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2019年3月-6月机械电子工程15级毕业设计（与PLC相关）

可编程控制器是以自动控制技术、微计算机技术和通信技术为基础发展起来的新一代工业控制装置，目前它已被广泛应用于各个领域。可编程控制器是一种数字运算操作的电子系统，专为工业环境下应用而设计。

Programmable logic controllers are now the most widely used industrial process control technology. A programmable logic controller (PLC) is an industrial grade computer that is capable of being programmed to perform control functions. The programmable controller has eliminated much of the hardwiring associated with conventional relay control circuits. Other benefits include fast response, easy programming and installation, high control speed, network compatibility, troubleshooting and testing convenience, and high reliability.

The PLC is designed for multiple input and output arrangements, extended temperature ranges, immunity to electrical noise, and resistance to vibration and impact. Programs for the control and operation of manufacturing process equipment and machinery are typically stored in battery-backed or nonvolatile memory. A PLC is an example of a real-time system since the output of the system controlled by the PLC depends on the input conditions.

The PLC is, then, basically a digital computer designed for use in machine control. Unlike a personal computer, it has been designed to operate in the industrial environment and is equipped with special input/output interfaces and a control programming language. The common abbreviation used in industry for these devices, PC, can be confusing because it is also the abbreviation for “personal computer.” Therefore, most manufacturers refer to their programmable controller as a PLC, which stands for “programmable logic controller.”

 

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PLC控制与编程基础

本章讲解的输入输出元件，是作为基础知识回顾和补漏，主要包括一些和PLC控制相关的控制元件。

主要内容（10.12 课程自习PPT下载）

输入输出元件

PLC工作原理

PLC编程语言

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PLC的系统组成

CPM1A的基本组成

CPM1A继电器区及数据区

CPM1A功能简介

CPM2A简介

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PLC指令系统

以指令为基础，讲解PLC控制系统编程方法、技巧、思想、基本例程以及相关注意事项。

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PLC控制系统的设计

控制系统设计的方法，各方法举例。

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PLC通讯系统

通讯系统

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