AB产品22A-B8P0H204

22A-B8P0H204

22A-B8P0H204

信号线承担着检测信号和控制信号的传输任务，传输质量直接影响到整个控制系统的准确性、稳定性和可靠性.对信号线的干扰主要是来自空间的电磁辐射，有差模干扰和共模干扰两种.

差模干扰是指叠加在测量信号线上的干扰信号，这种干扰大多是频率较高的交变信号，其来源一般是藕合干扰.抑制常态干扰的方法有：

A、在输入回路接RC滤波器或双T滤波器，

B、尽量采用双积分式A/D转换器，由于这种积分器工作的特点，具有的高频干扰的作用：

C、将电压信号转换成电流信号再传输.

共模干扰是指信号线上共有的干扰信号，

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一般是由被测信号的接地端与控制系统的接地端存在的电位差引起的，这种干扰在两条信号线上的周期、幅值基本相等情况下，采用上面的方法无法或抑制.方法如下：

A、采用双差分输入的差动放大器，这种放大器具有很高的共模抑制比;

B、输入线采用绞合线，绞合线能降低共模干扰，其感应互相抵消，

C、采用光电隔离的方法，可以共模干扰;

D、使用屏蔽线，并单边接地;

为避免信号失真，对于较长距离传输的信号要注意阻抗匹配。

开关量信号(如按钮、限位开关、接近开关等提供的信号)一般对电缆无特殊要求，可选用一般的电缆，信号传输距离远时，可选用屏蔽电缆.

模拟信号和高速信号线(如脉冲传感器、计数码盘等提供的信号)应选择屏蔽电缆.

通讯电缆要求可靠性高，有的通信电缆的信号频率很高，一般应选择PLC 生产厂家提供的电缆，在要求不高或信号频率较低时，也可以选用带屏蔽的双绞线电缆，但品质要好.