如果接線端上的電壓值不正確，檢查輸入?yún)^(qū)域的設(shè)備，是否是設(shè)備或與之相連的線路有問題.如果輸入模板的輸入都不工作，那可能是外部的輸入電源有故障，沒有送電，或者沒有正確連接。(輸入和輸出設(shè)備通過-個外部電源提供電源，不由模板內(nèi)部供電)。輸入模板沒有保險，所以上面圖表中保險的LED指示燈不適用于輸入模板.輸出模板的L D指示當一個離散型輸出地址(%Q)在梯形圖語句中置位后，與之對應(yīng)的輸出LED指示燈點亮，表明該信號已傳遞到模板.

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