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FBM06

FBM06

FBM06

按圖1所示的控制流程，采用逐步得電逐步失電型順序控制系統設計法設計的步進階梯如圖4a所示，其電路結構與圖3的不同點之一是每步的失電由下一步輔助繼電器的常閉接點控制；之二是步1回路必須串聯步2至最后工作步4的輔助繼電器常閉觸點。以防電路工作時，因誤操作再次起動而導致控制順序錯亂。其余的電路結與圖3相同。

    2．輸出階梯設計輸出階梯如圖4b所示，輸出繼電器的控制回路根據控制流程直觀確定。例如，輸出繼電器Y1要求在步1、3得電，則將步1、3的輔助繼電器M1、M3的常開觸點并聯，再與Y1的線圈串聯即可。其余輸出繼電器的控制回路構成方法與此相同。

備貨，備貨，降降降，火火火，火火火……
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