智能總線控制器的切換智能總線控制:器當(dāng)在一-定的時(shí)間沒有接收到PLC傳送的輸出數(shù)據(jù)后會(huì)停止對(duì)智能設(shè)備的輸出，這段時(shí)間等于兩倍的看門狗計(jì)時(shí)器的設(shè)置值。如果首要單元中的CPU在非控制(例如掉電)的情況下無法執(zhí)行控制

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