基于PLC的生活热水控制系统(修改版)

摘要

近些年来我国城市建设发展十分迅速，同时也对基础设施建设提出了更高的要求。小区、学校、营房等集体单位的恒压供热水系统建设是其中的一个重要方面，供水的可靠性、稳定性、经济性直接影响到用户的正常工作和生活。本次设计利用先进的自动化技术、控制技术以及通讯技术，设计出能适应小区、学校、营房等集体单位复杂环境的恒压供热水系统，该系统拥有自动注水、加热、供水和达到警戒水位自动报警等功能。

本课题主要针对生活用水控制系统进行研究，并制作控制系统以实现自动注水、自动加热、自动供水三个过程。该系统以可编程逻辑控制器(PLC)为控制核心，以触摸屏为操作平台．利用各类传感器检测液位、压力、温度等信息，同时根据制定的控制策略来自动调节变频器的输出频率和定频水泵的启停，实现供水的自动化。

关键词：可编程逻辑控制器，变频调速，设计

ABSTRACT

In recent years, China's economic development, social construction and urban construction and development is very fast, but also to the infrastructure construction proposed higher requirements. The construction of urban heating water system is one of the important aspects, the reliability, the stability and the economy of the water supply directly affect the user's normal work and life.. With the people continuously improve the quality and reliability of water supply system, using advanced automation technology, control technology and communication technology design of high performance, high energy saving, can adapt to the water supply factory complex environment of constant pressure water supply system to become an inevitable trend.

This thesis mainly studies the water control system of domestic water, and makes the control system to realize automatic water injection, automatic heating, automatic water supply three processes. The system on a programmable logic controller (PLC) for the control of the core, the touch screen as the operating platform. Using all kinds of sensor to measure liquid level, pressure, temperature and other information, also according to the formulation of control strategy is used to automatically adjust the output frequency of a frequency converter and constant frequency of the pump start and stop, to achieve the water supply to the automation.

KEY WORDS：PLC，Frequency conversion speed control，Design

目录

摘要......................................................................................................................... I ABSTRACT ..................................................................................................................................... II 第一章绪论. (1)

1.1 引言 (1)

1.2系统功能设计 (1)

第二章生活热水控制系统的总体设计 (3)

2.1 生活热水控制系统构成方案 (3)

2.2 生活热水控制系统的控制方案 (4)

2.3 本章小结 (5)

第三章系统的硬件原理设计 (6)

3.1 系统整体硬件设计 (6)

3.1.1 控制器及各扩展插件设计 (6)

3.1.2 触摸屏的选型 (7)

3.1.3 热泵机组选型 (7)

3.1.4 变频器选型 (9)

3.1.5传感器的选择 (9)

3.1.6供水机组的选型 (10)

3.2 I/O地址分配 (11)

3.3 系统硬件线路设计 (12)

3.4 本章小结 (15)

第四章生活热水控制系统软件的设计 (16)

4.1 编程方法 (16)

4.2 编程软件的简单介绍 (16)

4.3 PLC功能设计 (16)

4.4 手动模式设计 (18)

4.5 自动模式设计 (18)

4.5.1 自动注水阶段 (19)

4.5.2 自动加热阶段 (20)

4.5.3 自动供水阶段 (21)

4.6 触摸屏设计 (22)

第五章总结与期望 (23)

5.1 总结 (23)

5.2 展望 (23)

致谢 (24)

参考文献 (25)