2711P-T10C4D8

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描述

2711P-T10C4D8

在計算機控制系統(tǒng)出現(xiàn)以后,工程實踐中廣泛使用模擬儀表系統(tǒng)中的傳感器、變送器和執(zhí)行機構(gòu)。其信號傳送一般采用4-20mA的電流信號形式,一個變送器或執(zhí)行機構(gòu)需要一對傳輸線來單向傳送一個模擬信號。這種傳輸方法使用的導線多,現(xiàn)場安裝及調(diào)試的工作量大,投資高,傳輸精度和抗干擾能力較低,不便維護。主控室的工作人員無法了解現(xiàn)場儀表的實際情況,不能對其進行參數(shù)調(diào)整和故障診斷,所以處于最底層的模擬變送器和執(zhí)行機構(gòu)成了計算機控制系統(tǒng)中最薄弱的環(huán)節(jié),即所謂DCS系統(tǒng)的發(fā)展瓶頸?,F(xiàn)場總線正是在這種情況下應(yīng)運而生。現(xiàn)場總線技術(shù)是在80年代后期發(fā)展起來的一種先進的現(xiàn)場工業(yè)控制技術(shù),它綜合了數(shù)字通信技術(shù)、計算機技術(shù)、自動控制技術(shù)、網(wǎng)絡(luò)技術(shù)和智能儀表等多種技術(shù)手段,從根本上突破了傳統(tǒng)的“點對點”式的模擬信號或數(shù)字一模擬信號控制的局限性,構(gòu)成一種全分散、全數(shù)字化、智能、雙向、互連、多變量、多接點的通信與控制系統(tǒng)。現(xiàn)場總線則是連接智能現(xiàn)場設(shè)備和自動化系統(tǒng)的數(shù)字式、雙向傳輸、多分支結(jié)構(gòu)的通信網(wǎng)絡(luò),其基礎(chǔ)是智能儀表。分散在各個工業(yè)現(xiàn)場的智能儀表通過數(shù)字現(xiàn)場總線連為一體,并與控制室中的控制器和監(jiān)視器一起共同構(gòu)成現(xiàn)場總線控制系統(tǒng)(Fieldbus Control System,F(xiàn)CS)。通過遵循一定的國際標準,可以將不同廠商的現(xiàn)場總線產(chǎn)品集成在同一套FCS中,具有互換性和互操作性。FCS把傳統(tǒng)DCS的控制功能進一步下放到現(xiàn)場智能儀表,由現(xiàn)場智能儀表完成數(shù)據(jù)采集、數(shù)據(jù)處理、控制運算和數(shù)據(jù)輸出等功能?,F(xiàn)場儀表的數(shù)據(jù)(包括采集的數(shù)據(jù)和診斷數(shù)據(jù))通過現(xiàn)場總線傳到控制室的控制設(shè)備上,控制室的控制設(shè)備用來監(jiān)視各個現(xiàn)場儀表的運行狀態(tài),保存各智能儀表上傳的數(shù)據(jù),同時完成少量現(xiàn)場儀表無法完成的高級控制功能。另外,F(xiàn)CS還可通過網(wǎng)關(guān)和企業(yè)的上級管理網(wǎng)絡(luò)相連,以便企業(yè)管理者掌握第一手資料,為決策提供依據(jù)。所以現(xiàn)場總線具有以下突出特點:

產(chǎn)品承諾:
保?證?全新原裝進口,
保?證?安全準時發(fā)貨,
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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
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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(guān)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。