網(wǎng)間的結(jié)點(diǎn)可直接或間接地通訊、溝通訊息。
    聯(lián)網(wǎng)、通訊，正習(xí)慣了當(dāng)今核算機(jī)集成制作體系（CIMS）及智能化工廠開展的需求。它可使工業(yè)操控從點(diǎn)（Point）、到線（（Line）再到面（Aero），使設(shè)備級的操控、出產(chǎn)線的操控、工廠管理層的操控連成一個全體，進(jìn)而可發(fā)明更高的效益。這個無限夸姣的遠(yuǎn)景，已越來越清楚地展如今我們這一代人的面前。 
    以上幾點(diǎn)運(yùn)用是側(cè)重從質(zhì)上講的。從量上講，PLC有大、有小。所以，它的操控規(guī)劃也可大、可小。小的只操控一個設(shè)備，乃至一個部件，一個站點(diǎn)；大的可操控多臺設(shè)備，一條出產(chǎn)線，以致于全部工廠。能夠說，工業(yè)操控的巨細(xì)場合，都離不開PLC。
    通常講，工業(yè)出產(chǎn)進(jìn)程可分為兩品種型；接連型出產(chǎn)進(jìn)程（如化學(xué)工業(yè)）及非接連型，即離散型出產(chǎn)進(jìn)程（如機(jī)械制作業(yè)）。前者出產(chǎn)目標(biāo)是接連的，分不出件的；后者為離散的，一件件的。因為PLC有上述幾個方面的運(yùn)用，并且，操控的規(guī)劃又可大、可小，所以，這兩品種型的出產(chǎn)進(jìn)程都有其用武之地。

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