以PID模块为例,其中的基本数据有PV、SP、OP,采用数据表的传输方式,你必须先定义PV、SP、OP的数据地址为01、02、03,其它的站也以数据表的方式接收数据,但是01是什么数据?02是什么数据?必须通过数据定义表才能还原。数据表的管理方式烦琐易错,一个大型系统的上万点数据采用这个方式,平铺在数据表中进行管理,是非常可怕的。而NT6000DCS以模块为单位的结构化管理,将一个PID作为一个模块进行处理,要访问其PV值,首先访问其模块,以PID.PV的形式来管理。这就将所有平铺的数据,分类归属集中到一个个小盒子中,按模块.分量的方式进行管理,管理的效率大大提高。
PLC数据通讯交换的问题,主要源于PLC长期以来做为一个独立装置在发展,没有系统概念;而且主要应用在小型控制系统中,问题暴露得并不明显,所以发展较慢。目前也有一些大型PLC在这个方面有所提高,但是要达到DCS的水平还需要一个相当长的过程。
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