DG4V-3-2A-M-W-B-40
DG4V-3-2A-M-W-B-40
DG4V-3-2A-M-W-B-40
I/O端的接線
1. 輸入接線
(1)輸入接線般不要超過(guò)30米。但如果環(huán)境干擾較小,電壓降不大時(shí),輸入接線可適當(dāng)長(zhǎng)些。
(2)輸入/輸出線不能用同根電纜,輸入/輸出線要分開(kāi)。
(3)盡可能采用常開(kāi)觸點(diǎn)形式連接到輸入端,使編制的梯形圖與繼電器原理圖,便于閱讀。
2. 輸出連接
(1)輸出端接線分為獨(dú)立輸出和公共輸出。在不同組中,可采用不同類(lèi)型和電壓等級(jí)的輸出電壓。但在同組中的輸出只能用同類(lèi)型、同電壓等級(jí)的電源。
(2)由于PLC的輸出元件被封裝在印制電路板上,并且連接至端子板,若將連接輸出元件的負(fù)載短路,將燒毀印制電路板,因此,應(yīng)用熔絲保護(hù)輸出元件。
(3)采用繼電器輸出時(shí),所承受的電感性負(fù)載的大小,會(huì)影響到繼電器的使用壽命,因此,使用電感性負(fù)載時(shí)選擇繼電器作壽命要長(zhǎng)。
(4)PLC的輸出負(fù)載可能產(chǎn)生干擾,因此要采取措施加以控制,如直流輸出的續(xù)流管保護(hù),交流輸出的阻容吸收電路,晶體管及雙向晶閘管輸出的旁路電阻保護(hù)。
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