1794-IRT8

1794-IRT8

1794-IRT8

1794-IRT8

PLC的输入模块是用来检测接收现场输入设备的信号，并将输入的信号转换为PLC内部接受的低电压信号。

1．输入信号的类型及电压等级的选择 常用的开关量输入模块的信号类型有三种：直流输入、交流输入和交流／直流输入。选择时一般根据现场输入信号及周围环境来决定。

交流输入模块接触可靠，适合于有油雾、粉尘的恶劣环境下使用；直流输入模块的延迟时间较短，还可以直接与接近开关、光电开关等电子输入设备连接。

PLC的开关量输入模块按输入信号的电压大小分类有：直流5V、24V、48V、60V等；交流110V、220V等。选择时应根据现场输入设备与输入模块之间的距离来决定。一般5V、12V、24V用于传输距离较近场合。如：5V的输入模块***远不得超过10m距离，较远的应选用电压等级较高的模块。

2．输入接线方式选择   接输入电路接线方式的不同，开关量输入模块可分为汇点式输入和分组式输入两种，

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