ABB SA801F

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描述

ABB SA801F
GPRS技術(shù)
? ? GPRS是通用分組無(wú)線業(yè)務(wù)(GeneralPacketRadioService)的英文簡(jiǎn)稱，是在現(xiàn)有GSM系統(tǒng)上發(fā)展出來(lái)的一種新的承載業(yè)務(wù)，目的是為GSM用戶提供分組形式的數(shù)據(jù)業(yè)務(wù)。GPRS
? ? 理論帶寬可達(dá)171.2Kbps，實(shí)際應(yīng)用帶寬大約在10~70Kbps，在此信道上提供TCP/IP連接，可以用于Internet連接、數(shù)據(jù)傳輸?shù)葢?yīng)用。
? ? GPRS是一種新的移動(dòng)數(shù)據(jù)通信業(yè)務(wù)，在移動(dòng)用戶和數(shù)據(jù)網(wǎng)絡(luò)之間提供一種連接，給移動(dòng)用戶提供高速無(wú)線IP。GPRS采用分組交換技術(shù)，每個(gè)用戶可同時(shí)占用多個(gè)無(wú)線信道，同一無(wú)線信道又可以由多個(gè)用戶共享，資源被有效的利用，數(shù)據(jù)傳輸速率高達(dá)171.2Kbps。使用GPRS技術(shù)實(shí)現(xiàn)數(shù)據(jù)分組發(fā)送和接收，用戶永遠(yuǎn)在線且按流量計(jì)費(fèi)，迅速降低了服務(wù)成本。
? ? 基于GPRS技術(shù)組建的熱網(wǎng)遠(yuǎn)程監(jiān)控系統(tǒng)有如下特點(diǎn)：
? ? 永遠(yuǎn)在線GPRSDTU一開(kāi)機(jī)就能自動(dòng)附著到GPRS網(wǎng)絡(luò)上，并與數(shù)據(jù)中心建立通信鏈路，隨時(shí)收發(fā)用戶數(shù)據(jù)設(shè)備的數(shù)據(jù)，具有很高的實(shí)時(shí)性；
? ? 按流量計(jì)費(fèi)GPRSDTU一直在線，按照接收和發(fā)送數(shù)據(jù)包的數(shù)量來(lái)收取費(fèi)用，沒(méi)有數(shù)據(jù)流量的傳遞時(shí)不收費(fèi)用；
? ? 高速傳輸GPRS網(wǎng)絡(luò)的傳輸速度最快將達(dá)到160Kbps，速率的高低取決于移動(dòng)運(yùn)營(yíng)商的網(wǎng)絡(luò)設(shè)置，根據(jù)中國(guó)移動(dòng)的網(wǎng)絡(luò)情況，目前可提供20~40Kbps的穩(wěn)定數(shù)據(jù)傳輸；
? ? 組網(wǎng)簡(jiǎn)單、迅速、靈活GPRS無(wú)線DDN系統(tǒng)可以通過(guò)Internet網(wǎng)絡(luò)隨時(shí)隨地的構(gòu)建覆蓋全中國(guó)的虛擬移動(dòng)數(shù)據(jù)通信專用網(wǎng)絡(luò)，為廣大中小用戶提供接入便利，節(jié)省接入投資；
? ? 通信鏈路由專業(yè)運(yùn)營(yíng)商維護(hù)由于采用中國(guó)移動(dòng)的GPRS數(shù)據(jù)業(yè)務(wù)，因此鏈路維護(hù)也由中國(guó)移動(dòng)負(fù)責(zé)，免除通信鏈路維護(hù)的后顧之憂；
? ? 防雷擊由于采用中國(guó)移動(dòng)的GPRS數(shù)據(jù)業(yè)務(wù)，所以在不影響上網(wǎng)的前提下，GPRSDTU的發(fā)射功率非常小，天線非常短，而且無(wú)需高架，克服了有線傳輸和無(wú)線電臺(tái)傳輸容易引雷擊壞設(shè)備的缺點(diǎn)。

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(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
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Enlarge
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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(lè)，ACSO，力士樂(lè)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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