DO86-16
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廈門莫格電氣自動化有限公司經過幾年的快速發展，現已成為國內實力的工控備件商之一，
主營AB 、本特利、黑馬、施耐德、 GE、 ABB【DSQC系列】 英維思 西門子摩爾等品牌。
在價格上我們有很大的優勢、產品詳細信息、竭誠歡迎您來電查詢！
DO86-16
廈門莫格電氣自動化有限公司是一家專業提供工業自動化領域的備件服務商，產品品種齊全、價格合理，公司實力雄厚，重信用、守合同、保證產品質量，以多品種經營特色和薄利多銷的原則，贏得了廣大客戶的信任。
我們主營PLC可編程控制器模塊，DCS卡件，ESD系統卡件，振動監測系統卡件，汽輪機控制系統模塊，燃氣發電機備件等，公司致力于為工業用戶提供自動化解決方案，打造工控備件一站式供應平臺。
我們與世界的多家PLC，DCS產品維護服務供應商建立了緊密的合作關系。能直接從境外進貨、能夠提供不同國別、廠商的設備以及備件、包括一些停產的老系統備件，解決您多處尋找的麻煩或對產品質量問題的擔心等，在價格上我們有很大的優勢、產品詳細信息、竭誠歡迎您來電查詢或使用 查詢！
我們售出的備品備件均提供一年的質量保證、并且都經過了嚴格的測試和認證,現已成一家性的工業自動化備件及零部件的銷售企業。
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【本公司擁有所有產品專業檢測平臺，產品質量嚴格把關】
公司以電子商務模式運營、縮減中間環節、為消費者在*時間提供優質的產品及滿意的服務，公司擁有完善的物流供應系統、現已與眾多國外品牌生產廠商建立了良好的合作關系。
公司經銷產品廣泛應用于數控機械 冶金、石油天然氣、石油化工、化工、造紙印刷、紡織印染、機械、電子制造、汽車制造、煙草、塑膠機械、電力、水利、水處理/環保、市政工程、鍋爐供暖、能源、輸配電等行業
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工業以太網可以分為兩大類：用于過程控制領域的工業以太網（例如HSE）以及用于離散控制領域的工業以太網（例如EPL）。兩者的共同之處在于網絡響應時間具有統一的模型，網絡中的延遲都是其中的重要組成部分。整個工業以太網系統的實時性能是由網絡響應時間反映的，影響網絡響應時間的因素主要來自三個部分：本地系統（即源節點的處理）、工業以太網網絡（即傳輸部分）、目的節點系統（即目的節點的處理）。某種報文的實時性得到滿足是指其報文響應時間小于規定的時限，某個節點的實時性合乎要求是指該節點發出的所有報文在的時限內都能獲得響應。整個控制網絡的實時性符合要求是指分布在網絡上每一個節點的每一種報文的實時性均得到保證。為滿足整個網絡的實時性，對報文傳輸給予下列三個時間約束條件，則可以*程度地降低網絡的延遲：
（1）每個節點獲得通信權的時間有上限值限制。若超過此值，無論本次通信任務是否完成，均應立即釋放通信權。這一時間約束可防止某一節點長時間占用總線而導致其它各節點實時性惡化；
（2）應當保證在某一固定的時間周期內，網絡上的每一個節點都有機會取得通信權，以防個別節點因長時間得不到通信權而使其實時性太差甚至喪失實時性。只要有一個節點出現這種情況，整個網絡的實時性就得不到保證。這一固定時間周期的長短是控制網絡實時性好壞的一個衡量標準；
（3）對于緊急任務，當其實時性要求臨時變得很高時，應當給以優先服務。對于實時性要求比較高的節點，也應當使它取得通信權的機會比其它節點多一些。因此采用靜態（固定）的方式賦予某些節點較高的優先權，采用動態（臨時）的方式賦予某些通信任務以比較高的優先權，則將使緊急任務及重要節點的實時性得到滿足。
2.3 IEC-61588（2009）實現
為滿足智能電網的實時與互動，尤其是電能采集系統，其前端的各種傳感器連接到數據采集板，板上安裝的精確時鐘通過IEEE1588協議的以太網與系統主時鐘同步，使傳感器的同步時間發生在1μs內，每秒鐘內要執行200次測量，測量間隔5ms，傳感器的輪換時間是1μs。控制系統內的多種測量儀器在時間對準后，按本地時鐘捕捉數據和分析數據，清除了觸發產生的延遲。這種利用IEEE1588協議的以太網數據采集系統，節省大量分別連接每個傳感器的線纜，達到精確定時同步，便于遠控測量，成本降低。
當前工業自動化使用IRIGB格式時間碼，每天時間準確度小于1μs。而IEEE1588更加具有潛力，可將控制系統的每天時間準確度推進到100ns。原因IEEE1588協議可直接將每天時間信息從主控時鐘發送到客戶時鐘，更具有優勢。從智能電網發展趨勢來看，采用IEEE1588協議的以太網將會更適合智能電網。
更為重要的是采用IEEE1588協議的以太網，解決了通用以太網延遲時間長和同步能力差的瓶頸，在電能監測應用中將發揮更大作用。確定時間偏移的典型方法是使用同步消息來確定對主機的偏差。使用平均或濾波的方式來平滑連接，并避免每次測量的過量校正。對于時間校正來說，可利用兩個不同的機制來檢測和校正時間偏差。
*個機制的基本想法是尋找zui小延時。基本算法是在zui近的延時中檢測zui小的主機到從機的延時。為防止過量校正，也對時間校正進行了限制。這個方法基于它擁有的信息而在每個周期都進行校正。如果沒有收到真實的zui小延時消息報文，這將導致不適當的校正。
第二個時間校正機制是嘗試只使用延時來進行校正，前提是這些延時已經確定為真實zui小延時包，它有助于避免對時間值的無效校正。這個機制的基本想法是使用同步和延時請求來進行時間校正。對于同步消息，如果主機到從機延時小于zui小平均路徑延時，測量結果就顯示至少有一個主機到從機延時減去zui小平均路徑延時的時間偏差。
兩個方法都是通過調節一段時間內的精準時間協議的時鐘速率來進行時間校正。為了避免速率的大波動，每一個校正都限制幅值。這將有助于降低由于時間偏移的快速校正而引起的時間間隔誤差。在第二個機理中通過保持時間誤差值進行處理。當因接收到的同步或延時請求引起的新誤差被計算出來時，如果這個新誤差代表了一個更大的偏差，時間誤差就更新為新值。否則，時間誤差保持不變。基于時間誤差，只能進行有限的校正并從時間誤差中去除。因此，在完成校正之前，偏移測量可能進行多次校正。圖3為采用美國國半公司的DP83640芯片的解決方法。
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