【TK212 ABB】

一產(chǎn)品,一價格,一質(zhì)量換您一份放心與舒心

我們承諾三高一低：

高品質(zhì)；高標(biāo)準(zhǔn)；高信譽(yù)；低價格

我們承諾三大保證：

質(zhì)量保證；原裝保證；價格保證

我們給與三：

優(yōu)資；原裝；低價

我們做足三*：

*原裝；*優(yōu)資；*低價！

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【TK212 ABB】 【】

優(yōu)先級是指多個中斷事件同時發(fā)出中斷請求時，CPU對中斷事件響應(yīng)的優(yōu)先次序。S7-200規(guī)定的中斷優(yōu)先由高到低依次是：通信中斷、I/O中斷和定時中斷。每類中斷中不同的中斷事件又有不同的優(yōu)先權(quán)，如表2所示。
一個程序中總共可有128個中斷。S7-200在各自的優(yōu)先級組內(nèi)按照先來先服務(wù)的原則為中斷提供服務(wù)。在任何時刻，只能執(zhí)行一個中斷程序。一旦一個中斷程序開始執(zhí)行，則一直執(zhí)行至完成。不能被另一個中斷程序打斷，即使是更高優(yōu)先級的中斷程序。中斷程序執(zhí)行中，新的中斷請求按優(yōu)先級排隊等候。中斷隊列能保存的中斷個數(shù)有限，若超出，則會產(chǎn)生溢出。中斷隊列的zui多中斷個數(shù)和溢出標(biāo)志位如表3所示。表2中斷事件及優(yōu)先級 

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