描述
4.2按結(jié)構(gòu)劃分
PLC可分為箱體式及模塊式兩大類。微型機(jī)、小型機(jī)多為箱體式的,但從發(fā)展趨勢(shì)看,小型機(jī)也逐漸發(fā)展成模塊式的了。如OMRON公司,原來小型機(jī)都是箱體式,現(xiàn)在的CQM1則為模塊式的。
箱體的PLC把電源、CPU、內(nèi)存、I/O系統(tǒng)都集成在一個(gè)小箱體內(nèi)。一個(gè)主機(jī)箱體就是一臺(tái)完整的PLC,就可用以實(shí)現(xiàn)控制。控制點(diǎn)數(shù)不符需要,可再接擴(kuò)展箱體,由主箱體及若干擴(kuò)展箱體組成較大的系統(tǒng),以實(shí)現(xiàn)對(duì)較多點(diǎn)數(shù)的控制。
模塊式的PLC是按功能分成若干模塊,如CPU模塊、輸入模塊、輸出模塊、電源模塊等等。大型機(jī)的模塊功能更單一一些,因而模塊的種類也相對(duì)多些。這也可說是趨勢(shì)。目前一些中型機(jī),其模塊的功能也趨于單一,種類也在增鄉(xiāng)。如同樣OMRON公司C20系列PLC,H機(jī)的CPU單元就含有電源,而Ha機(jī)則把電源分出,有單獨(dú)的電源模塊。
模塊功能更單一、品種更多,可便于系統(tǒng)配置,使PLC更能物盡其用,達(dá)到更高的使用效益。
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(shí)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填補(bǔ)。
歐美品牌停產(chǎn)的,常用的“PLC”備品備件
我司產(chǎn)品應(yīng)用于以下領(lǐng)域:
1,《發(fā)電廠DCS監(jiān)控系統(tǒng)》
2,《智能平鋼化爐系統(tǒng)制造》
3,《PLC可編程輸送控制系統(tǒng)》
4,《DCS集散控制系統(tǒng)》
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5,《智能型消防供水控制系統(tǒng)》
6,《化工廠藥液恒流量計(jì)算機(jī)控制系統(tǒng)》
7,《電氣控制系統(tǒng)》造紙,印染生產(chǎn)線,變電站綜合自動(dòng)化控制系列
本特利,英維思,伍德沃德,福克斯波羅、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂,ACSO,力士樂等各大品牌的DCS系統(tǒng)配件,機(jī)器人系統(tǒng)配件,大型伺服系統(tǒng)備件。
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