2711PC-T6C20D

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描述

2711PC-T6C20D

集中式數(shù)字控制系統(tǒng)于七八十年代占主導(dǎo)地位。采用單片機(jī)、PLC、SLC或微機(jī)作為控制器，控制器內(nèi)部傳輸?shù)氖菙?shù)字信 號(hào)，因此克服了模擬儀表控制系統(tǒng)中模擬信號(hào)精度低的缺陷，提高了系統(tǒng)的抗干擾能力。集中式數(shù)字控制系統(tǒng)的優(yōu)點(diǎn)是易于根據(jù)全局情況進(jìn)行控制計(jì)算和判斷，在控制方式、控制機(jī)時(shí)的選擇上可以統(tǒng)一調(diào)度和安排；不足的是，對(duì)控制器本身要求很高，必須具有足夠的處理能力和極高的可靠性，當(dāng)系統(tǒng)任務(wù)增加時(shí)，控制器的效率和可靠性將急劇下降。集散控制系統(tǒng)（DCS）于八、九十年代占主導(dǎo)地位。其核心思想是集中管理、分散控制，即管理與控制相分離，上位機(jī)用于集中監(jiān)視管理功能，若干臺(tái)下位機(jī)下放分散到現(xiàn)場(chǎng)實(shí)現(xiàn)分布式控制，各上下位機(jī)之間用控制網(wǎng)絡(luò)互連以實(shí)現(xiàn)相互之間的信息傳遞。因此，這種分布式的控制系統(tǒng)體系結(jié)構(gòu)有力地克服了集中式數(shù)字控制系統(tǒng)中對(duì)控制器處理能力和可靠性要求高的缺陷。在集散控制系統(tǒng)中，分布式控制思想的實(shí)現(xiàn)正是得益于網(wǎng)絡(luò)技術(shù)的發(fā)展和應(yīng)用，遺憾的是，不同的DCS廠家為達(dá)到壟斷經(jīng)營(yíng) 的目的而對(duì)其控制通訊網(wǎng)絡(luò)采用各自專(zhuān)用的封閉形式，不同廠家的DCS系統(tǒng)之間以及DCS與上層Intranet、Internet信息網(wǎng)絡(luò)之間難以實(shí)現(xiàn)網(wǎng)絡(luò)互連和信息共享，因此集散控制系統(tǒng)從該角度而言實(shí)質(zhì)是一種封閉專(zhuān)用的、不具可互操作性的分布式控制系統(tǒng)且DCS造價(jià)昂貴。在這種情況下，用戶對(duì)網(wǎng)絡(luò)控制系統(tǒng)提出了開(kāi)放化和降低成本的迫切要求。FCS正是順應(yīng)以上潮流而誕生，它用現(xiàn)場(chǎng)總線這一開(kāi)放的，具有可互操作的網(wǎng)絡(luò)將現(xiàn)場(chǎng)各控制器及儀表設(shè)備互連，構(gòu)成現(xiàn)場(chǎng)總線控制系統(tǒng)，同時(shí)控制功能徹底下放到現(xiàn)場(chǎng)，降低了安裝成本和維護(hù)費(fèi)用。因此，F(xiàn)CS實(shí)質(zhì)是 一種開(kāi)放的、具可互操作性的、徹底分散的分布式控制系統(tǒng)，有望成為21世紀(jì)控制系統(tǒng)的主流產(chǎn)品?，F(xiàn)場(chǎng)總線是將自動(dòng)化最底層的現(xiàn)場(chǎng)控制器和現(xiàn)場(chǎng)智能儀表設(shè)備互連的實(shí)時(shí)控制通訊網(wǎng)絡(luò)，遵循ISO的OSI開(kāi)放系統(tǒng)互連參考模型的全部或部分通訊協(xié)議。FCS則是用開(kāi)放的現(xiàn)場(chǎng)總線控制通訊網(wǎng)絡(luò)將自動(dòng)化最底層的現(xiàn)場(chǎng)控制器和現(xiàn)場(chǎng)智能儀表設(shè)備互連的實(shí)時(shí)網(wǎng)絡(luò)控制系統(tǒng)

產(chǎn)品承諾：
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時(shí)發(fā)貨，
保?證售后服務(wù)質(zhì)量，
優(yōu)勢(shì)價(jià)格，大量現(xiàn)貨。

主營(yíng)DCS系統(tǒng)配件
機(jī)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(mén)子，摩托羅拉，安川。力士樂(lè)。ACSO，橫河等進(jìn)口品牌。 專(zhuān)業(yè)銷(xiāo)售進(jìn)口DCS? PLC系統(tǒng)備件模塊
Triconex?Siemens?Yaskawa?ABB?GE?Ovation?AB?Foxboro?Motorola?Schneider?XYCOM?KUKA ? 專(zhuān)業(yè)銷(xiāo)售進(jìn)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(guó)內(nèi)實(shí)力庫(kù)存商家

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專(zhuān)業(yè)銷(xiāo)售進(jìn)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(guó)內(nèi)實(shí)力庫(kù)存商家


選擇深圳長(zhǎng)欣，選擇放心，售后無(wú)憂大量現(xiàn)貨，當(dāng)天順豐發(fā)貨！
主營(yíng)：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(mén)子、摩托羅拉、GE發(fā)那科、安川、博世力士樂(lè)，ACSO，力士樂(lè)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。

先介紹幾點(diǎn)經(jīng)驗(yàn)。
1、先通讀一遍“系統(tǒng)手冊(cè)”（不管能不能看懂，先了解個(gè)大概，以便學(xué)習(xí)編程時(shí)查找）；
2、由位控邏輯入手，逐漸增加定時(shí)、計(jì)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(yùn)算、實(shí)數(shù)運(yùn)算、類(lèi)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(gè)物理回路驗(yàn)證，比如變頻器+電機(jī)+測(cè)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(shí)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(jī)器人配件DSQC系列和Motorola MVME系列，GE 卡件 模塊 驅(qū)動(dòng)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(huì)一種至于其它的學(xué)習(xí)起來(lái)也就簡(jiǎn)單了。

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