、模拟量的计算
1、-10—10V。-10V—10V的电压时,在6000分辨率时被转换为F448—0BB8he(-3000—3000);12000分辨率时被转换为E890—1770he(-6000—6000)。
2、 0—10V。0—10V的电压时,在12000分辨率时被转换为0—1770he(0—6000);12000分辨率时被转换为0—2EE0he(0—12000)。
3、 0—20mA。0—20mA的电流时,在6000分辨率时被转换为0—1770he(0—6000);12000分辨率时被转换为0—2EE0he(0—12000)。
4、 4—20mA。4—20mA的电流时,在6000分辨率时被转换为0—1770he(0—6000);12000分辨率时被转换为0—2EE0he(0—12000)。
以上仅做简单的介绍,不同的PLC有不同的分辨率,并且您所测量物理量实现的量程不一样。计算结果可能有一定的差异。
注:模拟输入的配线的要求:
1、使用屏蔽双绞线,但不连接屏蔽层。
2、当一个输入不使用的时候,将V IN 和COM端子短接。
3、模拟信号线与电源线隔离 (AC 电源线,高压线等)。
4、当电源线上有干扰时,在输入部分和电源单元之间安装一个虑波器。
5、确认正确的接线后,首先给CPU单元上电,然后再给负载上电。
6、断电时先切断负载的电源,然后再切断CPU的电源。
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