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用戶程序所需的存儲容量大小不僅與PLC系統(tǒng)的功能有關，而且還與功能實現(xiàn)的方法、程序編寫水平有關。一個有經(jīng)驗的程序員和一個初學者，在完成同一復雜功能時，其程序量可能相差25％之多，所以對于初學者應該在存儲容量估算時多留裕量。
PLC的I／O點數(shù)的多少，在很大程序上反映了PLC系統(tǒng)的功能要求，因此可在I／O點數(shù)確定的基礎上，按下式估算存儲容量后，再加20％~30％的裕量。
存儲容量（字節(jié)）＝開關量I／O點數(shù)×10 ＋ 模擬量I／O通道數(shù)×100
另外，在存儲容量選擇的同時，注意對存儲器的類型的選擇。
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