IC697MDL350 IC697MDL350IC697MDL350 IC697MDL350
由模塊聯(lián)結(jié)成系統(tǒng)有三種方法：
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(dǎo)軌上。德維森公司的V80系列PLC就是這種結(jié)構(gòu)，比較緊湊。
②有底板，所有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(jī)，CV2000等中、大型機(jī)就是這種結(jié)構(gòu)。它比較牢固，但底板的槽數(shù)是固定的，如3、5、8、10槽等等。槽數(shù)與實(shí)際的模塊數(shù)不一定相等，配置時難免有空槽。這既浪費(fèi)，又多占空間，還得占空單元把多余的槽作*。
③用機(jī)架代替底板，所有模塊都固定在機(jī)架上。這種結(jié)構(gòu)比底板式的復(fù)雜，但更牢靠。一些特大型的PLC用的多為這種結(jié)構(gòu)。
鄭娟萍
廈門仲鑫航自動化設(shè)備有限公司
按生產(chǎn)廠家分
目前生產(chǎn)PLC的廠家較多。但能配套生產(chǎn)，大、中、小、微型均能生產(chǎn)的不算太多。較有影響的，在中國市場占有較大份額的公司有：
德國西門子公司：它有S5系列的產(chǎn)品。有S5－95U、100U、115U、135U及155U。135U、155U為大型機(jī)，控制點(diǎn)數(shù)可達(dá)6000多點(diǎn)，模擬量可達(dá)300多路。zui近還推出S7系列機(jī)，有S7-200（小型）、S7-300（中型）及S7-400機(jī)（大型）。性能比S5大有提高。
日本OMRON公司：它有CPM1A型機(jī)，P型機(jī)，H型機(jī)，CQM1、CVM、CV型機(jī)，Ha型、F型機(jī)等，大、中、小、微均有，特別在中、小、微方面更具特長，在中國及世界市場，都占有相當(dāng)?shù)姆蓊~。
日本三菱公司的PLC也是較早推到我國來的。其小型機(jī)F1前期在國內(nèi)用得很多，后又推出FX2機(jī)，性能有很大提高。它的中、大型機(jī)為A系列。AIS、AZC、A3A等。
日本日立公司也生產(chǎn)PLC，其E系列為箱體式的。基本箱體有E-20、E-28、E－40、E－64。其I/O點(diǎn)數(shù)分別為12/8、16/12、24/16及40/24。另外，還有擴(kuò)展箱體，規(guī)格與主箱體相同其EM系列為模塊式的，可在16～160之間組合。
日本東芝公司也生產(chǎn)PLC，其EX小型機(jī)及EX－PLUS小型機(jī)在國內(nèi)也用得很多。它的編程語言是梯形圖，其的編程器用梯形圖語言編程。另外，還有EX100系列模塊式PLC，點(diǎn)數(shù)較多，也是用梯形圖語言編程。
日本松下公司也生產(chǎn)PLC。FP1系列為小型機(jī)，結(jié)構(gòu)也是箱體式的，尺寸緊湊。FP3為模塊式的，控制規(guī)模也較大，工作速度也很快，執(zhí)行基本指令僅0?l微秒。
日本富士公司也有PLC。其NB系列為箱體式的，小型機(jī)。NS系列為模塊式。
美國GE公司、日本FANAC合資的GE－FANAC的90－70機(jī)也是很吸引人的。據(jù)介紹。它具有25個特點(diǎn)。諸如，用軟設(shè)定代硬設(shè)定，結(jié)構(gòu)化編程，多種編程語言，等等。它有914、781／782、771／772、731／732等多種型號。另外，還有中型機(jī)90－30系列，其型號有344、331、323、321多種；還有90－20系列小型機(jī)，型號為211。
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