1771-ASB價(jià)格杠杠的1771-ASB價(jià)格杠杠的

PLC可編程控制器的分類
    1）按I/O點(diǎn)數(shù)分類
    PLC所能接受的輸入信號個(gè)數(shù)和輸出信號個(gè)數(shù)分別稱為PLC的輸入點(diǎn)數(shù)和 輸出點(diǎn)數(shù)。其輸入、輸出點(diǎn)數(shù)的數(shù)目之和稱為PLC的輸入/輸出點(diǎn)數(shù)，簡稱I/O點(diǎn)數(shù)。I/O點(diǎn)數(shù)是選擇PLC的重要依據(jù)之一。
    一般而言，PLC控制系統(tǒng)處理的I/O點(diǎn)數(shù)較多時(shí)，則控制關(guān)系比較復(fù)雜，用戶要求的程序存儲器容量也較大，要求PLC指令及其他功能比較多。按PLC輸入、輸出點(diǎn)數(shù)的多少可將PLC分為以下三類。
    （1）小型機(jī)
    小型PLC輸入、輸出總點(diǎn)數(shù)一般在256點(diǎn)以下，用戶程序存儲器容量在4K字左右。小型PLC的功能一般以開關(guān)量控制為主，適合單機(jī)控制和小型控制系統(tǒng)。
    （2）中型機(jī)
    中型PLC的輸入、輸出總點(diǎn)數(shù)在256~2048點(diǎn)之間，用戶程序存儲器容量達(dá)到8K字左右。中型機(jī)適用于組成多機(jī)系統(tǒng)和大型控制系統(tǒng)。

鄭娟萍

廈門仲鑫航自動化設(shè)備有限公司

(3) 大型機(jī)
    大型PLC的輸入、輸出總點(diǎn)數(shù)載2084點(diǎn)以上，用戶程序存儲器容量達(dá)到16K字以上。大型機(jī)適用于組成分布式控制系統(tǒng)和整個(gè)工廠的集散控制網(wǎng)絡(luò)。
    上述劃分沒有一個(gè)十分嚴(yán)格的界限，隨著PLC技術(shù)的飛速發(fā)展，一些小型PLC也具備中型或大型PLC的功能，這也是PLC的發(fā)展趨勢。
    2）按結(jié)構(gòu)形式分類
    按照PLC的結(jié)構(gòu)特點(diǎn)可分為整體式、模塊式兩大類。
    （1）整體式結(jié)構(gòu)
    把PLC的CPU、存儲器、輸入/輸出單元、電源等集成在一個(gè)基本單元中，其結(jié)構(gòu)經(jīng)湊，體積小，成本低，安裝方便。基本單元上設(shè)有擴(kuò)展端口，通過電纜與擴(kuò)展單元相連，可配接特殊功能模塊。微型和小型PLC一般為整體式結(jié)構(gòu)，S7-200系列屬整體式結(jié)構(gòu)。
    （2）模塊式結(jié)構(gòu)
    模塊式結(jié)構(gòu)的PLC由一些模塊單元構(gòu)成，這些標(biāo)準(zhǔn)模塊包括CPU模塊、輸入模塊、輸出模塊、電源模塊和各種特殊功能模塊等，使用時(shí)將這些模塊插在標(biāo)準(zhǔn)機(jī)架內(nèi)即可。各模塊功能是獨(dú)立的，外形尺寸是統(tǒng)一的。模塊式PLC的硬件組態(tài)方便靈活，裝配和維修方便，易于擴(kuò)展。
    目前，中、大型PLC多采用模塊式結(jié)構(gòu)形式，如西門子的S7-300和S7-400系列。

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