IC697CGR935

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 IC697CGR935 

 IC697CGR935 

 IC697CGR935 

PLC與電氣回路的接口，是通過輸入輸出部分（I/O）完成的。I/O模塊集成了PLC的I/O電路，其輸入暫存器反映輸入信號狀態(tài)，輸出點反映輸出鎖存器狀態(tài)。輸入模塊將電信號變換成數(shù)字信號進入PLC系統(tǒng)，輸出模塊相反。I/O分為開關(guān)量輸入（DI），開關(guān)量輸出（DO），模擬量輸入（AI），模擬量輸出（AO）等模塊。 

　　常用的I/O分類如下： 

　　開關(guān)量：按電壓水平分，有220VAC、110VAC、24VDC，按隔離方式分，有繼電器隔離和晶體管隔離。 

　　模擬量：按信號類型分，有電流型（4-20mA,0-20mA）、電壓型（0-10V,0-5V,-10-10V）等，按精度分，有12bit,14bit,16bit等。 

　　除了上述通用IO外，還有特殊IO模塊，如熱電阻、熱電偶、脈沖等模塊。 

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