從功能表圖可以看出，在0-3各步中只有一個(gè)步在某時(shí)刻接通而其他步都在斷開(kāi)，把各步用中間繼電器M200-M203代替，就很容易用移位寄存器實(shí)現(xiàn)控制。圖4為用移位寄存器編程時(shí)的梯形圖，采用移位寄存器M200-M217的前四位M200-M203代表4個(gè)步，組成1個(gè)環(huán)形移位寄存器。用移位寄存器主要是對(duì)數(shù)據(jù)、移位、復(fù)位3個(gè)輸入信號(hào)的處理。該方法設(shè)計(jì)的梯形圖看起來(lái)簡(jiǎn)潔，所用指令也較少，但對(duì)較復(fù)雜控制系統(tǒng)設(shè)計(jì)就不方便，使用過(guò)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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