IC693CMM321而DCS以同样的速度来处理开关量和模拟量运算,控制周期的指标确实不理想。新型的DCS控制器学习了大型PLC的设计,在控制周期方面的表现获得了大幅度的提高。以NT6000DCS的T2550控制器为例。控制器可以设置四个不同优先级的任务,最小运算周期可以设为10ms,配合高速I/O卡件,控制周期能够达到15~20ms。而模拟量运算设置在其它周期较长的任务中。
2.2 数据通讯交换数据通讯交换主要是指控制系统网络及其数据交换形式。在这个方面DCS有着先天的优势。集散系统的“分散”主要体现在独立的控制器上,“集中”主要体现在具有完整数据的人机交互装置上,而将分散和集中连接成集散系统的正是网络。因此,从DCS发展的早期,网络就成为了DCS生产厂家的核心技术方向,冗余技术、窄带传输技术都是DCS厂家最早研发或应用成功的。PLC主要是按照独立装置来设计的,其“网络”实际上是串行通讯。
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