6AV6545-4BB16-0CX0觸摸屏_漳州鼎晟達自動化設備有限公司

6AV6545-4BB16-0CX0觸摸屏

在自動控制電路中，起動按鈕SB2，停止按鈕SB1和交流接觸器KM組成了起動、保持、停止（簡稱起保停電路）典型控制電路。圖1-24是一個常用的簡單的控制電路。

起動時，合上隔離開關QS。引入三相電源，按下起動按鈕SB2，接觸器KM的線圈通電，接觸器的主觸頭閉合，電動機接通電源直接起動運轉。同時與SB2並聯的常開輔助觸頭KM也閉合，使接觸器線圈經兩條路通電，這樣，當SB2復位時，KM的線圈仍可通過KM觸頭繼續通電，從而保持電動機的連續運行。這種依靠按接觸器自身常開輔助觸頭而使其線圈保持通電的功能稱為自保或自鎖，這一對起自鎖作用的觸頭稱作自鎖觸頭。

要使電動機停止運轉，只要按下停止按鈕SB1，將控制電路斷開，接觸器KM斷電釋放，KM的常開主觸頭將三相電源切斷，電動機停止運轉。當按鈕SB1松開而恢復閉合時，接觸器線圈已不能再依靠自鎖觸頭通電了，因為原來閉合的觸頭早已隨著接觸器的斷電而斷開了。

起保停電路實現了電動機的連續運行控制。但有些生產機械要求按鈕按下時，電動機運轉，松開按鈕時，電動機就停止，這就是點動控制。如圖1-25圖a所示。圖b、c是實現點動與連續運行的電路。

下面用一個簡單的例子來進一步說明PLC的掃描工作過程。圖1-6給出了PLC的外部接線圖和梯形圖，起動按鈕SB1停止按鈕SB2和熱繼電器FR的常開觸點分別接在編號為X0~X2的PLC的輸入端，交流接觸器KM的線圈接在編號為Y0的PLC的輸出端。圖1-6b是這4個輸入／輸出變量對應的I／O映像寄存器，圖l-6c是PLC的梯形圖，它與圖1-3所示的繼電器電路的功能相同。但是應注意，梯形圖是一種軟件，是PLC圖形化的程序。圖中的X0等是梯形圖中的編程元件，X0~-X2是輸入繼電器，Y0是輸出繼電器。梯形圖中的編程元件X0與接在輸入端子X0的SBl的常開觸點和輸入映像寄存器X0相對應，編程元件Y0與輸出映像寄存器Y0和接在輸出端子Y0的PLC內部的輸出電路相對應。

梯形圖以指令的形式儲存在PLC的用戶程序存儲器中，圖l-6中的梯形圖與下面的5條指令相對應，“；”之後是該指令的注釋。

LD X0 ：接在左側母線上的X0的常開觸點

OR Y0 ；與X0的常開觸點並聯的Y0的常開觸點

ANI X1 ；與並聯電路串聯的X1的常閉觸點

ANI X2 ；串聯的X2的常閉觸點

OUT Y0 ；Y0的線圈

圖1-6中的梯形圖完成的邏輯運算為

Y0=(X0+Y0)·X1·X2

在輸入處理階段，CPU將SBl，SB2和FR的常開觸點的狀態讀入相應的輸入映像寄存器，外部觸點接通時存入寄存器的是二進制數l，反之存入0。

執行第l條指令時，從X0對應的輸入映像寄存器中取出二進制數並保存起來。執行第2條指令時，取出Y0對應的輸出映像寄存器中的二進制數，與X0對應的二進制數相“或”(電路的並聯對應“或”運算)。

執行第3條或第4條指令時，分別取出xl或X2對應的輸入映像寄存器中的二進制數，因為是常閉觸點，取反後與前面的運算結果相“與”(電路的串聯對應“與”運算)，然後存入運算結果寄存器。

執行第5條指令時，將運算結果寄存器中的二進制數送入Y0對應的輸出映像寄存器。在輸出處理階段，CPU將各輸出映像寄存器中的二進制數傳送給輸出模塊並鎖存起來，如果Y0對應的輸出映像寄存器存放的是二進制數1，外接的KM的線圈將通電，反之將斷電。

如果讀入輸入映像寄存器X0～X2的均為二進制數0，在程序執行階段，經過上述邏輯運算過程之後，運算結果仍為Y0=0，所以KM的線圈處於斷電狀態。按下起動按鈕SBl，X0變為l狀態，經邏輯運算後Y0變為1狀態，在輸出處理階段，將Y0對應的輸出映像寄存器中的1送到輸出模塊，PLC內Y0對應的物理繼電器的常開觸點接通，接觸器KM的線圈通電.

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漳州鼎晟達自動化設備有限公司

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