SIEMENS 6SE6440-2UD31-1CA1 变频器
1734-OB8的散热量高达28.8 V DC,每小时6.8 BTU。产品的隔离电压是在2500伏直流电下连续60秒钟测试的50伏绝缘电压。1734-OB8的外部直流电源为32mA,尺寸约为56.0 x 12.0 x 75.5毫米,接线类别为2个ON信号端口。
1734-OB8的工作原理:当可编程逻辑控制器投入运行后,其工作过程一般分为三个阶段,即输入采样、用户程序执行和输出刷新三个阶段。完成上述三个阶段称作一个扫描周期。在整个运行期间,可编程逻辑控制器的CPU以一定的扫描速度重复执行上述三个阶段。
1734-OB8在输入采样阶段,可编程逻辑控制器以扫描方式依次地读入所有输入状态和数据,并将它们存入I/O映象区中的相应的单元内。输入采样结束后,转入用户程序执行和输出刷新阶段。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
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