基于GPRS的遠(yuǎn)程溶解氧和溫度測量系統(tǒng)

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摘要 隨著科技的發(fā)展，將傳統(tǒng)的現(xiàn)場總線技術(shù)、無線通訊技術(shù)、智能儀表、自動控制技術(shù)結(jié)合起來已經(jīng)成為一種趨勢。本文對比分析了國內(nèi)外對該項(xiàng)技術(shù)的研究現(xiàn)狀和發(fā)展趨勢，提出了一種基于GPRS和PLC的遠(yuǎn)程無線監(jiān)控系統(tǒng)。
文章首先敘述了國內(nèi)外關(guān)于此項(xiàng)研究的發(fā)展?fàn)顩r，總結(jié)我國和同期國外在技術(shù)及應(yīng)用普及方面的差距，然后對整個系統(tǒng)的研究總體思路進(jìn)行介紹，并分別對硬件設(shè)計(jì)中的各個模塊展開闡述和分析論證。其中，設(shè)計(jì)的信號調(diào)理電路把傳感器的小信號轉(zhuǎn)換為0-2.5v的電壓信號；選用S7-200PLC(CPU226)作為控制終端的核心處理器。EM235模塊實(shí)現(xiàn)模擬量的輸入輸出，TD400C模塊實(shí)現(xiàn)現(xiàn)場的人機(jī)交互。PLC以自由口方式與GPRS模塊進(jìn)行連接；PLC編程實(shí)現(xiàn)溶解氧的閉環(huán)控制，通過變頻器實(shí)現(xiàn)對增氧泵的無極調(diào)速。服務(wù)器采用PC利用GPRS實(shí)現(xiàn)多控制終端與若干個遠(yuǎn)程控制端間的指令與數(shù)據(jù)傳輸；
本系統(tǒng)已進(jìn)行初步的測試，對實(shí)際測試的效果進(jìn)行分析可知：無線通訊、PLC技術(shù)、PC等各種技術(shù)的結(jié)合，可以將現(xiàn)場的各種情況通過無線通訊設(shè)備傳輸?shù)椒?wù)器，實(shí)施對水質(zhì)環(huán)境的實(shí)時無縫監(jiān)控，能有效地避免水環(huán)境的污染，進(jìn)行早期預(yù)警，并且防止無謂的經(jīng)濟(jì)損失。設(shè)計(jì)開發(fā)的監(jiān)控系統(tǒng)擁有開放性高，可移植性強(qiáng)的優(yōu)點(diǎn)，并留有充分的升級空間，可以方便的應(yīng)用到智能家居、海洋監(jiān)測、工礦業(yè)等方方面面，具有非常廣闊的發(fā)展前景。
關(guān)鍵詞：無線通訊，PLC，水質(zhì)遠(yuǎn)程監(jiān)控。


The remote dissolved oxygen and temperature measurement
system based on GPRS
ABSTRACT With the development of technology, the traditional field bus technology, wireless communication technology, smart instrumentation, automatic control technology together has become a trend. This paper analyzes the comparative study of the current status and development trend of the technology at home and abroad , and proposes a remote wireless monitoring system based on GPRS and PLC.
The article first describes the study on domestic and international developments , summarizes the gap between country and abroad in terms of popularity in the technology and application of the same period , then the study of the general idea of the whole system are introduced , and were on the hardware design of the various modules expand elaborated and analysis of argumentation . Among them, the signal conditioning circuit design of the small signal of the sensor is converted to a voltage signal 0-2.5v ; S7-200PLC (CPU226)was choosen as a control terminal core processor. EM235 module for analog input and output , TD400C module to achieve human-computer interaction site . PLC connects with GPRS module as free port ; PLC achieves loop control of dissolved oxygen using programming, stepless speed for oxygen pump through the inverter . PC server uses GPRS to achieve transmission of control commands and data between terminal and several remote control terminal ;
The system has been carried out preliminary tests ,the actual test results analysis shows :with the combination of wireless communications , PLC technology , PC and other technologies , the kinds of condition in field can be transmitted to the server with the wireless communication devices,causing the real-time seamless monitoring for water quality , and effectively avoiding pollution of water environment , early warning , and preventing unnecessary economic losses. The monitoring system we have designed and developmented has a high openness , portability of benefits, and allows sufficient space for the upgrade , you can easily apply it to the smart home , marine monitoring , engineering and mining aspects , it has a very broad prospects for development .
Key words wireless communications , PLC, remote monitoring of water quality .

目錄
摘要 I
ABSTRACT II
目錄 Ⅲ
第一章 緒論 1
1.1水質(zhì)監(jiān)控系統(tǒng)概述 1
1.2研究的背景、目的和意義 1
1.3國內(nèi)外研究現(xiàn)狀和發(fā)展趨勢 2
1.3.1國外研究現(xiàn)狀和發(fā)展趨勢 2
1.3.2 國內(nèi)研究現(xiàn)狀和發(fā)展趨勢 3
1.4本文結(jié)構(gòu)和主要工作 5
第二章 課題研究思路 6
2.1 系統(tǒng)整體研究思路 6
2.2系統(tǒng)硬件整體概述 6
2.3 重要模塊研究思路 7
第三章 系統(tǒng)硬件設(shè)計(jì) 8
3.1信號采集模塊 8
3.1.1 傳感器 10
3.1.2 調(diào)理電路 10
3.2 指令執(zhí)行模塊 12
3.3 終端控制器 13
3.3.1 西門子S7-200 PLC 13
3.3.2 TD400C和EM235模塊 14
3.4 無線傳輸模塊及遠(yuǎn)程控制設(shè)備 16
第四章 軟件設(shè)計(jì) 18
4.1終端控制器軟件的設(shè)計(jì) 18
4.1.1 模擬量采集 19
4.1.2 溶解氧的PID控制 23
4.1.3 PLC人機(jī)界面設(shè)計(jì) 26
4.1.4 PLC通訊 27
4.2 GPRS通訊設(shè)置 30
4.3遠(yuǎn)程控制端的監(jiān)控軟件 31
第五章 系統(tǒng)試驗(yàn)結(jié)果 34
5.1 監(jiān)控畫面 34
5.2 儀器檢測 35
第六章 總結(jié)展望 38
6.1 本文總結(jié) 38
6.2 未來展望 38
致謝 40
參考文獻(xiàn) 41