Triconex 3805E

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描述

Triconex 3805E

磁盤陣列內(nèi)的硬盤是否有順序要求?
也就是說(shuō)，硬盤是否可以不按原先的次序插回陣列中，而數(shù)據(jù)仍能正常存取?很多人都想當(dāng)然地認(rèn)為根本不應(yīng)該有順序要求，其實(shí)不然。我們?cè)眠^(guò)一個(gè)陣列，其必須按照原來(lái)的次序才能正常存取數(shù)據(jù)?，F(xiàn)在假設(shè)這樣一種情況，我們準(zhǔn)備清理一下硬盤陣列，把所有硬盤都放在一起，結(jié)果記不住順序了，為了正常存取數(shù)據(jù)，我們只有一個(gè)個(gè)地試，而對(duì)于有8塊硬盤的陣列來(lái)說(shuō)，最壞的情況要試88次才行。現(xiàn)在已出現(xiàn)了磁盤陣列產(chǎn)品具有不要求硬盤順序的功能，為了防止上述事件發(fā)生，應(yīng)選擇對(duì)順序沒有要求的陣列。
是硬件磁盤陣列還是軟件磁盤陣列?
軟件磁盤陣列指的是用一塊SCSI卡與磁盤連接，硬件磁盤陣列指的是陣列柜中具有背板的陣列，它與軟件磁盤陣列的區(qū)別很大。硬件磁盤陣列是一個(gè)完整的磁盤陣列系統(tǒng)與系統(tǒng)相接，內(nèi)置CPU，與主機(jī)并行動(dòng)作，所有的I/O都在磁盤陣列中完成，減輕主機(jī)的負(fù)擔(dān)，增加系統(tǒng)整體性能，有SCSI總線主控與DMA通道，以加速數(shù)據(jù)的存取與傳輸。而軟件磁盤陣列是一個(gè)程序，在主機(jī)上執(zhí)行，通過(guò)一塊SCSI卡與磁盤相接形成陣列，其最大的缺點(diǎn)是大大增加了主機(jī)的負(fù)擔(dān)，對(duì)于大量輸入輸出的系統(tǒng)，很容易使系統(tǒng)癱瘓。顯然，應(yīng)盡量選擇硬件磁盤陣列。
是IDE磁盤陣列還是SCSI磁盤陣列?
最近市場(chǎng)上出現(xiàn)了IDE磁盤陣列，它們的速度挺快，如增強(qiáng)型IDE在PCI總線下的傳輸速率可達(dá)66MB/s，價(jià)格與SCSI磁盤陣列相比要便宜得多;而SCSIUltra3速率接近160MB/s。但從實(shí)際應(yīng)用情況來(lái)看，在單任務(wù)時(shí)，IDE磁盤陣列比SCSI磁盤陣列快;在多任務(wù)時(shí)，SCSI磁盤陣列比IDE磁盤陣列要快得多。但I(xiàn)DE磁盤陣列有一個(gè)致命的缺點(diǎn)：不能帶電熱插拔。這個(gè)缺點(diǎn)使IDE磁盤陣列命中注定只能使用于非重要場(chǎng)合。如果您的應(yīng)用不能停機(jī)，則一定要選擇SCSI磁盤陣列。

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，
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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(guó)內(nèi)實(shí)力庫(kù)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(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(lái)也就簡(jiǎn)單了。

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