A20B-1002-0970FUANC伺服

从功能表图可以看出，在0-3各步中只有一个步在某时刻接通而其他步都在断开，把各步用中间继电器M200-M203代替，就很容易用移位寄存器实现控制。图4为用移位寄存器编程时的梯形图，采用移位寄存器M200-M217的前四位M200-M203代表4个步，组成1个环形移位寄存器。用移位寄存器主要是对数据、移位、复位3个输入信号的处理。该方法设计的梯形图看起来简洁，所用指令也较少，但对较复杂控制系统设计就不方便，使用过程中在线修改能力差，在工业控制中使用较少，大多数应用在彩灯顺序控制电路中。

武汉路易达自动化设备有限公司
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