AB 1761-NET-ENI
? PLC系統(tǒng)所用的存儲(chǔ)器基本上由PROM、EPROM及RAM三種類型組成,存儲(chǔ)容量則隨機(jī)器的大小變化,一般小型機(jī)的大存儲(chǔ)能力低于6kB,中型機(jī)的大存儲(chǔ)能力可達(dá)64kB,大型機(jī)的大存儲(chǔ)能力可上兆字節(jié)。使用時(shí)可以根據(jù)程序及數(shù)據(jù)的存儲(chǔ)需要來選用合適的機(jī)型,必要時(shí)也可專門進(jìn)行存儲(chǔ)器的擴(kuò)充設(shè)計(jì)。
???? PLC的存儲(chǔ)器容量選擇和計(jì)算的種方法是:根據(jù)編程使用的節(jié)點(diǎn)數(shù)精確計(jì)算存儲(chǔ)器的實(shí)際使用容量。第二種為估算法,用戶可根據(jù)控制規(guī)模和應(yīng)用目的,按照表4的公式來估算。為了使用方便,一般應(yīng)留有25%~30%的裕量,獲取存儲(chǔ)容量的 佳方法是生成程序,即用了多少字。知道每條指令所用的字?jǐn)?shù),用戶便可確定準(zhǔn)確的存儲(chǔ)容量。表4同時(shí)給出了存儲(chǔ)器容量的估算方法。
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