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在工農(nóng)業(yè)生產(chǎn)過程中,常見、廣泛的就是對液位的測量和控制.它主要應(yīng)用于水塔、鍋爐、高層水箱、工業(yè)化工槽、水電站等情況下的液位監(jiān)控.液位控制的與否直接影響產(chǎn)品質(zhì)量,甚至?xí)υO(shè)備造成重要影響,所以液位的監(jiān)控具有廣泛的應(yīng)用前景.我們知道水位的監(jiān)測有很多種實現(xiàn)方法,如機(jī)械控制、機(jī)電控制、邏輯電路控制等.但通常情況下,需要測量的水塔或水箱和控制室距離相當(dāng)長,常需要設(shè)置上百或上千米的輸電和控制電路,且多為人工控制.顯然,這種測量方法控制低,危險性高,能耗大,給監(jiān)控帶來一定的麻煩和不便.該設(shè)計系統(tǒng)中涉及兩個方面的內(nèi)容:(1)通過PLC實現(xiàn)水位的控制作用.(2)以工控機(jī)為控制平臺,使用MCGS組態(tài)軟件對該系統(tǒng)進(jìn)行控制監(jiān)測及故障報警等.實驗采用新型的PLC控制供水方式進(jìn)行主控制,在水箱上安裝一個自動測液位裝置,用一般水的導(dǎo)電性連續(xù)對液位進(jìn)行檢測,把測量到的液位變化轉(zhuǎn)化成相應(yīng)電信號,主控臺對接收到的電信號應(yīng)用MCGS組態(tài)軟件進(jìn)行處理,完成相應(yīng)的液位監(jiān)測控制及故障報警等功能.這種設(shè)計既不需要架設(shè)電纜,節(jié)省人力物力,又能穩(wěn)定可靠地的實現(xiàn)對水位的監(jiān)控,且因為PLC強(qiáng)大的擴(kuò)展性可以滿足今后日常生活供水建設(shè)的發(fā)展需要.
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工業(yè)生產(chǎn)一般對控制設(shè)備的可靠性要求很高,并且要有很強(qiáng)的抗干擾能力。PLC能在惡劣的環(huán)境中可靠的工作,平均無故障時間達(dá)到數(shù)萬小時以上,已被公認(rèn)為*可靠的工業(yè)控制設(shè)備之一。
PLC本身具有較強(qiáng)的自診斷功能,保證硬件核心設(shè)備(CPU、存儲器、I/O總線等)在正常情況下執(zhí)行用戶程序,一旦出現(xiàn)故障則立即給出出錯信號,停止用戶程序的執(zhí)行,切斷所有輸出信號,等待修復(fù)。PLC的主要模塊均采用大規(guī)模和超大規(guī)模集成電路,I/O系統(tǒng)設(shè)計有完善的通道保護(hù)與信號調(diào)理電路。在結(jié)構(gòu)上對耐熱、防潮、防塵、抗震等都有的考慮,在硬件上采用隔離,屏蔽、濾波、接地等抗干擾措施,在軟件上采用數(shù)字濾波等措施。與繼電器系統(tǒng)和通用計算機(jī)相比,PLC更能適應(yīng)工業(yè)現(xiàn)場環(huán)境要求。
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在工農(nóng)業(yè)生產(chǎn)過程中,常見、廣泛的就是對液位的測量和控制.它主要應(yīng)用于水塔、鍋爐、高層水箱、工業(yè)化工槽、水電站等情況下的液位監(jiān)控.液位控制的與否直接影響產(chǎn)品質(zhì)量,甚至?xí)υO(shè)備造成重要影響,所以液位的監(jiān)控具有廣泛的應(yīng)用前景.我們知道水位的監(jiān)測有很多種實現(xiàn)方法,如機(jī)械控制、機(jī)電控制、邏輯電路控制等.但通常情況下,需要測量的水塔或水箱和控制室距離相當(dāng)長,常需要設(shè)置上百或上千米的輸電和控制電路,且多為人工控制.顯然,這種測量方法控制低,危險性高,能耗大,給監(jiān)控帶來一定的麻煩和不便.該設(shè)計系統(tǒng)中涉及兩個方面的內(nèi)容:(1)通過PLC實現(xiàn)水位的控制作用.(2)以工控機(jī)為控制平臺,使用MCGS組態(tài)軟件對該系統(tǒng)進(jìn)行控制監(jiān)測及故障報警等.實驗采用新型的PLC控制供水方式進(jìn)行主控制,在水箱上安裝一個自動測液位裝置,用一般水的導(dǎo)電性連續(xù)對液位進(jìn)行檢測,把測量到的液位變化轉(zhuǎn)化成相應(yīng)電信號,主控臺對接收到的電信號應(yīng)用MCGS組態(tài)軟件進(jìn)行處理,完成相應(yīng)的液位監(jiān)測控制及故障報警等功能.這種設(shè)計既不需要架設(shè)電纜,節(jié)省人力物力,又能穩(wěn)定可靠地的實現(xiàn)對水位的監(jiān)控,且因為PLC強(qiáng)大的擴(kuò)展性可以滿足今后日常生活供水建設(shè)的發(fā)展需要.
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