1762-OB16
PLC，是在繼電器和計(jì)算機(jī)的基礎(chǔ)上發(fā)展而來的，并逐步發(fā)展成為以微處理器為核心，把自動(dòng)化技術(shù)、計(jì)算機(jī)技術(shù)、通信技術(shù)融為一體的新型工業(yè)自動(dòng)控制裝置。可編程序控制器以其可靠性極高(可編程控制器的平均無故障時(shí)間可達(dá)幾十萬小時(shí)，約30年)、能經(jīng)受惡劣環(huán)境的考驗(yàn)、使用方便等巨大優(yōu)越性，迅速占領(lǐng)了工業(yè)自動(dòng)控制領(lǐng)域，成為工業(yè)自動(dòng)控制的首選產(chǎn)品。為了適應(yīng)PLC技術(shù)日益廣泛的應(yīng)用趨勢，近年來，許多職業(yè)技術(shù)學(xué)校開設(shè)了PLC這門具有很強(qiáng)實(shí)踐性、創(chuàng)造性及時(shí)代發(fā)展性的課程。在PLC課程教學(xué)中，為使學(xué)生由被動(dòng)聽課變?yōu)橹鲃?dòng)探求、自主學(xué)習(xí)，達(dá)到掌握知識(shí)的目的;為使學(xué)生所設(shè)計(jì)的程序更加合理，與實(shí)際應(yīng)用更加接近，在PLC控制系統(tǒng)設(shè)計(jì)時(shí)應(yīng)注意以下幾點(diǎn)。
可編程序控制器(PLC)及編程器的選擇
雖然大部分學(xué)校所用的PLC只有一兩種，但目前市場上的PLC產(chǎn)品眾多，除國產(chǎn)品牌以外，國外的品牌有：日本OMRON、MITSUBISHI、FUJI、IDEC、HITACHI、松下，德國的西門子，韓國的LG等，我們除了要讓學(xué)生熟練掌握學(xué)?，F(xiàn)有PLC的應(yīng)用外，還要讓學(xué)生了解其他產(chǎn)品PLC的特點(diǎn)和應(yīng)用。那么如何選擇PLC產(chǎn)品呢?
1.系統(tǒng)首先應(yīng)按控制要求計(jì)算輸入、輸出(I/O)點(diǎn)數(shù)，并且在選用PLC時(shí)要在實(shí)際需要點(diǎn)數(shù)的基礎(chǔ)上預(yù)留10%的余量，以備系統(tǒng)的擴(kuò)展或改造。
2.確定負(fù)載類型根據(jù)PLC輸出端所帶負(fù)載是直流型還是交流型，是大電流還是小電流，以及PLC輸出點(diǎn)動(dòng)作的頻率等，從而確定輸出端采用繼電器輸出還是晶體管輸出，或是晶閘管輸出。不同的負(fù)載選用不同的輸出方式對(duì)系統(tǒng)的穩(wěn)定運(yùn)行是很重要的。
3.存儲(chǔ)容量與指令的執(zhí)行速度是PLC選型的重要指標(biāo)，一般存儲(chǔ)量越大、速度越快的PLC價(jià)格就越高，盡管國外各廠家產(chǎn)品大體相同，但也有一定區(qū)別。
4.“COM”點(diǎn)的選擇，不同的PLC產(chǎn)品，其“COM”點(diǎn)的數(shù)量是不一樣的，有的一個(gè)“COM”點(diǎn)帶8個(gè)輸出點(diǎn)，有的帶4個(gè)輸出點(diǎn)，也有帶1個(gè)或2個(gè)輸出點(diǎn)。當(dāng)負(fù)載的種類多且電流大時(shí)，采用一個(gè)“COM”點(diǎn)帶1～2個(gè)輸出點(diǎn)的產(chǎn)品，當(dāng)負(fù)載種類少數(shù)量多時(shí)，采用一個(gè)“COM”點(diǎn)帶4-8個(gè)輸出點(diǎn)產(chǎn)品。
【聯(lián)系人】： 嚴(yán)工
【業(yè)務(wù)QQ】： 1093230189
【電 話】： 0592-5709823
【傳 真】： 0592-5709828
【手 機(jī)】： 18030229052
GE FANUC IC600BF944L CIRCUIT BOARD
GE Fanuc PLC Monitor Module Circuit Board A16B-2203-0090/01A A16B22030090 01A
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General Electric 356075702 Procond Electronica Circuit Board HSWP 230V Lot of300
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General Electric Converteam 25011 REV H Circuit Board
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GENERAL ELECTRIC DS200PCCAG9ACB CIRCUIT BOARD
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GENERAL ELECTRIC DS200SDCIG2AEB CIRCUIT BOARD
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GENERAL ELECTRIC DS3800H10H1B1C CIRCUIT BOARD
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GENERAL ELECTRIC DS3800HDRC1A1A CIRCUIT BOARD *NEW IN BOX*
GENERAL ELECTRIC DS3800HFPG1D1C CIRCUIT BOARD
