I/O模塊
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字信號進入PLC系統(tǒng),輸出模塊相反。I/O分為開關量輸入(DI),開關量輸出(DO),模擬量輸入(AI),模擬量輸出(AO)等模塊。
公司 名稱:廈門泰尼電氣有限公司
固定 電話:0592-6809819
聯(lián) 系 人:張亮
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公司地址:廈門市海滄區(qū)海滄街道濱湖一里7號2008室
開關量是指只有開和關(或1和0)兩種狀態(tài)的信號,模擬量是指連續(xù)變化的量。常用的I/O分類如下:
開關量: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。
按I/O點數確定模塊規(guī)格及數量,I/O模塊可多可少,但其最大數受CPU所能管理的基本配置的能力,即受最大的底板或機架槽數限制。
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