1771-IXE
1771-IXE
1771-IXE
1.步進(jìn)階梯設(shè)計(jì)設(shè)計(jì)依據(jù)如圖6所示。圖7a為按圖6所示要求采用移位指令設(shè)計(jì)法設(shè)計(jì)的順序控制系統(tǒng)步進(jìn)階梯,這種步進(jìn)階梯由一個(gè)8位移位寄存器(由移位指令定義輔助繼電器M20~M27而成)作為控制元件。該移位寄存器中的IN為移位數(shù)據(jù)輸入端,CP為移位脈沖輸入端,R為復(fù)位端。這三個(gè)輸入端的輸入信號(hào)均為脈沖上升沿有效。對(duì)順序控制系統(tǒng)來說,輸入IN的信號(hào)必須是一個(gè)單脈沖信號(hào),即移位數(shù)據(jù)為“1”。起動(dòng)步1時(shí),IN和CP同時(shí)輸入按鈕信號(hào)X0的脈沖上升沿后,在IN端生成的移位數(shù)據(jù)“1”便移入移位寄存器的M20位,此時(shí)該位有輸出(即輸出M20的常開觸點(diǎn)閉合信號(hào)),建立步1程序,并為步2提供步進(jìn)條件信號(hào);M20的常閉觸點(diǎn)即時(shí)斷開IN輸入端和CP的步1輸入端,完成數(shù)據(jù)“1”輸入和移位脈沖輸入。從步2起,本步的轉(zhuǎn)步主令信號(hào)一發(fā)出(X2接通),便輸入一個(gè)移位脈沖上升沿,使原來移入M20位的數(shù)據(jù)“1”移入M21位,建立步2程序,并為步3提供步進(jìn)條件信號(hào)。移位后,M20位的狀態(tài)變?yōu)?/span>0,即其相應(yīng)的步1被撤銷,輸出為0。依此類推便可實(shí)現(xiàn)整個(gè)步進(jìn)階梯逐步得電和逐步失電。最后一步完成并回到原位(X1接通)時(shí),接通移位寄存器的復(fù)位端R,使移位寄存器復(fù)位清零,整個(gè)控制系統(tǒng)失電停止。
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