2711-K5A8L1【】2711-K5A8L1
2711-K5A8L11.I/O點(diǎn)數(shù)的估算
在選機(jī)型時(shí),應(yīng)保證I/O點(diǎn)數(shù)有15~20%的余量。
2.內(nèi)存容量的估算
用戶程序所占內(nèi)存容量受I/O點(diǎn)數(shù)、用戶程序編制水平等因素的影響,程序越短,程序執(zhí)行的掃描周期就越短。
估算內(nèi)存大小可根據(jù)下列方法來(lái)確定:
1)開(kāi)關(guān)量I/O點(diǎn)數(shù):
一般plc的開(kāi)關(guān)量I/O點(diǎn)數(shù)的比值為3/2(CPM1A)或1/1(FX2N),因此根據(jù)I/O總點(diǎn)數(shù)所需的內(nèi)存容量為:
所需內(nèi)存步數(shù) = I/O開(kāi)關(guān)量總點(diǎn)數(shù)×(10~15)~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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2)模擬量I/O總點(diǎn)數(shù)
具有模擬量控制要求的系統(tǒng)要用到數(shù)據(jù)傳送和運(yùn)算等功能指令,所占內(nèi)存較多,其內(nèi)存容量可按下式計(jì)算:
所需內(nèi)存步數(shù) = 模擬量I/O總點(diǎn)數(shù)×(200~250)
3)程序編寫(xiě)的質(zhì)量
設(shè)計(jì)人員的編程水平直接影響到程序的長(zhǎng)短及運(yùn)行時(shí)間。
綜上所述,估算PLC所需內(nèi)存的總?cè)萘繛椋?/span>
開(kāi)關(guān)量I/O總點(diǎn)數(shù)×(10~15)+模擬量I/O總點(diǎn)數(shù)×(200~250)+30%的余量
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