6DD1640-0AB0

6DD1640-0AB0

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6DD1640-0AB0

O 引 言
隨著現(xiàn)

掃描控制基本流程如下：
1)程序首先計(jì)算各控制量的分段數(shù)目及段內(nèi)各控制量的起始值、步進(jìn)值、步進(jìn)個(gè)數(shù)。
2)通過系統(tǒng)總線，程序?qū)⑸鲜鲇?jì)算好的數(shù)據(jù)依次送入掃描控制器內(nèi)的RAM中保存。
3)程序控制觸發(fā)單元產(chǎn)生全局中斷信號(hào)，由中斷處理單元通知運(yùn)算單元讀取各控制量首段的初始值。
4)程序控制觸發(fā)單元產(chǎn)生使能信號(hào)，控制步進(jìn)脈沖發(fā)生單元產(chǎn)生計(jì)數(shù)脈沖。這時(shí)運(yùn)算單元開始進(jìn)行累加／減計(jì)算并且計(jì)數(shù)器記錄已產(chǎn)生的脈沖個(gè)數(shù)。累加／減運(yùn)算器的輸出值通過D／A變換器轉(zhuǎn)換為電壓值控制相關(guān)硬件電路。
5)當(dāng)運(yùn)算單元內(nèi)計(jì)數(shù)器的計(jì)數(shù)值達(dá)到本段設(shè)定的步進(jìn)個(gè)數(shù)時(shí)，運(yùn)算單元產(chǎn)生中斷信號(hào)通過中斷處理單元進(jìn)行中斷識(shí)別并通知運(yùn)算單元內(nèi)已產(chǎn)生中斷的模塊自動(dòng)從RAM內(nèi)讀取下一段的初始值。運(yùn)算單元內(nèi)四個(gè)模塊產(chǎn)生中斷的中斷級(jí)別各不相同，如果多個(gè)中斷同時(shí)產(chǎn)生，那么中斷處理單元會(huì)對(duì)各中斷進(jìn)行緩存、排序并且首先處理中斷級(jí)別高的中斷。
6)當(dāng)下一個(gè)計(jì)數(shù)脈沖到來(lái)時(shí)，運(yùn)算單元內(nèi)產(chǎn)生中斷的模塊又會(huì)重新開始累加／減運(yùn)算并計(jì)數(shù)，重復(fù)4、5步。
7)觸發(fā)單元記錄掃描時(shí)間。當(dāng)掃描時(shí)間達(dá)到預(yù)設(shè)值時(shí)，觸發(fā)單元控制使能信號(hào)為低電平，各寄存器復(fù)位，掃描過程結(jié)束。

3 模塊內(nèi)部實(shí)現(xiàn)
1)地址譯碼／數(shù)據(jù)緩存單元地址譯碼／數(shù)據(jù)緩存單元連接外部總線，通過譯碼接收屬于本掃描控制器的數(shù)據(jù)和控制字，包括：復(fù)位控制字、掃描使能控制字、觸發(fā)單元內(nèi)計(jì)數(shù)器的計(jì)數(shù)值(用于計(jì)算掃描時(shí)間)、步進(jìn)脈沖發(fā)生單元內(nèi)計(jì)數(shù)器的計(jì)數(shù)值(用于產(chǎn)生步進(jìn)脈沖)以及RAM內(nèi)需存儲(chǔ)的控制量DAC值。
2)RAM存儲(chǔ)單元
存儲(chǔ)控制量DAC值。如果接收機(jī)內(nèi)地址資源足夠豐富，軟件可以通過地址譯碼／數(shù)據(jù)緩存單元直接訪問RAM。如果接收機(jī)內(nèi)地址資源有限，可以將整個(gè)RAM劃分為若干個(gè)區(qū)域(段地址)，每個(gè)區(qū)域?qū)?yīng)于一種控制量。每種控制量的各分段數(shù)據(jù)依次排列，可通過段內(nèi)偏移地址訪問。
3)運(yùn)算單元
運(yùn)算單元包括RAM數(shù)據(jù)回讀模塊、計(jì)數(shù)器及累加／減運(yùn)算器模塊。RAM數(shù)據(jù)回讀模塊的回讀方式取決與RAM內(nèi)數(shù)據(jù)的存儲(chǔ)格式；計(jì)數(shù)器通過將讀取的步進(jìn)個(gè)數(shù)值與當(dāng)前的計(jì)數(shù)值進(jìn)行比較決定是否產(chǎn)生中斷。在實(shí)際應(yīng)用中，累加／減運(yùn)算器位數(shù)有限，而計(jì)算的步進(jìn)DAC值位數(shù)有可能大大超過運(yùn)算器位數(shù)，這就要求設(shè)計(jì)人員必須認(rèn)真選取步進(jìn)DAC的有效長(zhǎng)度，對(duì)DAC值進(jìn)行適當(dāng)截取，使控制誤差能夠在可接受的范圍內(nèi)。累加／減運(yùn)算器模塊在步進(jìn)脈沖的觸發(fā)下，對(duì)初始值進(jìn)行累加／減運(yùn)算，其DAC值輸出位數(shù)等于選甩的DAC器件位數(shù)。

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