AB【1786-RPCD、1786-RPCD】模塊
AB【1786-RPCD、1786-RPCD】模塊
PLC往往使用副CPU來(lái)完成模擬量的運(yùn)算,主CPU高速地完成開(kāi)關(guān)量運(yùn)算,所以即使模擬運(yùn)算速度一般,在開(kāi)關(guān)量控制方面的速度表現(xiàn)還是非常優(yōu)秀的。而DCS以同樣的速度來(lái)處理開(kāi)關(guān)量和模擬量運(yùn)算,控制周期的指標(biāo)確實(shí)不理想。新型的DCS控制器學(xué)習(xí)了大型PLC的設(shè)計(jì),在控制周期方面的表現(xiàn)獲得了大幅度的提高。以NT6000DCS的T2550控制器為例??刂破骺梢栽O(shè)置四個(gè)不同優(yōu)先級(jí)的任務(wù),zui小運(yùn)算周期可以設(shè)為10ms,配合高速I/O卡件,控制周期能夠達(dá)到15~20ms。而模擬量運(yùn)算設(shè)置在其它周期較長(zhǎng)的任務(wù)中。 2.2、數(shù)據(jù)通訊交換 數(shù)據(jù)通訊交換主要是指控制系統(tǒng)網(wǎng)絡(luò)及其數(shù)據(jù)交換形式。在這個(gè)方面DCS有著先天的優(yōu)勢(shì)。集散系統(tǒng)的“分散”主要體現(xiàn)在獨(dú)立的控制器上,“集中”主要體現(xiàn)在具有完整數(shù)據(jù)的人機(jī)交互裝置上,而將分散和集中連接成集散系統(tǒng)的正是網(wǎng)絡(luò)。因此,從DCS發(fā)展的早期,網(wǎng)絡(luò)就成為了DCS生產(chǎn)廠家的核心技術(shù)方向,冗余技術(shù)、窄帶傳輸技術(shù)都是DCS廠家zui早研發(fā)或應(yīng)用成功的。PLC主要是按照獨(dú)立裝置來(lái)設(shè)計(jì)的,其 “網(wǎng)絡(luò)”實(shí)際上是串行通訊。 工業(yè)以太網(wǎng)技術(shù)的發(fā)展和廣泛應(yīng)用,從形式上拉平了DCS和PLC網(wǎng)絡(luò)方面的差距。從表面上看很多DCS和PLC都應(yīng)用了工業(yè)以太網(wǎng),但是其實(shí)質(zhì)上的差距卻依然存在。以很多PLC采用的MODBUS-TCP以例。MODBUS是串行通訊協(xié)議,不是網(wǎng)絡(luò),大家都沒(méi)有疑問(wèn);MODBUS-TCP是網(wǎng)絡(luò)嗎?很多人就有疑問(wèn)了。仔細(xì)分析,MODBUS-TCP是將MODBUS通訊協(xié)議加載到以太網(wǎng)的TCP協(xié)議之上的一種通訊方式,它雖然具有了網(wǎng)絡(luò)的外形,但依然是一主多從的管理方式,數(shù)據(jù)表的傳輸結(jié)構(gòu)。而DCS呢,以NT6000的ELIN網(wǎng)為例,雖然也是基于工業(yè)以太網(wǎng)的,但其應(yīng)用層協(xié)議是積累了近30年的無(wú)主令牌LIN網(wǎng)協(xié)議,在1M的OLIN,2.5M和20M的ARCNET上都有*成功的應(yīng)用。
廈門(mén)卡庫(kù)電氣各大進(jìn)口品牌DCS控制備件
AB 1771 1785 1756 1746 1747系列價(jià)格超低
施耐德140系列PLC 價(jià)格超低
GE IC697、IC693備件
ABB機(jī)器人控制備件DSQC開(kāi)頭,3H開(kāi)頭的型號(hào)及老系統(tǒng)備件
Foxboro,TRICONEX 、westinghouse ovation,力士樂(lè) INDARMAT 、
yaskawa motoman,xycom, Motorola,Force Computers ...
各*機(jī)器人控制備件
各大老系統(tǒng)備件及停產(chǎn)備件,專門(mén)解決你找不的產(chǎn)品難題
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