso-font-kerning:0pt;mso-bidi-font-weight:bold"> </span><b><u><span style="mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:宋体; mso-font-kerning:0pt">伯特利</span></u></b><b><span style="mso-bidi-font-size: 10.5pt;font-family:宋体;mso-bidi-font-family:宋体;mso-font-kerning:0pt">技术文章 <span lang="EN-US"> </span>整理发表，文章来自网络仅参考学习，本站不承担任何法律责任。<span lang="EN-US"><o:p></o:p></span></span></b></p> <p class="MsoNormal" 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