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　　SIMATIC S7-200 SMART 集成以太網(wǎng)接口，實現(xiàn)低成本與編程設備的通訊、強大的集成工藝功能，有效的解決方案，滿足自動化需求、和靈活的可擴展性、安裝簡單方便、可拆卸的端子、緊湊的結(jié)構(gòu)可大大節(jié)省了控制柜安裝占用空間等特點。因此系統(tǒng)采用了 SR40 CPU AC/DC/RLY 的 PLC 作為控制中樞，其電源為 AC220V，節(jié)省了電源模塊、數(shù)字量輸入為 DC24V 24 點，可直接與輸入點連接、16 點輸出為繼電器輸出，干觸點電壓為 5~30VDC 或 5~250VAC,電磁閥的線圈和接觸器的線圈供電電壓為 AC220V，故可直接與 PLC 輸出電路連接，使系統(tǒng)簡單可靠。
　　SMART LINE 觸摸屏準確地提供了人機界面的標準功能，經(jīng)濟實用，具備高性價比。具有集成以太網(wǎng)接口，實現(xiàn)低成本與 PLC 控制設備的通訊，方便，快捷，強大的通訊功能，64K 色真彩顯示，800 X 480 dpi 寬屏顯示設計和傳統(tǒng)屏幕相比具有更大的可視面積，使單個畫面中可以顯示更多的信息，讓操作員具有更舒適的視覺體驗，高分辨率使畫面更清晰，畫質(zhì)更細膩。
　　控制系統(tǒng)工藝分析如下：
　　1. 在檢查完無故障的情況下，啟動設備。設備自動運行完成各個過程。
　　2. 加壓延時過程，此時打開排氣電磁閥。
　　3. 加壓過程，關閉排氣閥，打開充氣閥。檢測壓力值是否正常，取模擬量值跟設定值做 對比，若壓力值過低，則低壓報警，同時停止加壓過程，關閉充氣閥，打開排氣閥。
　　4. 平衡延時過程，關閉充氣閥。檢測壓力值是否正常，去模擬量值跟設定值做比較，若超出設定值，則報警輸出，同時結(jié)束平衡延時過程，打開排氣閥。
　　5. 檢出過程，此時取模擬量值跟設定值做比較，若超出設定值，則報警輸出，同時結(jié)束檢出過程，打開排氣閥。
　　6. 結(jié)束延時過程，打開排氣閥，延遲時間結(jié)束，關閉排氣閥。
　　由于使用了 SMART LINE 觸摸屏，設備界面更加美觀，大方，也大大提高了操作的靈活性。下圖為觸摸屏操作界面。
　SIMATIC S7-200 SMART 自動控制系統(tǒng)與開關按鈕系統(tǒng)比較，增加了監(jiān)控功能，具有可靠性強、安全性好、準確性高等優(yōu)點，可節(jié)省人員的編制，大大減少因人為的誤操作或開關損壞而造成的故障，從而提高了工作效率，并相對提高了社會經(jīng)濟效益，是一種有效而實用的自動控制系統(tǒng)。
　　通過終端用戶的使用， 證明了氣密測漏機控制系統(tǒng)用 PLC 控制的方法是切實可行的。氣密性檢測裝置采用 SIMATIC S7-200 SMART PLC 控制器能大大地提高系統(tǒng)的可靠性和極大地提高了設備自動化程度，并使操作程序更加簡便，客戶較為滿意。

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