A16B-1211-0850

A16B-1211-0850

通常講，依據(jù)實踐的I/O點數(shù)，凡落在上述不一樣規(guī)劃者，選用相應(yīng)的機型，功用報價比必定要高；相反，肯定要差些。
自然，也有特別狀況。如操控點數(shù)不是十分之多，不是非用大型機不行，但因大型機的特別操控單元多，可進行熱備裝備，因此選用了大型機。
4.2按構(gòu)造區(qū)分
PLC可分為箱體式及模塊式兩大類。微型機、小型機多為箱體式的，但從開展趨勢看，小型機也逐漸開展成模塊式的了。如OMRON公司，本來小型機都是箱體式，如今的CQM1則為模塊式的。
箱體的PLC把電源、CPU、內(nèi)存、I/O體系都集成在一個小箱體內(nèi)。一個主機箱體即是一臺完好的PLC，就可用以完結(jié)操控。操控點數(shù)不符需求，可再接拓展箱體，由主箱體及若干拓展箱體構(gòu)成較大的體系，以完結(jié)對較多點數(shù)的操控。
模塊式的PLC是按功用分紅若干模塊，如CPU模塊、輸入模塊、輸出模塊、電源模塊等等。大型機的模塊功用更單一一些，因此模塊的品種也相對多些。這也可說是趨勢。如今一些中型機，其模塊的功用也趨于單一，品種也在增鄉(xiāng)。如一樣OMRON公司C20系列PLC，H機的CPU單元就富含電源，而Ha機則把電源分出，有獨自的電源模塊。
模塊功用更單一、品種更多，可便于體系裝備，使PLC更能物盡其用，到達更高的運用效益。
由模塊聯(lián)結(jié)成體系有三種辦法：
①無底板，靠模塊間接口直接相聯(lián)，然后再固定到相應(yīng)導軌上。德維森公司的V80系列PLC即是這種構(gòu)造，對比緊湊。
②有底板，一切模塊都固定在底板上。如德維森公司的PPC11、PPC22和PPC31系列PLC，OMRON公司的C200Ha機，CV2000等中、大型機即是這種構(gòu)造。它對比結(jié)實，但底板的槽數(shù)是固定的，如3、5、8、10槽等等。槽數(shù)與實踐的模塊數(shù)不必定持平，裝備時不免有空槽。這既糟蹋，又多占空間，還得占空單元把剩余的槽作添補。

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