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（6）發起真空泵電機，乳化鍋負壓力不斷變大，畢竟將到達用戶設定值；到達用戶設定值后真空泵電機主動間斷；
（7）發起乳化鍋溫度控制，主動對乳化鍋進行加熱控制，控制方法選用含糊PID恒溫控制，乳化鍋內材料將被加熱到用戶設定溫度；
（8）當乳化工作結束后，通過排氣口減小乳化鍋內負壓力，當乳化鍋壓力為零時，翻開出料閥，排出乳化品。
1 導語
可編程控制器是專門為工業控制計劃的，在計劃和制造進程中廠家采用了多層次抗煩擾方法，使系統能在惡劣的工業環境下與強電設備一同工作。工作的安穩性和可靠性很高，plc整機均勻無缺點工作時間高達幾萬小時。跟著計算機技術的展開，plc的功用也越來越強，運用越來越便利，因而在工業控制系統中運用日益廣泛。但是，整機的可靠性高僅僅保證系統可靠工作的條件，還有必要在計劃和設備plc系統進程中選用相應的方法，才華保證系統可靠工作。這篇文章首要論述在計劃和設備plc系統進程中的煩擾方法。
2 plc系統的底子構成構造
可編程控制器硬件系統由plc主機、功用i/o單元和外部設備構成，如圖1所示。其間plc主機由cpu、存儲器、底子i/o模塊、i/o拓展接口、外設接口和電源等有些構成，各有些之間由內部系統總線聯接。
3 plc系統計劃時的抗煩擾方法
3.1 硬件方法
（1） 屏蔽：對電源變壓器、基地處理器、編程器等首要部件，選用導電、導磁性出色的材料進行屏蔽處理，以避免外界煩擾信號的影響。

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