【文章內(nèi)容簡介】 .......................................................... 29 控制算法在恒壓供水系統(tǒng)中的應(yīng)用 ........................................................ 29 小結(jié) ............................................................................................................ 30 第 4 章 供水系統(tǒng) PLC 軟件設(shè)計 ............................................................................. 32 系統(tǒng)水泵運行狀態(tài)及轉(zhuǎn)換過程分析 .......................................................... 32 供水系統(tǒng)程序設(shè)計 ...................................................................................... 33 供水系統(tǒng)程序流程圖設(shè)計 ................................................................ 33 供水系統(tǒng)主程序設(shè)計 ........................................................................ 35 供水遠(yuǎn)程監(jiān)控 系統(tǒng)設(shè)計 .............................................................................. 38 監(jiān)控系統(tǒng)硬件構(gòu)成 ............................................................................ 38 PLC 通信程序設(shè)計 ........................................................................... 39 計算機(jī)通信程序設(shè)計 ........................................................................ 40 小結(jié) .............................................................................................................. 41 結(jié) 論 ....................................................................................................................... 42 致 謝 ....................................................................................................................... 43 參考文獻(xiàn) ................................................................................................................... 44 附 錄 ....................................................................................................................... 45 XIV CONTENTS Abstract（ Chinese） ................................................................................................. I Abstract .................................................................................................................... XI Chapter1 Introduction .............................................................................................. 1 Topic source and research significance .......................................................... 1 Topic source ......................................................................................... 1 Research significance ........................................................................... 2 Domestic water system frequency research situation and development trend...................................................................................................................... 2 Domestic water system frequency........................................................ 2 Frequency conversion water supply system development trend .......... 4 Research objects and research content ........................................................... 4 Research object .................................................................................... 4 The main research contents .................................................................. 5 Chapter2 The main circuit design water system .................................................... 6 The choice of the ways of water..................................................................... 6 System scheme selection ................................................................................ 6 The main circuit design water system ............................................................ 8 Main circuit design ............................................................................... 8 Pump motor ........................................................................................ 10 Inverter ............................................................................................... 13 Ac contactor ....................................................................................... 15 Overload protection ............................................................................ 16 Stepdown start and selection of the transformer ............................... 18 The water saving speedregulating operation............................................... 18 Summary ...................................................................................................... 20 Chapter3 Water supply system control circuit design ......................................... 21 Water supply system control diagram design ............................................... 21 Water supply system control diagram design ..................................... 21 Water supply system operation indicator diagram design .................. 22 XV PLC and its extension module selection ...................................................... 23 PLC selection ..................................................................................... 23 Analog input and output module selection ......................................... 24 Data munication module ............................................................. 24 PLC distribution of I/O terminals and Inverter wiring................................. 24 PLC distribution of I/O terminals ...................................................... 24 Inverter wiring .................................................................................... 26 Pressure transmitter selection ....................................................................... 26 Intermediate relay type of Control circuit .................................................... 27 The isolated transformer selection of PLC................................................... 27 Phase/frequency discriminator selection ...................................................... 28 Pour pump function in the constant pressure water supply system application .........................................................................