EPRO PR9376/010-021 傳感器

EPRO PR9376/010-021 傳感器

PLC接收外部輸入的開關(guān)量信號(hào)的窗口。PLC通過光耦合器，將外部信號(hào)的狀態(tài)讀入并存儲(chǔ)在輸入映像寄存器中。輸入端可以外接常開觸點(diǎn)或常閉觸點(diǎn)，也可以接多個(gè)觸點(diǎn)組成的串并聯(lián)電路或電子傳感器(如接近開關(guān))。在梯形圖中，可以多次使用輸入繼電器的常開觸點(diǎn)和常閉觸點(diǎn)。  X0端子外接的輸入電路接通時(shí)，它對(duì)應(yīng)的輸入映像寄存器為1狀態(tài)，斷開時(shí)為0狀態(tài)。輸入繼電器的狀態(tài)惟一地取決于外部輸入信號(hào)的狀態(tài)，不可能受用戶程序的控制，因此在梯形圖中不能出現(xiàn)輸入繼電器的線圈。因?yàn)?/span>PLC只是在每一掃描周期開始時(shí)讀取輸入信號(hào)，輸入信號(hào)為ON或OFF的持續(xù)時(shí)間應(yīng)大于PLC的掃描周期。如果不滿足這一條件，可能會(huì)丟失輸入信號(hào)。

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