6ES7952-1KP00-0AA0

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6ES7952-1KP00-0AA0

PLC程序的經(jīng)驗(yàn)設(shè)計(jì)法
? ? 在PLC發(fā)展的初期，沿用了設(shè)計(jì)繼電器電路圖的方法來設(shè)計(jì)梯形圖程序，即在已有的些典型梯形圖的基礎(chǔ)上，根據(jù)被控對象對控制的要求，不斷地修改和完善梯形圖。有時(shí)需要多次反復(fù)地調(diào)試和修改梯形圖，不斷地增加中間編程元件和觸點(diǎn)，最后才能得到一個(gè)較為滿意的結(jié)果。這種方法沒有普遍的規(guī)律可以遵循，設(shè)計(jì)所用的時(shí)間、設(shè)計(jì)的質(zhì)量與編程者的經(jīng)驗(yàn)有很大的關(guān)系，所以有人把這種設(shè)計(jì)方法稱為經(jīng)驗(yàn)設(shè)計(jì)法。它可以用于邏輯關(guān)系較簡單的梯形圖程序設(shè)計(jì)。
? ? 用經(jīng)驗(yàn)設(shè)計(jì)法設(shè)計(jì)PLC程序時(shí)大致可以按下面幾步來進(jìn)行：分析控制要求、選擇控制原則；設(shè)計(jì)主令元件和檢測元件，確定輸入輸出設(shè)備；設(shè)計(jì)執(zhí)行元件的控制程序；檢查修改和完善程序。
經(jīng)驗(yàn)設(shè)計(jì)法的特點(diǎn)
? ? 經(jīng)驗(yàn)設(shè)計(jì)法對于一些比較簡單程序設(shè)計(jì)是比較奏效的，可以收到快速、簡單的效果。但是，由于這種方法主要是依靠設(shè)計(jì)人員的經(jīng)驗(yàn)進(jìn)行設(shè)計(jì)，所以對設(shè)計(jì)人員的要求也就比較高，特別是要求設(shè)計(jì)者有一定的實(shí)踐經(jīng)驗(yàn)，對工業(yè)控制系統(tǒng)和工業(yè)上常用的各種典型環(huán)節(jié)比較熟悉。經(jīng)驗(yàn)設(shè)計(jì)法沒有規(guī)律可遵循，具有很大的試探性和隨意性，往往需經(jīng)多次反復(fù)修改和完善才能符合設(shè)計(jì)要求，所以設(shè)計(jì)的結(jié)果往往不很規(guī)范，因人而異。
? ? 經(jīng)驗(yàn)設(shè)計(jì)法一般適合于設(shè)計(jì)一些簡單的梯形圖程序或復(fù)雜系統(tǒng)的某一局部程序（如手動(dòng)程序等）。如果用來設(shè)計(jì)復(fù)雜系統(tǒng)梯形圖，存在以下問題：
? ? 1)．考慮不周、設(shè)計(jì)麻煩、設(shè)計(jì)周期長
? ? 用經(jīng)驗(yàn)設(shè)計(jì)法設(shè)計(jì)復(fù)雜系統(tǒng)的梯形圖程序時(shí)，要用大量的中間元件來完成記憶、聯(lián)鎖、互鎖等功能，由于需要考慮的因素很多，它們往往又交織在一起，分析起來非常困難，并且很容易遺漏一些問題。修改某一局部程序時(shí)，很可能會(huì)對系統(tǒng)其它部分程序產(chǎn)生意想不到的影響，往往花了很長時(shí)間，還得不到一個(gè)滿意的結(jié)果。
? ? 2)．梯形圖的可讀性差、系統(tǒng)維護(hù)困難
? ? 用經(jīng)驗(yàn)設(shè)計(jì)法設(shè)計(jì)的梯形圖是按設(shè)計(jì)者的經(jīng)驗(yàn)和習(xí)慣的思路進(jìn)行設(shè)計(jì)。因此，即使是設(shè)計(jì)者的同行，要分析這種程序也非常困難，更不用說維修人員了，這給PLC系統(tǒng)的維護(hù)和改進(jìn)帶來許多困難。

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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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(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”（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)起來也就簡單了。

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