6SM27LL-4.500

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描述

6SM27LL-4.500

　PLC控制系統(tǒng)由于具有功能強(qiáng)、程序設(shè)計(jì)簡(jiǎn)單、擴(kuò)展性好、維護(hù)方便、可靠性高、能適應(yīng)比較惡劣的工業(yè)環(huán)境的特點(diǎn),因此在工業(yè)企業(yè)廣泛應(yīng)用.但是由于工業(yè)環(huán)境條件惡劣,以及各種工業(yè)電磁,輻射干擾等,影響PLC控制系統(tǒng)的正常工作,因此必須重視PLC控制系統(tǒng)的抗干擾設(shè)計(jì).為防止干擾,可以采用硬件和軟件相結(jié)合的抗干擾方法. 防止硬件干擾的方法有:1采用性能優(yōu)良的電源來(lái)抑制電網(wǎng)引入的干擾2電纜的選擇與鋪設(shè)來(lái)降低電磁干擾3完善接地系統(tǒng)4采用光電隔離來(lái)抑制輸入輸出電路引入的干擾等.而利用PLC軟件來(lái)減少干擾是PLC控制系統(tǒng)正常、穩(wěn)定工作的重要環(huán)節(jié).下面主要分析在生產(chǎn)實(shí)踐中應(yīng)用的利用PLC組態(tài)軟件來(lái)減少干擾的方法:
　　一、減少數(shù)字量輸入擾動(dòng)的方法
　　1、 計(jì)數(shù)器法
　　　　CON—計(jì)數(shù)器
　　　　NOT—非門(mén)
　　　　RS—復(fù)位優(yōu)先觸發(fā)器
　　　　IN—輸入
　　　　OUT—輸出
　　　　N—脈沖采樣個(gè)數(shù)
　　注釋?zhuān)寒?dāng)外部有信號(hào)輸入時(shí)，控制系統(tǒng)采集連續(xù)的N個(gè)脈沖使RS觸發(fā)器輸出為“1”，只有當(dāng)外部輸入信號(hào)由“1”變成“0”時(shí)，RS觸發(fā)器的復(fù)位端為“1”，將RS觸發(fā)器的輸出復(fù)位成“0”。而當(dāng)有瞬間干擾脈沖時(shí)，CON計(jì)數(shù)器將采集不到連續(xù)的N個(gè)脈沖，CON計(jì)數(shù)器無(wú)法輸出，這就起到了減少干擾的作用。（N一般情況下取2）
　優(yōu)點(diǎn)：響應(yīng)速度快，對(duì)周期性的瞬時(shí)干擾起到了一定的抑制作用。
　缺點(diǎn)：不能消除超過(guò)CON計(jì)數(shù)器采樣時(shí)間的干擾。

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(yōu)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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