新阶段 在这两个阶段中 即使输入状态和数据发生变化 I/O 映象区中的相应单元的状态和数据也不会改变 因此 如果输入是脉冲信号 则该脉冲信号的宽度必须大于一个扫描周期 才能保证在任何情况下 该输入均能被读入在用户程序执行阶段 PLC 总是按由上而下的顺序依次地扫描用户程序(梯形图)
ALLEN BRADLEY 135775 15-50 HP CAPACITOR, SEALED
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