1771-NR/B
1771-NR/B
1771-NR/B
FX 系列 PLC 的移位指令常用的有循环移位指令和位移位指令。循环移位指令可以使数值或状态实现自动循环移位变换,使用简单,但是只能操作 16位或 32 位数据,使用受到限制。位移位指令使用灵活,可以对范围内的任意位数据移位。用移位指令设计的梯形图看起来简洁,指令也较少,但对较复杂控制系统设计就不方便,在工业控制中较少使用,大多数应用于彩灯顺序控制电路中。如图 3 所示的控制程序,利用位移位指令实现了 Y0—Y11 共 10 个输出继电器的顺序轮流接通。当 X0 接通时,Y0—Y11 正序轮流接通 1 秒;当 X0 断开时,Y0—Y11 反序轮流接通 1 秒,且能循环。如果输出接彩灯即可以实现彩灯的顺序自动控制。
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