A20B-1002-0970FUANC伺服

從功能表圖可以看出，在0-3各步中只有一個步在某時刻接通而其他步都在斷開，把各步用中間繼電器M200-M203代替，就很容易用移位寄存器實現(xiàn)控制。圖4為用移位寄存器編程時的梯形圖，采用移位寄存器M200-M217的前四位M200-M203代表4個步，組成1個環(huán)形移位寄存器。用移位寄存器主要是對數(shù)據(jù)、移位、復(fù)位3個輸入信號的處理。該方法設(shè)計的梯形圖看起來簡潔，所用指令也較少，但對較復(fù)雜控制系統(tǒng)設(shè)計就不方便，使用過程中在線修改能力差，在工業(yè)控制中使用較少，大多數(shù)應(yīng)用在彩燈順序控制電路中。

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