摘要： 目前世界上工业过程控制普遍采用的先进的模式是集散控制（集中管理分散控制），即在中央控制室或总控制台用一台ＩＢＭ　ＰＣ作为上位机与在工业现场单独执行控制任务的下位机可编程控制器（ＰＬＣ）进行联网通信。该文介绍了使用ＶＢ（Ｖｉｓｕａｌ Ｂａｓｉｃ）编写联网通信用户界面程序时的关键技术。

关键词: 计算机控制, 数据通信, 通信协议

Abstract: At present, the advanced industrial automatic control mode distributed control system is widely used in the world. That is to say in centre control room or in main control station there is a personal computer (IBMIPC) used as master computer, and in worksites one or several programmable controller (PLC) are used as slave computer to control different machines independently. Then PC communicates the master computer with each slave PLC separately. This paper introduces the key technology of using VB language to program user interface of the data communication.

中图分类号: 

• TP311