IC200TBX120，IC200TBX120，IC200TBX120
基于施耐德plc的水位測(cè)控系統(tǒng)原理及開發(fā)應(yīng)用
水東水電站裝設(shè)有上游、#1攔污柵后、#2攔污柵后、下游四個(gè)水位測(cè)量井，配置浮子式水位測(cè)量裝置，采用絕對(duì)值光電編碼器將水位信息轉(zhuǎn)換成數(shù)字信號(hào)。壩上傳感器距離中控室500m，下游傳感器距離中控室30m，為提高系統(tǒng)的防雷、抗干擾能力，壩上傳感器通信采用光纖傳輸。水位測(cè)控裝置plc通過rs485串行口采集編碼器水位數(shù)據(jù)，經(jīng)過換算處理模擬量輸出模塊輸出4～20ma的上游、下游海拔值信號(hào)至遠(yuǎn)動(dòng)rtu裝置，輸出4～20ma的水頭信號(hào)至機(jī)組調(diào)速器電氣調(diào)節(jié)裝置。計(jì)算機(jī)監(jiān)控系統(tǒng)通過網(wǎng)絡(luò)連接水位測(cè)控裝置plc，采集所有水位信息，故障報(bào)警信號(hào)等，并可遠(yuǎn)程設(shè)置相關(guān)參數(shù)、定值，系統(tǒng)功能結(jié)構(gòu)如圖1所示。
圖1 系統(tǒng)功能結(jié)構(gòu)圖
3 實(shí)現(xiàn)原理
3.1 浮子式水位測(cè)量裝置
該裝置安裝在測(cè)井口上方，當(dāng)液位變化時(shí)，浮子隨之上升或下降，測(cè)繩帶動(dòng)線輪做旋轉(zhuǎn)運(yùn)動(dòng)，與線輪同軸連接的多圈絕對(duì)值編碼器就輸出與液位對(duì)應(yīng)的數(shù)字信號(hào)(見圖2)。裝置具有結(jié)構(gòu)簡(jiǎn)單、合理，可靠性高、適應(yīng)性強(qiáng)等優(yōu)點(diǎn)，能夠長(zhǎng)期用于液位測(cè)量。
圖2 浮子式水位測(cè)量裝置
3.2 編碼器
根據(jù)現(xiàn)場(chǎng)實(shí)際需求，編碼器選用現(xiàn)場(chǎng)總線型輸出的多圈絕對(duì)值編碼器。
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