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可编程控制器(PLC)是一种数字运算操作的电子系统,专为在工业环境下应用而设计。西门子PLC以性能强大、使用方便的巨大优越性,已广为工程技术人员所熟知。Java语言是业界公认的优秀编程语言,功能十分强大,已经在许多领域有重要应用。近年来,Java语言在串口通信程序设计方面,也有了重要应用。以西门子公司生产的S7-200型PLC为基础,给出了PLC与计算机通讯时上位机和下位机之间相应的简单程序。
Programmable Logic Controller (PLC) is a digital computing operation of the electronic system, designed for industrial applications and design. Siemens PLC with powerful, easy to use great advantages, has been widely known to engineers. Java language is recognized as an outstanding programming language in the industry. It is very powerful and has important applications in many fields. In recent years, the Java language also has important applications in the design of serial communication programs. Based on S7-200 PLC produced by Siemens Company, the corresponding simple procedure between upper computer and lower computer is given when PLC and computer communicate.