毕业设计 水厂变频恒压供水控制系统的设计,共34页,19935字,附任务书 目录 1绪论.........................................................1 1恒压供水原理及工艺 .......................................1 2 PLC概述及组成................................................2 2.1 PLC的组成................................................2 2.2 PLC工作原理........................................6 2.3 PLC的编程语言........................................9 2.4 PLC的分类.................................................12 2.5 PLC与继电器控制系统的区别..................................14 2.6 PLC控制系统结构............................................15 2.7 PLC网络及特点..............................................17 3系统硬件设计........................................19 3.1供水系统基本构成...........................................21 3.2系统控制要求.....................................24 3.3控制系统的I/O点及地址分配............... .................24 3.4系统选型....................................25 3.5 PLC模拟量控制单元的配置以及应用..........................26 3.4 程序设计.................... .................. ..........21 4 结论........................................................27 5 致 谢......................................................28 6 参考文献 ...................................................29 |
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