MVME51105E-2261

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描述

MVME51105E-2261

DCS是一種“分散式控制系統(tǒng)”,而PLC(可編程控制器)只是一種控制“裝置”,兩者是“系統(tǒng)”與“裝置”的區(qū)別。系統(tǒng)可以實現(xiàn)任何裝置的功能與協(xié)調(diào),PLC裝置只實現(xiàn)本單元所具備的功能。
在網(wǎng)絡方面,DCS網(wǎng)絡是整個系統(tǒng)的中樞神經(jīng),它是安全可靠雙冗余的高速通訊網(wǎng)絡,系統(tǒng)的拓展性與開放性更好。而PLC因為基本上都為個體工作,其在與別的PLC或上位機進行通訊時,所采用的網(wǎng)絡形式基本都是單網(wǎng)結(jié)構(gòu),網(wǎng)絡協(xié)議也經(jīng)常與國際標準不符。在網(wǎng)絡安全上,PLC沒有很好的保護措施。我們采用電源,CPU,網(wǎng)絡雙冗余。
DCS整體考慮方案,操作員站都具備工程師站功能,站與站之間在運行方案程序下裝后是一種緊密聯(lián)合的關系,任何站、任何功能、任何被控裝置間都是相互連鎖控制,協(xié)調(diào)控制;而單用PLC互相連接構(gòu)成的系統(tǒng),其站與站(PLC與PLC)之間的聯(lián)系則是一種松散連接方式,是做不出協(xié)調(diào)控制的功能。
DCS在整個設計上就留有大量的可擴展性接口,外接系統(tǒng)或擴展系統(tǒng)都十分方便,PLC所搭接的整個系統(tǒng)完成后,想隨意的增加或減少操作員站都是很難實現(xiàn)的。
DCS安全性:為保證DCS控制的設備的安全可靠,DCS采用了雙冗余的控制單元,當重要控制單元出現(xiàn)故障時,都會有相關的冗余單元實時無擾的切換為工作單元,保證整個系統(tǒng)的安全可靠。PLC所搭接的系統(tǒng)基本沒有冗余的概念,就更談不上冗余控制策略。特別是當其某個PLC單元發(fā)生故障時,不得不將整個系統(tǒng)停下來,才能進行更換維護并需重新編程。所以DCS系統(tǒng)要比其安全可靠性上高一個等級。
系統(tǒng)軟件,對各種工藝控制方案更新是DCS的一項最基本的功能,當某個方案發(fā)生變化后,工程師只需要在工程師站上將更改過的方案編譯后,執(zhí)行下裝命令就可以了,下裝過程是由系統(tǒng)自動完成的,不影響原控制方案運行。系統(tǒng)各種控制軟件與算法可以將工藝要求控制對象控制精度提高。而對于PLC構(gòu)成的系統(tǒng)來說,工作量極其龐大,首先需要確定所要編輯更新的是哪個PLC,然后要用與之對應的編譯器進行程序編譯,最后再用專用的機器(讀寫器)專門一對一的將程序傳送給這個PLC,在系統(tǒng)調(diào)試期間,大量增加調(diào)試時間和調(diào)試成本,而且極其不利于日后的維護。在控制精度上相差甚遠。這就決定了為什么在大中型控制項目中(500點以上),基本不采用全部由PLC所連接而成的系統(tǒng)的原因。
模塊:DCS系統(tǒng)所有I/O模塊都帶有CPU,可以實現(xiàn)對采集及輸出信號品質(zhì)判斷與標量變換,故障帶電插拔,隨機更換。而PLC模塊只是簡單電氣轉(zhuǎn)換單元,沒有智能芯片,故障后相應單元全部癱瘓。
現(xiàn)在高端的PLC與DCS的功能已經(jīng)差不多,DCS對網(wǎng)絡和分布式數(shù)據(jù)庫還要定時掃描有較強的功能,同時對運算和模擬量的處量比較拿手。
PLC還分大、中、小、微PLC,其中微型的只賣幾百塊到2000塊,點數(shù)也好少,大型的可以帶數(shù)千點,運算能力與DCS差不多,但對多機聯(lián)網(wǎng)功能較弱?,F(xiàn)在兩個技術平臺都差不多,只是重點不一樣。

產(chǎn)品承諾:
保?證?全新原裝進口,
保?證?安全準時發(fā)貨,
保?證售后服務質(zhì)量,
優(yōu)勢價格,大量現(xiàn)貨。

主營DCS系統(tǒng)配件
機器人系統(tǒng)配件
大型伺服系統(tǒng)配件
品牌:ABB???,AB??,GE,FOXBORO,本特利,英維思,伍德沃德,西屋,瑞恩,施耐德,西門子,摩托羅拉,安川。力士樂。ACSO,橫河等進口品牌。 專業(yè)銷售進口DCS? PLC系統(tǒng)備件模塊
Triconex?Siemens?Yaskawa?ABB?GE?Ovation?AB?Foxboro?Motorola?Schneider?XYCOM?KUKA
? 專業(yè)銷售進口DCS? PLC系統(tǒng)備件模塊 15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國內(nèi)實力庫存商家

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專業(yè)銷售進口DCS? PLC系統(tǒng)備件模塊

PLC模塊,可編程控制器,CPU模塊,IO模塊,AI模塊,通訊模塊。AB/施耐德/ABB/GE/本特利/西屋/英維斯/霍尼韋爾/黑馬/FU克斯波羅

15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國內(nèi)實力庫存商家


選擇深圳長欣,選擇放心,售后無憂大量現(xiàn)貨,當天順豐發(fā)貨!
主營:本特利,英維思,伍德沃德,??怂共_、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,機器人系統(tǒng)配件,大型伺服系統(tǒng)備件。

先介紹幾點經(jīng)驗。
1、先通讀一遍“系統(tǒng)手冊”(不管能不能看懂,先了解個大概,以便學習編程時查找);
2、由位控邏輯入手,逐漸增加定時、計數(shù)等條件,把或、與、非關系理順;
3、進而練習整數(shù)運算、實數(shù)運算、類型轉(zhuǎn)換;
4、量程轉(zhuǎn)換、PID調(diào)節(jié)回路的建立及P、I、D參數(shù)的理解(最好是有個物理回路驗證,比如變頻器+電機+測速傳感器);
5、循環(huán)、順序、跳轉(zhuǎn)等程序控制(盡量避免跳轉(zhuǎn),非跳不可時也是跳的越近越好);
6、中斷、通訊、位置控制....

本人以ABB工業(yè)機器人配件DSQC系列和Motorola MVME系列,GE 卡件 模塊 驅(qū)動器系列為主攻。各位電工朋友可根據(jù)自己的條件選擇適合自己的PLC品牌,由于PLC的基本框架大同小異,學會一種至于其它的學習起來也就簡單了。