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1引言可编程控制器（简称PLC）是集计算机技术、自动控制技术和通讯技术为一体的可靠性高、易于编程使用并对环境要求低的新型工业控制装置。国际电工委员会（IEC）对PLC的定义是：可编程控制器是一种专为工业环境下应用而设计的数字运算的电子系统。它采用可编程序的存贮器，
1 Introduction Programmable controller (referred to as PLC) is a set of computer technology, automatic control technology and communications technology as one of the high reliability, ease of programming and the environmental requirements of new industrial control devices. The International Electrotechnical Commission (IEC) defines a PLC as a programmable electronic controller that is designed for digital applications in industrial environments. It uses programmable memory,