描述
由于數(shù)據(jù)在寫入Flash后還有較長的編程時間，一頁的編程時間典型值為300μs，最大值為700μs。數(shù)據(jù)在存儲上不能有任何的停頓，否則就會丟失數(shù)據(jù)，所以不能使用R／B信號進行設(shè)計。為了系統(tǒng)更加可靠，選擇最大編程時間700μs。兩次對同一組Flash進行寫操作的時間間隔為700μs+81.92μs=781.92μs，一頁的數(shù)據(jù)寫到雙口RAM要
用25ns×2048=51.2μs。總時間除以寫一頁數(shù)據(jù)的時間：781.92／51.2=15.3μs，說明一個循環(huán)內(nèi)至少需要16組Flash才能滿足要求。所以在設(shè)計中，對于每路A／D采樣通道都用一片F(xiàn)PGA作為緩沖和控制系統(tǒng)，在每片F(xiàn)PGA內(nèi)部都采用4個緩沖區(qū)，每個緩沖區(qū)對應(yīng)一條外部總線，每條總線上掛有4組K9F2G08U0M×2(將兩片F(xiàn)lash并成16位操作，即把I／O并成16位，共用控制信號線)
歐美品牌停產(chǎn)的，常用的“PLC”備品備件
我司產(chǎn)品應(yīng)用于以下領(lǐng)域：
1,《發(fā)電廠DCS監(jiān)控系統(tǒng)》
2,《智能平鋼化爐系統(tǒng)制造》
3,《PLC可編程輸送控制系統(tǒng)》
4,《DCS集散控制系統(tǒng)》
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5,《智能型消防供水控制系統(tǒng)》
6,《化工廠藥液恒流量計算機控制系統(tǒng)》
7,《電氣控制系統(tǒng)》造紙,印染生產(chǎn)線,變電站綜合自動化控制系列
本特利，英維思，伍德沃德，福克斯波羅、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂，ACSO，力士樂等各大品牌的DCS系統(tǒng)配件，機器人系統(tǒng)配件，大型伺服系統(tǒng)備件。
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