TRICONEX 3502e

分類：
選擇深圳長欣，選擇放心，售后無憂
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描述

TRICONEX 3502e

PLC控制系統(tǒng)設(shè)計(jì)包括硬件設(shè)計(jì)和軟件設(shè)計(jì)。
　　1.PLC控制系統(tǒng)的硬件設(shè)計(jì)
　　硬件設(shè)計(jì)是PLC控制系統(tǒng)的至關(guān)重要的一個(gè)環(huán)節(jié)，這關(guān)系著PLC控制系統(tǒng)運(yùn)行的可靠性、安全性、穩(wěn)定性。主要包括輸入和輸出電路兩部分。
　　(1)PLC控制系統(tǒng)的輸入電路設(shè)計(jì)。PLC供電電源一般為AC85-240V，適應(yīng)電源范圍較寬，但為了抗干擾，應(yīng)加裝電源凈化元件(如電源濾波器、1：1隔離變壓器等);隔離變壓器也可以采用雙隔離技術(shù)，即變壓器的初、次級(jí)線圈屏蔽層與初級(jí)電氣中性點(diǎn)接大地，次級(jí)線圈屏蔽層接PLC輸入電路的地，以減小高低頻脈沖干擾。
　　PLC輸入電路電源一般應(yīng)采用DC24V,同時(shí)其帶負(fù)載時(shí)要注意容量，并作好防短路措施，這對(duì)系統(tǒng)供電安全和PLC安全至關(guān)重要，因?yàn)樵撾娫吹倪^載或短路都將影響PLC的運(yùn)行，一般選用電源的容量為輸入電路功率的兩倍，PLC輸入電路電源支路加裝適宜的熔絲，防止短路。
　　(2)PLC控制系統(tǒng)的輸出電路設(shè)計(jì)。依據(jù)生產(chǎn)工藝要求，各種指示燈、變頻器/數(shù)字直流調(diào)速器的啟動(dòng)停止應(yīng)采用晶體管輸出，它適應(yīng)于高頻動(dòng)作，并且響應(yīng)時(shí)間短;如果PLC系統(tǒng)輸出頻率為每分鐘6次以下，應(yīng)首選繼電器輸出，采用這種方法，輸出電路的設(shè)計(jì)簡(jiǎn)單，抗干擾和帶負(fù)載能力強(qiáng)。
　　如果PLC輸出帶電磁線圈等感性負(fù)載，負(fù)載斷電時(shí)會(huì)對(duì)PLC的輸出造成浪涌電流的沖擊，為此，對(duì)直流感性負(fù)載應(yīng)在其旁邊并接續(xù)流二極管，對(duì)交流感性負(fù)載應(yīng)并接浪涌吸收電路，可有效保護(hù)PLC。
　　當(dāng)PLC掃描頻率為10次/min以下時(shí)，既可以采用繼電器輸出方式，也可以采用PLC輸出驅(qū)動(dòng)中間繼電器或者固態(tài)繼電器(SSR)，再驅(qū)動(dòng)負(fù)載。
　　對(duì)于兩個(gè)重要輸出量，不僅在PLC內(nèi)部互鎖，建議在PLC外部也進(jìn)行硬件上的互鎖，以加強(qiáng)PLC系統(tǒng)運(yùn)行的安全性、可靠性。
　　對(duì)于常見的AC220V交流開關(guān)類負(fù)載，例如交流接觸器、電磁閥等，應(yīng)該通過DC24V微小型中間繼電器驅(qū)動(dòng)，避免PLC的DO接點(diǎn)直接驅(qū)動(dòng)，盡管PLC手冊(cè)標(biāo)稱具有AC220V交流開關(guān)類負(fù)載驅(qū)動(dòng)能力。
　　(3)PLC控制系統(tǒng)的抗干擾設(shè)計(jì)。隨著工業(yè)自動(dòng)化技術(shù)的日新月異的發(fā)展，晶閘管可控整流和變頻調(diào)速裝置使用日益廣泛，這帶來了交流電網(wǎng)的污染，也給控制系統(tǒng)帶來了許多干擾問題，防干擾是PLC控制系統(tǒng)設(shè)計(jì)時(shí)必須考慮的問題。一般采用以下幾種方式：
　　隔離：由于電網(wǎng)中的高頻干擾主要是原副邊繞組之間的分布電容耦合而成，所以建議采用1：1超隔離變壓器，并將中性點(diǎn)經(jīng)電容接地。
　　屏蔽：一般采用金屬外殼屏蔽，將PLC系統(tǒng)內(nèi)置于金屬柜之內(nèi)。金屬柜外殼可靠接地，能起到良好的靜電、磁場(chǎng)屏蔽作用，防止空間輻射干擾。
　　布線：強(qiáng)電動(dòng)力線路、弱電信號(hào)線分開走線，并且要有一定的間隔;模擬信號(hào)傳輸線采用雙絞線屏蔽電纜。

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
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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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