微机在工业自动化应用中发挥着重要的作用。随着微机应用的不断普及,用户对系统的要求也日益提高。许多自动化应用项目,由于控制对象的分散性,仅用一两台微机构成的系统已无法完成,而需要将几十台甚至更多的微机用通信的方式联系起来,组成一个较大的网络式的控制和管理系统,从而完成信息的采集、处理和控制等功能。这类应用系统的特点是:采集 Microcomputer in industrial automation applications play an important role. With the ever-increasing popularity of computer applications, the user requirements for the system are also increasing. Many automation applications, due to the dispersion of the control object, the system composed of only one or two microcomputers has been unable to complete, and the need to dozens or even more of the computer to communicate with the way to form a larger network Control and management system to complete the information collection, processing and control functions. The characteristics of such applications are: Acquisition