信号隔离器工作原理

首先将PLC接受的信号，通过半导体器件调制变换，然后通过光感或磁感器件进行隔离转换，然后再进行解调变换回隔离前原信号或不同信号，同时对隔离后信号的供电电源进行隔离处理。保证变换后的信号、电源、地之间绝对独立。

现在市场有那么多品牌的隔离器，价格参差不齐，该怎么选择呢？

    隔离器位于二个系统通道之间，所以选择隔离器首先要确定输入输出功能，同时要使隔离器输入输出模式（电压型、电流型、环路供电型等）适应前后端通道接口模式，此外尚有精度、功耗、噪音、绝缘强度、总线通讯等许多重要参数涉及产品性能，例如：噪音与精度有关、功耗能量与可靠性有关，这些需要使用者慎选。总之，试用、可靠、产品性价比是选择隔离器的主要原则。

   工作原理：首先将半导体器件调制变换，然后通过光感或磁感器进行隔离转换，然后再进行解调回隔离前原信号，同时对隔离后信号的供电电源进行隔离处理，保证变换后信号的供电电源进行隔离处理。保证变换后的信号、电源、地之间绝对独立。

一：保护下级的控制回路。

二：消弱环境噪声对测试电路的影响。

三：抑制公共接地、变频器、电磁阀PLC/DCS输入输出及通讯接口的忠实防护。

标准系列导轨结构，易于安装，可有效的隔离；输入、输出和电磁阀及大地之间的电位，能克服变频器噪声级各种高低频脉动干扰。 

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