SIEMENS 565-2820

SIEMENS 565-2820

1.可能模拟量输入模块和现场传感器分别使用了自供电或隔离的电源，而两个电源没有彼此连接，即模拟量输入模块的电源和现场传感器的信号地没有连接；这将会产生一个很高的上下振动的共模电压，影响模拟量输入值。

2.另一个原因可能是模拟量输入模块接线太长或绝缘不好受到电磁干扰。

可以用如下方法解决：

1.连接现场传感器的负端与模块上的公共M端以补偿此波动，如图1所示：（但要注意，确保这是两个电源系统之间的联系。）

背景是：

模拟量输入模块内部是非隔离的；

共模电压小于12V且大于-12V；

对于60Hz干扰信号的共模抑制比为40dB；

SIEMENS 565-2820 

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