MC4/11/01/400

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描述

MC4/11/01/400

在DCS控制系統(tǒng)中至少存在2個網(wǎng)絡(luò)，一個是管理層和控制層之間的通信網(wǎng)絡(luò)，另一個是過程控制層與底層I/O卡件層之間的485通信網(wǎng)絡(luò)。上層網(wǎng)絡(luò)主要的作用是實現(xiàn)管理層對控制層實時檢測，和對下層控制器的配置設(shè)置等任務(wù)。下層網(wǎng)絡(luò)是為了把I/O卡件采集的數(shù)據(jù)傳送到過程控制層，然后把控制層的控制數(shù)據(jù)傳送給I/O卡件。這2個網(wǎng)絡(luò)在DCS控制系統(tǒng)中的重要性是不言而喻的。
? ? 針對上層網(wǎng)絡(luò)模塊的冗余，當(dāng)今的工業(yè)自動化領(lǐng)域出現(xiàn)了各種各樣的支持鏈路冗余功能的工業(yè)以太網(wǎng)交換機，它們解決了由節(jié)點故障導(dǎo)致網(wǎng)絡(luò)癱瘓的問題。為提高數(shù)據(jù)通信的整體可靠性和容錯性，本DCS控制系統(tǒng)也采用環(huán)形的網(wǎng)絡(luò)拓補結(jié)構(gòu)。但是由于環(huán)形網(wǎng)本身固有的缺點是節(jié)點故障引起全網(wǎng)故障，因此數(shù)據(jù)通信鏈路的冗余技術(shù)應(yīng)運而生。為了保證2層網(wǎng)絡(luò)的順利工作，2個網(wǎng)絡(luò)都采用1∶1的冗余設(shè)置。分布處理單元檢測到主網(wǎng)出現(xiàn)故障時，自動放棄從主網(wǎng)的端口通信，同時啟用冗余網(wǎng)的端口，將數(shù)據(jù)轉(zhuǎn)由冗余網(wǎng)發(fā)送和接受。此時冗余網(wǎng)進(jìn)入數(shù)據(jù)通信狀態(tài)，主網(wǎng)及時進(jìn)行修補。雙環(huán)網(wǎng)技術(shù)實現(xiàn)了傳輸媒介的冗余，在TurboRing的基礎(chǔ)上進(jìn)一步提高了系統(tǒng)的可靠性。但雙環(huán)網(wǎng)的管理和切換都比較復(fù)雜，本系統(tǒng)采用了一種簡單的方法。

產(chǎn)品承諾：
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時發(fā)貨，
保?證售后服務(wù)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(jìn)口品牌。 專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊
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專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊

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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(dāng)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(xué)習(xí)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(guān)系理順；
3、進(jìn)而練習(xí)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(xué)會一種至于其它的學(xué)習(xí)起來也就簡單了。

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