基于plc双电源开关毕业论文.doc

目 录
摘要…………………………………………………………………………………………………I
Abstract……………………………………………………………………………………………II
第1章 绪论………………………………………………………………………………………
1.1引言…………………………………………………………………………………
1.2设计的要求………………………………………………………………………………
1.2.1 设计的基本原则
1.2.2 设计的主要内容
1.2.3 PLC控制系统的一般设计步骤
第2章 基于PLC双电源开关总体方案设计………………………………………………
2.1 引言………………………………………………………………………………………
2.2 设计要求…………………………………………………………………………
2.3 总体方案的确定………………………………………………………………………
第3章 基于PLC双电源开关控制系统硬件设计………………………………………
3.1 引言
3.2 电气控制方案设计
3.3 PLC型号的选择………………………………………………………………………
3.4 特殊功能模块的选择………………………………………………………………
3.4.1 技术参数……………………………………………………………………
3.4.2 FX2N-4A/D模块的接线方式……………………………………………
3.4.3 缓冲寄存器及设置………………………………………………………
3.4.4 检测参数设置……………………………………………………………
3.3  I/O口设计……………………………………………………………………………
3.4 系统外部连线电路设计……………………………………………………………
第4章 基于PLC双电源开关控制系统软件设计
4.1 引言……………………………………………………………………………
4.2 PLC控制系统程序设计主要步骤……………………………………………
4.3 流程图设计…………………………………………………………………
4.4 梯形图设计…………………………………………………………………
4.5 PLC程序语句表…………………………………………………………………

基于PLC双电源开关设计

摘要：随着人们对供电可靠性要求越来越高，很多场合需要用两路电源来保证供电的可靠性，这就需要一种双电源切换器在两路电源之间进行可靠切换。采用可编程控制器(PLC)解决这类问题具有独特的优势，在电气自动化方面具有广阔的应用前景和很大的市场潜力。与传统继电控制系统相比较，可编程控制器(PLC)的优势在于：体积小型化，高度集成，同时还有数字运算、数据处理和数据通讯功能。PLC作为新一代的工业控制装置，结构简单、性能全面、可靠性高。本课题是基于可编程控制器的双电源开关设计，用以实现双电源开关的自投自复，缺相和欠压保护，使之可以适应用电要求较高企业的需求。本文分析了基于PLC的双电源开关的设计理念，设计方法，主要阐述了系统硬件、软件的设计。

关键词：双电源切换；PLC；数据处理；缺相和欠压保护

PLC-based design of dual-power switch

Abstract: With increasing demands for high reliability, a number of occasions the need to use two power supplies to ensure reliability of electricity supply, which requires a dual power switch between the two reliable switching power supply. The use of programmable logic controller (PLC) to solve this problem has a unique advantage in electrical automation applications have broad prospects and great market potential. Relay control system with the traditional, compared to programmable logic controller (PLC) has the advantage of being: the volume of smaller, highly integrated, but also the number of computing, data processing and data communication functions. PLC as a new generation of industrial control devices, simple structure, the performance of a comprehensive, high reliability. This topic is based on the programmable logic controller design of dual-power switch, dual power switch for the automatic switch from the complex, lack of phase and under-voltage protection, so that electricity can be adapted to the needs of demanding enterprises. This paper analyzes the PLC-based dual-power switch design, design methods, mainly on the system hardware and software design.

Key words: dual-power switch; PLC; data processing; missing phase and undervoltage protection