2711-B5A2L1【】2711-B5A2L1

2711-B5A2L1

plc的輸入信號(hào)多為開(kāi)關(guān)量信號(hào)，分直流和交流開(kāi)關(guān)量輸入信號(hào)兩種，各種開(kāi)關(guān)量輸入接口的基本結(jié)構(gòu)大同小異。圖7.2所示電路是一種直流開(kāi)關(guān)量的輸入接口電路。

　　圖中所示為8點(diǎn)輸入接口電路，0～7為8個(gè)輸入接線(xiàn)端子，COM為輸入公共端，24V直流電源為PLC內(nèi)部專(zhuān)供輸入接口用的電源，K0～K7為現(xiàn)場(chǎng)外接的開(kāi)關(guān)。內(nèi)部電路中R1為限流電阻，R2和C構(gòu)成濾波電路，可濾掉輸入信號(hào)的高頻抖動(dòng)，保證光電隔離器工作的可靠性。發(fā)光二級(jí)管LED0為輸入狀態(tài)指標(biāo)燈。例如：當(dāng)輸入開(kāi)關(guān)K0閉合時(shí)，經(jīng)R1、二極管LED0和VT0構(gòu)成通路，輸入指示燈LED0亮，同時(shí)光電耦合器VT0飽和導(dǎo)通，X0輸出高電平。K0打開(kāi)時(shí)，電路不通，LED0不亮，VT0不導(dǎo)通，X0＝0，無(wú)信號(hào)輸入到CPU。

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