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3511 8脈沖輸入模塊
3511 8脈沖輸入模塊
除塵室PLC控制在制藥、水廠等一些對(duì)除塵要求比較嚴(yán)格的車間，人、物進(jìn)入這些場(chǎng)合首先需要進(jìn)行除塵處理，為了保證除塵操作的嚴(yán)格進(jìn)行，避免人為因素對(duì)除塵要求的影響，可以用PLC對(duì)除塵室的門進(jìn)行有效控制。下面將介紹某無塵車間進(jìn)門時(shí)對(duì)人或物進(jìn)行除塵的過程。1. 控制要求 人或物進(jìn)入無污染、無塵車間前，首先在除塵室嚴(yán)格進(jìn)行時(shí)間的除塵才能進(jìn)入車間，否則門打不開，進(jìn)入不了車間。除塵室的結(jié)構(gòu)如圖7-37所示。圖中*道門處設(shè)有兩個(gè)傳感器：開門傳感器和關(guān)門傳感器；除塵室內(nèi)有兩臺(tái)風(fēng)機(jī)，用來除塵；第二道門上裝有電磁鎖和開門傳感器，電磁鎖在系統(tǒng)控制下自動(dòng)鎖上或打開。進(jìn)入室內(nèi)需要除塵，出來時(shí)不需除塵。具體控制要求如下： 進(jìn)入車間時(shí)必須先打開*道門進(jìn)入除塵室，進(jìn)行除塵。當(dāng)*道門打開時(shí)，開門傳感器動(dòng)作，*道門關(guān)上時(shí)關(guān)門傳感器動(dòng)作，*道門關(guān)上后，風(fēng)機(jī)開始吹風(fēng)，電磁鎖把第二道門鎖上并延時(shí)20s后，風(fēng)機(jī)自動(dòng)停止，電磁鎖自動(dòng)打開，此時(shí)可打開第二道門進(jìn)入室內(nèi)。第二道門打開時(shí)相應(yīng)的開門傳感器動(dòng)作。人從室內(nèi)出來時(shí)，第二道門的開門傳感器先動(dòng)作，*道門的開門傳感器才動(dòng)作，關(guān)門傳感器與進(jìn)入時(shí)動(dòng)作相同，出來時(shí)不需除塵，所以風(fēng)機(jī)、電磁鎖均不動(dòng)作。 2. I/O分配 輸入 輸出*道門的開門傳感器 I0.0 風(fēng)機(jī)1 Q0.0 *道門的關(guān)門傳感器 I0.1 風(fēng)機(jī)2 Q0.1 第二道門的開門傳感器 I0.2 電磁鎖 Q0.2 3. 程序設(shè)計(jì) 除塵室的控制系統(tǒng)梯形圖程序如圖7-38所示。4. 程序的調(diào)試和運(yùn)行 輸入程序編譯無誤后，按除塵室的工藝要求調(diào)試程序，并記錄結(jié)果。 水塔水位的模擬控制實(shí)訓(xùn) 用PLC構(gòu)成水塔水位控制系統(tǒng),如圖7-39所示。在模擬控制中，用按鈕SB來模擬液位傳感器，用L1、L2指示燈來模擬抽水電動(dòng)機(jī)。 1. 控制要求 按下SB4，水池需要進(jìn)水，燈L2亮；www.plcs。。ｃｎ直到按下SB3，水池水位到位，燈L2滅；按SB2，表示水塔水位低需進(jìn)水，燈L1亮，進(jìn)行抽水；直到按下SB1，水塔水位到位，燈L1滅，過2秒后，水塔放完水后重復(fù)上述過程即可。2. I/O分配 輸入 輸出 SB1：I0.1 L1：Q0.1SB2：I0.2 L2：Q0.2 SB3：I0.3 SB4：I0.4 3. 程序設(shè)計(jì) |
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