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CPU停止模式
CPU在停止模式時(shí)有兩種操作模式:
■/O掃描使能-每個(gè)周期都進(jìn)行輸入輸出掃描
■I/O掃描失效-跳過輸入輸出掃描
CPU在停止模式時(shí)不執(zhí)行應(yīng)用程序。用戶可以自行配置是否在停止模式進(jìn)行/O掃描。停止模式下，仍然與編程器和智能模塊通訊。停止模式下，仍然校驗(yàn)總線接收模塊和進(jìn)行機(jī)架重配置。
在這兩種停止模式中，控制器通訊和背板通訊窗口以運(yùn)行-停止模式運(yùn)行，后臺(tái)窗口以受限模式運(yùn)行，限定值為10毫秒。
后的掃描數(shù)可以在硬件配置中設(shè)定。在收到運(yùn)行到停止的轉(zhuǎn)換信號(hào)或者故障停止時(shí)，要完成一定次數(shù)的掃描才轉(zhuǎn)換到停止?fàn)顟B(tài)。缺省值為0。服務(wù)請(qǐng)求13(SVCREQ13)用于設(shè)定完成多少次掃描后CPU轉(zhuǎn)換為停止?fàn)顟B(tài)。所有的I/O轉(zhuǎn)換到配置的缺省狀態(tài)，CPU故障表會(huì)記錄--條自診斷信息。
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