PLC(可编程序控制器)是以微处理器为核心,综合了计算机技术、自动控制技术和通信技术而发展起来的一种通用工业自动控制装置。具有控制功能强,可靠性高,使用灵活方便,易于扩展等优点而应用越来越广泛。在冶金、交通、化工、电力等领域获得了广泛的应用,被成为现代工业技术的三大支柱之一。 PLC (Programmable Logic Controller) is a general-purpose industrial automatic control device which is developed based on the microprocessor as the core and integrated with computer technology, automatic control technology and communication technology. With control functions, high reliability, flexible and convenient to use, easy to expand, and more and more widely used. In metallurgy, transportation, chemical industry, power and other fields has been widely used, has become one of the three pillars of modern industrial technology.