8810-HI-TX

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描述

8810-HI-TX

PROFIBUS通信規(guī)程采用了統(tǒng)一的介質(zhì)存取協(xié)議，此協(xié)議由OSI參考模型的第二層來實(shí)現(xiàn)。在PROFIBUS協(xié)議設(shè)計(jì)時(shí)充分考慮了滿足介質(zhì)存取控制的兩個(gè)要求，即：在主站間通信時(shí)，必須保證在分配的時(shí)間間隔內(nèi)，每個(gè)主站都有足夠的時(shí)間來完成它的通信任務(wù)，在PLC與從站（PLC或其他設(shè)備）間通信時(shí)，必須快速、簡捷地完成循環(huán)，進(jìn)行實(shí)時(shí)的數(shù)據(jù)傳輸。為此，PROFIBUS提供了兩種基本的介質(zhì)存取控制：令牌傳遞方式和主/從方式。
? ? 令牌傳遞方式可以保證每個(gè)主站在事先規(guī)定的時(shí)間間隔內(nèi)都能獲得總線的控制權(quán)。令牌是一種特殊的報(bào)文，它在主站之間傳遞著總線控制權(quán)，每個(gè)主站均能按次序獲得一次令牌，傳遞的次序是按地址升序進(jìn)行的。
? ? 主/從方式允許主站在獲得總線控制權(quán)時(shí)，可以與從站通信，每發(fā)送或獲得信息。
? ? 主站要發(fā)出信息，必須持有令牌。假設(shè)有一個(gè)由3個(gè)主站和7個(gè)從站構(gòu)成的PROFIBUS系統(tǒng)。3個(gè)主站構(gòu)成了一個(gè)令牌傳遞的邏輯環(huán)，在這個(gè)環(huán)中，令牌按照系統(tǒng)預(yù)先確定的地址升序從一個(gè)主站傳遞給下一個(gè)主站。當(dāng)一個(gè)主站得到了令牌后，它就能在一定的時(shí)間間隔內(nèi)執(zhí)行該主站的任務(wù)，可以按照主/從關(guān)系與所有從站通信，也可以按照主/主關(guān)系與所有主站通信。在總線系統(tǒng)建立的初期階段，主站的介質(zhì)存取控制(MAC)的任務(wù)是決定總線上的站點(diǎn)分配并建立令牌邏輯環(huán)。在總線的運(yùn)行期間，損壞的或斷開的主站必須從環(huán)中撤除，新接入的主站必須加入邏輯環(huán)。MAC的其他任務(wù)是檢測(cè)傳輸介質(zhì)和收發(fā)器是否損壞，檢查站點(diǎn)地址是否出錯(cuò)，以及令牌是否丟失或有多個(gè)令牌。
? ? PROFIBUS的第二層按照國際標(biāo)準(zhǔn)IEC870-5-1的規(guī)定，通過使用特殊的起始位和結(jié)束位、無間距字節(jié)異步傳輸及奇偶校驗(yàn)來保證傳輸數(shù)據(jù)的安全。PROFIBUS第二層按照非連接的模式操作，除了提供點(diǎn)對(duì)點(diǎn)通信功能外，還提供多點(diǎn)通信的功能，即廣播通信和有選擇的廣播、組播。所謂廣播通信，即主站向所有站點(diǎn)（主站和從站）發(fā)送信息，不要求回答。所謂有選擇的廣播、組播是指主站向一組站點(diǎn)（從站）。

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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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，?？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(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)起來也就簡單了。

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