140CPS41400
140CPS41400
140CPS41400
本地I/O
可編程序控制器的本地I/O框架一般距CPU框架很近,它們往往裝在同一個(gè)控制柜內(nèi)。對(duì)于單臺(tái)機(jī)械設(shè)備,如中小型機(jī)床,一般只有本地I/O。本地I/O用多芯電纜(一般是扁平電纜)實(shí)現(xiàn)擴(kuò)展I/O框架與CPU框架之間的通信。扁平電纜可能多達(dá)數(shù)十根導(dǎo)線,信息是并行傳送的,這種通信方式實(shí)際上是總線通信的擴(kuò)展,其主要優(yōu)點(diǎn)是數(shù)據(jù)傳輸速度快,在某些情況下可以同步地刷新CPU模塊中的I/O映象表。“本地“(Local)這一名詞不是很確切的,因?yàn)橛袝r(shí)本地I/O與CPU模塊的距離可能長(zhǎng)達(dá)數(shù)百m。本地I/O模塊的主要特征是框架之間采用并行通信方式,通常用編程器可以直接對(duì)本地I/O存取數(shù)據(jù),對(duì)系統(tǒng)調(diào)試和查錯(cuò)特別方便。但是多芯電纜價(jià)格很貴,對(duì)于改造舊設(shè)備,電纜的安裝(如穿管)可能不是很方便。
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