前言在一些生产过程中,以往常常应用继电器、接触器和各种电器设备按照生产工艺的需要设计出各种继电控制系统以实现自动化,但它存在着线路复杂、体积大、耗电大和维修不便等缺点。随着电子技术的发展,于六十年代末,世界上出现了集成电路的顺序控制器(简称顺检器),它可分为矩阵式顺 Preface In some production processes, the past often used relays, contactors and various electrical equipment in accordance with the needs of the production process design a variety of relay control system for automation, but it exists the line complexity, size, power consumption and maintenance Inconvenience and other shortcomings. With the development of electronic technology, in the late 1960s, there appeared a sequence controller (referred to as a sequence checker) of an integrated circuit in the world, which can be divided into a matrix type