3A99158G01

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描述

3A99158G01

從結(jié)構(gòu)上分，PLC分為固定式和組合式（模塊式）兩種。固定式PLC包括CPU板、I/O板、顯示面板、內(nèi)存塊、電源等，這些元素組合成一個(gè)不可拆卸的整體。模塊式PLC包括CPU模塊、I/O模塊、內(nèi)存、電源模塊、底板或機(jī)架，這些模塊可以按照一定規(guī)則組合配置。

CPU是PLC的核心，起神經(jīng)中樞的作用，每套PLC至少有一個(gè)CPU，它按PLC的系統(tǒng)程序賦予的功能接收并存貯用戶程序和數(shù)據(jù)，用掃描的方式采集由現(xiàn)場(chǎng)輸入裝置送來的狀態(tài)或數(shù)據(jù)，并存入規(guī)定的寄存器中，同時(shí)，診斷電源和PLC內(nèi)部電路的工作狀態(tài)和編程過程中的語法錯(cuò)誤等。進(jìn)入運(yùn)行后，從用戶程序存貯器中逐條讀取指令，經(jīng)分析后再按指令規(guī)定的任務(wù)產(chǎn)生相應(yīng)的控制信號(hào)，去指揮有關(guān)的控制電路。
CPU主要由運(yùn)算器、控制器、寄存器及實(shí)現(xiàn)它們之間聯(lián)系的數(shù)據(jù)、控制及狀態(tài)總線構(gòu)成，CPU單元還包括外圍芯片、總線接口及有關(guān)電路。內(nèi)存主要用于存儲(chǔ)程序及數(shù)據(jù)，是PLC不可缺少的組成單元。
?在使用者看來，不必要詳細(xì)分析CPU的內(nèi)部電路，但對(duì)各部分的工作機(jī)制還是應(yīng)有足夠的理解。CPU的控制器控制CPU工作，由它讀取指令、解釋指令及執(zhí)行指令。但工作節(jié)奏由震蕩信號(hào)控制。運(yùn)算器用于進(jìn)行數(shù)字或邏輯運(yùn)算，在控制器指揮下工作。寄存器參與運(yùn)算，并存儲(chǔ)運(yùn)算的中間結(jié)果，它也是在控制器指揮下工作。

CPU速度和內(nèi)存容量是PLC的重要參數(shù)，它們決定著PLC的工作速度，IO數(shù)量及軟件容量等，因此限制著控制規(guī)模。

?PLC與電氣回路的接口，是通過輸入輸出部分（I/O）完成的。I/O模塊集成了PLC的I/O電路，其輸入暫存器反映輸入信號(hào)狀態(tài)，輸出點(diǎn)反映輸出鎖存器狀態(tài)。輸入模塊將電信號(hào)變換成數(shù)字信號(hào)進(jìn)入PLC系統(tǒng)，輸出模塊相反。I/O分為開關(guān)量輸入（DI），開關(guān)量輸出（DO），模擬量輸入（AI），模擬量輸出（AO）等模塊。
? ? 開關(guān)量是指只有開和關(guān)（或1和0）兩種狀態(tài)的信號(hào)，模擬量是指連續(xù)變化的量。常用的I/O分類如下：
? ? 開關(guān)量：按電壓水平分，有220VAC、110VAC、24VDC，按隔離方式分，有繼電器隔離和晶體管隔離。
? ? 模擬量：按信號(hào)類型分，有電流型（4-20mA,0-20mA）、電壓型（0-10V,0-5V,-10-10V）等，按精度分，有12bit,14bit,16bit等。
? ? 除了上述通用IO外，還有特殊IO模塊，如熱電阻、熱電偶、脈沖等模塊。
? ? 按I/O點(diǎn)數(shù)確定模塊規(guī)格及數(shù)量，I/O模塊可多可少，但其最大數(shù)受CPU所能管理的基本配置的能力，即受最大的底板或機(jī)架槽數(shù)限制。

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(shí)力庫存商家

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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(shí)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，福克斯波羅、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(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)起來也就簡(jiǎn)單了。

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