A413295 AIR8C

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描述

A413295 AIR8C

差錯控制是指對傳輸?shù)臄?shù)據(jù)信號進行檢測錯誤和糾正錯誤。實際中常用的差錯控制方式主要有以下4種：
自動檢錯重傳(ARQ)在這種方式中，發(fā)送端按編碼規(guī)則對擬發(fā)送的信號碼附加冗余碼后，再發(fā)送出去。接收端對收到的信號序列進行差錯檢測，判決有無錯碼，并通過反饋信道把判決結(jié)果送回到發(fā)送端。若判決有錯碼，發(fā)送端就重新發(fā)送原來的數(shù)據(jù)，直到接收端認為無差錯為止；若判決為無錯碼，發(fā)送端就可以繼續(xù)傳送下一個新的數(shù)據(jù)。
前向糾錯(FEC)在這種方式中，發(fā)送端按照一定的編碼規(guī)則對擬發(fā)送的信號碼元附加冗余碼，構(gòu)成糾錯碼。接收端將附加冗余碼元按照一定的譯碼規(guī)則進行變換，檢測信號中有無錯碼，若有錯碼，自動確定錯碼位置，并加以糾正。該方式物理實現(xiàn)簡單，無需反饋信道，適用于實時通信系統(tǒng)，但譯碼器一般比較復(fù)雜。
混合糾錯混合糾錯方式是前向糾錯與自動檢錯重傳兩種方式的綜合，發(fā)送端發(fā)送具有檢測和糾錯能力的碼元，接收端將通過反饋信道要求發(fā)送端重新發(fā)送該信息?；旌霞m錯方式綜合了ARQ和FEC兩者的優(yōu)點，卻未能克服它們各自的缺點，因而在實際應(yīng)用中受到了一定的限制。
不用編碼的差錯控制不用編碼的差錯控制是指不需要對傳輸?shù)男盘柎a元進行信號編碼，而在傳輸方法中附加冗余措施來減少傳輸中的差錯。

產(chǎn)品承諾：
保?證?全新原裝進口,
保?證?安全準時發(fā)貨，
保?證售后服務(wù)質(zhì)量，
優(yōu)勢價格，大量現(xiàn)貨。

主營DCS系統(tǒng)配件
機器人系統(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，橫河等進口品牌。Triconex?Siemens?Yaskawa?ABB?GE?Ovation?AB?Foxboro?Motorola?Schneider?XYCOM?KUKA

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選擇深圳長欣，選擇放心，售后無憂大量現(xiàn)貨，當天順豐發(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，機器人系統(tǒng)配件，大型伺服系統(tǒng)備件。

先介紹幾點經(jīng)驗。
1、先通讀一遍“系統(tǒng)手冊”（不管能不能看懂，先了解個大概，以便學習編程時查找）；
2、由位控邏輯入手，逐漸增加定時、計數(shù)等條件，把或、與、非關(guān)系理順；
3、進而練習整數(shù)運算、實數(shù)運算、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（最好是有個物理回路驗證，比如變頻器+電機+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)機器人配件DSQC系列和Motorola MVME系列，GE 卡件 模塊 驅(qū)動器系列為主攻。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，學會一種至于其它的學習起來也就簡單了。

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