FC-SDO-0824

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描述

FC-SDO-0824

?在最初的技術(shù)規(guī)格說明書中，串行ATA主要是用作PC機(jī)箱內(nèi)部硬盤驅(qū)動器的替代品。最初的電纜技術(shù)規(guī)格說明書描述了一個設(shè)計用于內(nèi)部使用的1米電纜，它不具有關(guān)于電磁干擾(EMI)、靜電放電（ESD）方面的任何特殊功能或者是外部互連所需要的其他屬性。由于對外部串行ATA驅(qū)動器的需求趨勢日益明朗，串行ATA工作組開始調(diào)查對更適合外部驅(qū)動器的新電纜與連接器的需求，并制訂出一個新的技術(shù)規(guī)格說明書來滿
? ? 足這些需求。電纜與連接器技術(shù)規(guī)格說明書包含于新的技術(shù)規(guī)格說明書之中–即，串行ATAII技術(shù)規(guī)格說明書：電纜與連接器，第2卷。具體的電氣信號需求包含于《串行ATAII技術(shù)規(guī)格說明書：物理層》之中。
? ? 對于用戶友好型可靠外部互連需求來說，需要考慮若干因素。對于一個使用USB或者1394接口的典型外部存儲設(shè)備，纜需要足夠長，以致于能夠從放在地面上的PC連到放在臺式機(jī)上的驅(qū)動器上。為了滿足這種很可能的應(yīng)用場景需求，它的電纜長度應(yīng)從1米增加到標(biāo)稱2米。為了防止電纜意外脫落，這種電纜還應(yīng)設(shè)計一些需要稍微大一點的力來插入或者移走的定位止動功能。圖2所示的電纜與連接器突出強(qiáng)調(diào)了這些增加功能，包括驅(qū)動器或者PC插座上的彈簧片，以及彈簧夾夾緊處電纜末端連接器的定位止動裝置等。
? ? 用于外部用戶SATA電纜的新型電纜末端連接器與PCB插座的CAD模型
? ? 除了電纜與連接器機(jī)械方面之外，技術(shù)規(guī)格說明書還考慮了一些電氣問題以確保外部連接的驅(qū)動器滿足靜電放電(ESD)與電磁干擾(EMI)輻射與敏感性的規(guī)章要求。圖3還顯示了使用罩在信號導(dǎo)線所有四個側(cè)面上的一個金屬屏蔽罩來屏蔽連接器，而且連接器末端還有凸邊，用來確保為驅(qū)動器與PC機(jī)殼提供一個良好接地通路。同時，電纜末端連接器所有四個側(cè)面都有金屬保護(hù)，確保在電纜與連接器之間提供良好的接地。
? ? 與標(biāo)準(zhǔn)內(nèi)部連接器相比，插座中的信號觸點凹進(jìn)插座盒凹得更深，這將有助于預(yù)防接近高速信號觸點的任何靜電放電。使用金屬屏蔽罩可以提供一個良好的接地回路，它將在插入或者拔掉電纜的時候釋放掉任何靜電放電電荷。
? ? 這里提供的接地通路將有助于來自外部驅(qū)動器的任何電磁干擾(EMI)輻射的最小化，但是還需要采取額外步驟，通過增加一個包裹電纜不同信號對的特別屏蔽層來改裝電纜。在一個標(biāo)準(zhǔn)內(nèi)部電纜內(nèi)，每一對信號線都被分別屏蔽。這種屏蔽用于外部電纜，但是還要進(jìn)行額外的包裹。
? ? 正如上面總結(jié)的變化所展示的那樣，在用于內(nèi)部與外部串行ATA應(yīng)用的電纜與連接器結(jié)構(gòu)之間存在有重要差異，以適用于特定的使用需求。因為存在著這些差異，連接器就可以被鎖住以防止在外部應(yīng)用中誤用未經(jīng)屏蔽的內(nèi)部電纜，它將是不合適的。為了實現(xiàn)這個目標(biāo)，插座內(nèi)的內(nèi)部信號連接器被做的更寬，而電纜末端連接器的總寬度更窄，因此內(nèi)部電纜不能被插到外部連接器當(dāng)中。另一種區(qū)分兩個連接器的簡便方式就是內(nèi)部電纜有一個L型舌片，作為簡單的盲配（blindmate）鑰匙。對于外部連接器來說，通過將連接器內(nèi)的信號觸點從中心移開來完成盲配（blindmating）定位。
? ? 值得一提的根本區(qū)別在于一個內(nèi)部電纜不應(yīng)被經(jīng)常拔插，因此它設(shè)計耐受50次插拔操作。對于一個外部附連的硬盤驅(qū)動器，它的耐受次數(shù)應(yīng)該更高，因此電纜與連接器設(shè)計用于支持5000次插拔操作。

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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，?？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(xué)習(xí)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(jìn)而練習(xí)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(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)會一種至于其它的學(xué)習(xí)起來也就簡單了。

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