聯(lián)系人:黃曉飛(銷售工程師) 移動電話:18030263579 固話: QQ:2472574325?
當(dāng)前,PLC的生產(chǎn)廠家相繼推出了一些智能式的I/O模塊。一般智能式I/O模塊本身帶有處理器,可對輸入或輸出信號作預(yù)先規(guī)定的處理,并將處理結(jié)果送入CPU或直接輸出,這樣可提高PLC的處理速度并節(jié)省存儲器的容量。
綜上,表3歸納了選擇I/O模塊的一般規(guī)則。
存儲器類型及容量選擇
PLC系統(tǒng)所用的存儲器基本上由PROM、EPROM及RAM三種類型組成,存儲容量則隨機器的大小變化,一般小型機的存儲能力低于6kB,中型機的存儲能力可達64kB,大型機的存儲能力可上兆字節(jié)。使用時可以根據(jù)程序及數(shù)據(jù)的存儲需要來選用合適的機型,必要時也可專門進行存儲器的擴充設(shè)計。
PLC的存儲器容量選擇和計算的種方法是:根據(jù)編程使用的節(jié)點數(shù)精確計算存儲器的實際使用容量。第二種為估算法,用戶可根據(jù)控制規(guī)模和應(yīng)用目的,按照表4的公式來估算。為了使用方便,一般應(yīng)留有25%~30%的裕量,獲取存儲容量的*佳方法是生成程序,即用了多少字。知道每條指令所用的字數(shù),用戶便可確定準確的存儲容量。表4同時給出了存儲器容量的估算方法。
編程器和外部設(shè)備的選擇c應(yīng)當(dāng)對所選擇PLC產(chǎn)品的軟件功能及編程器有所了解。通常情況下,小型控制系統(tǒng)一般選用價格便宜的簡易編程器,如果系統(tǒng)較大或多臺PLC共用,可以選用功能強、編程方便的圖形編程器。如果有個人計算機,可以選用能在個人計算機上運行的編程軟件包。同時,為了防止因干擾、鋰電池電壓下降等原因破壞RAM中的用戶程序,可以選用EEP-ROM模塊作為外部設(shè)備。
(一)利用三菱PLC實現(xiàn)對印刷機的精確控制
印刷機的一套電氣設(shè)計屬于系統(tǒng)設(shè)計,為了使產(chǎn)品性能穩(wěn)定,易于維護,采用以PLC為主控器的控制方案。印刷機要求易于操作,精度高,輸入、輸出點較多,因此采用雙機通訊。上位機采用三菱高性能的FX2N-80MR、FX2N-80MR自帶I/O接口,可以接40點輸入,40點輸出,主要負責(zé)主傳動的控制,各機組離合器的控制,以及氣泵,氣閥的控制等。下位機采用三菱FX2N-64MR、FX2N-64MR可以接32點輸入,32點輸出,主要負責(zé)水輥電機的控制,主傳動的調(diào)速輸出,調(diào)版電機數(shù)據(jù)采集等。上位機與下位機采用RS485, 通訊,通訊方便,可靠。同時選用了一臺三菱5.7寸觸摸屏,主要負責(zé)水輥電機速度顯示,調(diào)版顯示,以及整機故障顯示等。本系統(tǒng)運行可靠,維護方便,操作簡便直觀,大大提高了膠印機的檔次。
(二)歐姆龍(OMRON)PLC在石油加工工業(yè)中的應(yīng)用
在石油加工工業(yè)中,大型旋轉(zhuǎn)機組是裝置設(shè)備的重要組成部分,重油催化裂化氣壓機組的聯(lián)鎖-自保系統(tǒng)從滿足工藝生產(chǎn)需求出發(fā),考慮到安全性、可靠性、經(jīng)濟性、可擴展性等因素,采用了OMRON公司生產(chǎn)的CPM2AH型PLC進行系統(tǒng)構(gòu)建,CPM2AH自帶I/O接口,可以接36點輸入,24點輸出,輸出形式是繼電器,并且通過RS232C串口與PC
主要業(yè)務(wù):
ABB DCS卡件
Ovation系統(tǒng)模塊
Foxboro系統(tǒng)卡件
Triconex系統(tǒng)模塊
Rexroth力士樂全系列產(chǎn)品
Modicon停產(chǎn)模塊 等各類工控產(chǎn)品
Schneider(施耐德) 140系列PLC,CPU
Siemens 6DD,6FX,6SC,6FC,6S5系列
AB 1746,1756,1747,1785系列 PLC CP
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BALDOR ID15H202-W 2HP 230V AC DR
BALDOR ID15H203-E 3HP 230V AC DR
BALDOR ID15H203-W 3HP 230V AC DR
BALDOR ID15H205-E 5HP 230V AC DR
BALDOR ID15H205-W 5HP 230V AC DR
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BALDOR ID15H207-W 7.5H 230V AC DR
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NI-5752配件
NI-5752配件
NI-5752配件

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BALDOR ID15H401-W 1HP 460V AC DR
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BALDOR ID15H4150-EO 150H 460V AC DR
BALDOR ID15H4150V-EO 150H 460V AC DR
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