IC697CHS790 IC697CHS790IC697CHS790 IC697CHS790IC697CHS790 IC697CHS790
由模塊聯結成系統有三種方法:
①無底板,靠模塊間接口直接相聯,然后再固定到相應導軌上。德維森公司的V80系列PLC就是這種結構,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,CV2000等中、大型機就是這種結構。它比較牢固,但底板的槽數是固定的,如3、5、8、10槽等等。槽數與實際的模塊數不一定相等,配置時難免有空槽。這既浪費,又多占空間,還得占空單元把多余的槽作*。
③用機架代替底板,所有模塊都固定在機架上。這種結構比底板式的復雜,但更牢靠。一些特大型的PLC用的多為這種結構。
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鄭娟萍
廈門仲鑫航自動化設備有限公司
按生產廠家分
目前生產PLC的廠家較多。但能配套生產,大、中、小、微型均能生產的不算太多。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系列的產品。有S5-95U、100U、115U、135U及155U。135U、155U為大型機,控制點數可達6000多點,模擬量可達300多路。zui近還推出S7系列機,有S7-200(小型)、S7-300(中型)及S7-400機(大型)。性能比S5大有提高。
日本OMRON公司:它有CPM1A型機,P型機,H型機,CQM1、CVM、CV型機,Ha型、F型機等,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,都占有相當的份額。
日本三菱公司的PLC也是較早推到我國來的。其小型機F1前期在國內用得很多,后又推出FX2機,性能有很大提高。它的中、大型機為A系列。AIS、AZC、A3A等。
日本日立公司也生產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點數分別為12/8、16/12、24/16及40/24。另外,還有擴展箱體,規格與主箱體相同其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PLC,其EX小型機及EX-PLUS小型機在國內也用得很多。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,點數較多,也是用梯形圖語言編程。
日本松下公司也生產PLC。FP1系列為小型機,結構也是箱體式的,尺寸緊湊。FP3為模塊式的,控制規模也較大,工作速度也很快,執行基本指令僅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。NS系列為模塊式。
美國GE公司、日本FANAC合資的GE-FANAC的90-70機也是很吸引人的。據介紹。它具有25個特點。諸如,用軟設定代硬設定,結構化編程,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90-30系列,其型號有344、331、323、321多種;還有90-20系列小型機,型號為211。
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