ROSEMOUNT 396R-10-21-54

ROSEMOUNT 396R-10-21-54

ROSEMOUNT 396R-10-21-54

2I/O點(diǎn)數(shù)的確定。 統(tǒng)計(jì)被控制系統(tǒng)的開(kāi)關(guān)量、模擬量的I/O點(diǎn)數(shù)，并考慮以后的擴(kuò)充（一般加上10%～20%的備用量），從而選擇PLC的I/O點(diǎn)數(shù)和輸出規(guī)格。

3內(nèi)存的估算。 用戶(hù)程序所需的內(nèi)存容量主要與系統(tǒng)的I/O點(diǎn)數(shù)、控制要求、程序結(jié)構(gòu)長(zhǎng)短等因素有關(guān)。一般可按下式估算：存儲(chǔ)容量=開(kāi)關(guān)量輸入點(diǎn)數(shù)×10+開(kāi)關(guān)量輸出點(diǎn)數(shù)×8+模擬通道數(shù)×100+定時(shí)器/計(jì)數(shù)器數(shù)量×2+通信接口個(gè)數(shù)×300+備用量。

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