PCM與PLC的通訊(331型及更高級(jí))對(duì)諸如PCM的智能任選模塊需要服務(wù)時(shí),是無(wú)法中斷CPU的。CPU必須針對(duì)服務(wù)請(qǐng)求輪詢(pl)各個(gè)智能任選模塊,這可在掃描的任何時(shí)刻進(jìn)行(見圖2-4所示流程圖)。當(dāng)智能任選模塊已被登記并向CPU發(fā)出一個(gè)服務(wù)請(qǐng)求,這-請(qǐng)求要在系統(tǒng)通訊窗口處理中排隊(duì)等待處理。

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