PC-ACR8020-03

描述

PC-ACR8020-03

目前计算机控制系统已经基本上实现开放，主要归功于DCS的操作站和控制器都采用以PC机为基础的硬件结构。操作站的操作系统采用Windows NT/2000，用户希望能制订一套像IEC 61131那样的编程标准。因为控制器的编程环境如具备IEC 61131标准，能给用户在控制器组态方面提供很大方便。
对于DCS来说，除操作系统以外，在系统中所用软件可分为3大部分：(1)标签数据库：包括读取系统的输入和输出、控制回路，数据库功能的扩展，OPC数据的通信；(2)显示：包括显示动态流程图、趋势、报警；(3)控制器组态平台：这部分被称为工程师站软件，目前已经有IEC 61131标准。
标签数据库和显示软件安装在人机界面中。现在各家软件公司对标签的定义是自己规定的，显示的部件和标签数据库及属性的描述也是各家自己定义的，所以给用户造成极大不便，用户要花费很多时间来掌握这些组态技巧，学习繁琐的工具手段，而不是把时间用在该用的地方，去进行优化控制。
在用户系统升级时，操作站的各项工作都要重来，如作图、文本，没有继承性可言，每次都要重作。如在更换系统时，也是重新作图，即使只更换操作站，其工作量也很大。其实，控制系统更换了，现场的被控对象并没有变化，阀门还是阀门，变送器还是变送器，管道还是管道。总的来说，被控对象是不变的，只不过各个系统的监控软件对它们的描述改变了。即便是新建的项目，用的变送器、阀门也是一样的，只要对它们的描述规定了，老的基建项目有部分图形在新项目中还是可以用的。即使是部分继承，也能节省许多人力。另外，浪费更大的还是在新老人员交接的时侯，新人都要重新学习一遍，经过几年以后才能走向正规。如果老技术人员是在一个标准的环境下工作，他们的工作很容易传给新一代的技术人员，而不必在低水平上重复。
需要制订标准的另外一个原因是，由于DCS、PLC要与企业局域网相联，如果现在有几十种监控软件，相互之间需要转换，编写转换软件需要有上百个。因为现在的软件是“所见即所得”的，它带来了很大麻烦。这种软件对于转换来说，它不是表意的。如果我们采用XML(Extensible Markup Language)方法，它使得开发人员能够创建以逻辑内容而不是以格式为基础的标记结构。这将使人和计算机能够更容易地在文档内搜索具体的基于内容的信息，而不是仅仅搜索一个页面的文本。采用XML方法，可以作到部分表意。因此，就不需要编写那么多软件。

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