1、摘要 随着 PLC 应用技术的日益普及推广,PLC 已经成为工业控制领域推广速度最快、应 用范围最广的一种控制设备,于是各高校机电类专业都开设了与此相关的课程。由于 PLC 采 用梯形图的编程语言是以继电器梯形图为基础的形象编程语言,所以很多工厂,在用 PLC 进行系统改造时,常常将原有的继电器图直接翻译成 PLC 梯形图。本文针对用 PLC 代替继电器系统的设计方法进行总结,并进行案例解析。提出了用超小型 PLC 代替继电器 开关量控制“实现对断路器二次回路的控制“并通过对其硬件接线图程序状态转移图和逻 辑图的分析“阐明了 PLC 控制的优点。 【关键词】继电器控制系统 PLC 梯形图 断路
2、器 二次回路 状态转移图 逻辑图 2 Abstract Pick to along with the PLC application technology daily popularization, PLC has become the field of industrial control to promote the fastest, should use the widest range of a control device, so each college of Electromechanical Specialty set up related courses. Because P
3、LC mining with ladder diagram programming language is a relay ladder diagram based image programming language, so many factories, in the PLC system, often the original relay diagrams directly translated into PLC ladder diagram. This paper use PLC instead of relay system design methods are summarized
4、, and a case analysis. Presents a subminiature PLC instead of relay switch quantity control“ of two circuit breaker control“ through the wiring diagram of the hardware program state transfer diagram and logic diagram analysis“ explained PLC control advantages Key words relay control system PLC ladder breaker two loop state transfer diagram logic diagram 3 目录目录 摘要 . 1 Abstract . 2 第 1 章、绪论 . 4 1.1 课题背景 . 4 1.2 课题目的 . 4 1.3 课题意义 . 4 第 2 章 PLC 及发展 . 5 2.1 阐述和分析二次回路的工作原理和运行方式 . 5 2.2 比较原有控制方式和 P
