FF-SRS60252

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描述

FF-SRS60252

PLC是由摸仿原繼電器控制原理發(fā)展起來的,二十世紀(jì)七十年代的PLC只有開關(guān)量邏輯控制,首先應(yīng)用的是汽車制造行業(yè)。它以存儲執(zhí)行邏輯運算、順序控制、定時、計數(shù)和運算等操作的指令;并通過數(shù)字輸入和輸出操作,來控制各類機械或生產(chǎn)過程。用戶編制的控制程序表達(dá)了生產(chǎn)過程的工藝要求,并事先存入PLC的用戶程序存儲器中。運行時按存儲程序的內(nèi)容逐條執(zhí)行,以完成工藝流程要求的操作。PLC的CPU內(nèi)有指示程序步存儲地址的程序計數(shù)器,在程序運行過程中,每執(zhí)行一步該計數(shù)器自動加1,程序從起始步(步序號為零)起依次執(zhí)行到最終步(通常為END指令),然后再返回起始步循環(huán)運算。PLC每完成一次循環(huán)操作所需的時間稱為一個掃描周期。不同型號的PLC,循環(huán)掃描周期在1微秒到幾十微秒之間。PLC用梯形圖編程,在解算邏輯方面,表現(xiàn)出快速的優(yōu)點,在微秒量級,解算1K邏輯程序不到1毫秒。它把所有的輸入都當(dāng)成開關(guān)量來處理,16位(也有32位的)為一個模擬量。大型PLC使用另外一個CPU來完成模擬量的運算。把計算結(jié)果送給PLC的控制器。
  相同I/O點數(shù)的系統(tǒng),用PLC比用DCS,其成本要低一些(大約能省40%左右)。PLC沒有專用操作站,它用的軟件和硬件都是通用的,所以維護成本比DCS要低很多。一個PLC的控制器,可以接收幾千個I/O點(最多可達(dá)8000多個I/O)。如果被控對象主要是設(shè)備連鎖、回路很少,采用PLC較為合適。PLC由于采用通用監(jiān)控軟件,在設(shè)計企業(yè)的管理信息系統(tǒng)方面,要容易一些。
  近10年來,隨著PLC價格的不斷降低和用戶需求的不斷擴大,越來越多的中小設(shè)備開始采用PLC進(jìn)行控制,PLC在我國的應(yīng)用增長十分迅速。隨著中國經(jīng)濟的高速發(fā)展和基礎(chǔ)自動化水平的不斷提高,今后一段時期內(nèi)PLC在我國仍將保持高速增長勢頭。
  通用PLC應(yīng)用于專用設(shè)備時可以認(rèn)為它就是一個嵌入式控制器,但PLC相對一般嵌入式控制器而方具有更高的可靠性和更好的穩(wěn)定性。實際工作中碰到的一些用戶原來采用嵌入式控制器,現(xiàn)在正逐步用通用PLC或定制PLC取代嵌入式控制器,PLC產(chǎn)業(yè)一定會有一個美好的未來 。

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
Triconex?Siemens?Yaskawa?ABB?GE?Ovation?AB?Foxboro?Motorola?Schneider?XYCOM?KUKA
? 專業(yè)銷售進(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? 國內(nèi)實力庫存商家

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HP 8554B Spectrum Analyzer with RF Section

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36 Ultrak SSI1OODX Diamond Small System Interface

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Impulse Bag Sealer 48 INCH

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專業(yè)銷售進(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。