毕业设计（论文）--基于PLC的恒压供水系统设计.doc

毕业设计（论文） 基于PLC的恒压供水系统设计 摘要························································1 第一章 绪论··················································2 1.1全自动变频恒压供水系统可行性分析·····························2 1.2全自动变频恒压供水系统控制原理·······························2 1.3全自动变频恒压供水系统特点及适用范围·························4 第二章 变频恒压供水系统的主要硬件设备·························5 2.1可编程控制器·················································5 2.1.1可编程控制器的介绍·····································5 2.1.2 可编程控制器的特点····································5 2.1.3 可编程控制器PID控制原理与特点························6 2.1.4 PLC的基本结构和工作原理······························8 2.2 4A/D及4D/A扩展模块·······································11 2.2.1模拟量输入模块FX2N-4AD······························11 2.2.2模拟量输出模块FX2N-4DA······························13 2.3变频器······················································14 2.3.1变频器的工作原理及其组成结构·························14 2.3.2 变频控制恒压供水控制方式······························16 2.3.3变频器的系统组成及接口定义···························18 2.4触摸屏··················································18 2.4.1触摸屏的概述········································18 2.4.2触摸屏的工作原理·····································21 第三章 硬件电路设计和软件设计···························21 3.1 硬件电路设计············································21 3.1.1工艺过程···········································21 3.1.2 硬件接线··············································24 3.1.3 控制电路·············································25 3.2 PLC系统选型···········································26 3.3系统控制要求及梯形图程序·································27 第四章 程序的调试········································35 4.1变频恒压供水系统的调试内容·································35 参考文献·················································37 致谢·····················································38 摘要 本设计是针对居民生活用水/消防用水而设计的第一章 绪论 1.1全自动变频恒压供水系统可行性分析 传统的供水方式普遍不同程度的存在浪费水力、电力资源；效率低；可靠性差；自动化程度低等缺点，严重影响了居民用水和工业用水。随着变频技术的发展和人们对生活饮用水品质要求的不断提高，变频恒压供水系统以其环保、节能和高品质的供水质量等特点，广泛应用于多层住宅小区及高层建筑的生活、消防供水中。变频恒压供水的调速系统可以实现水泵电机无级调速，依据用水量的变化自动调节系统的运行参数，在用水量发生变化时保持水压恒定以满足用