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A03B-0807-C051 

采取這樣的技術路線，不但可將無線通信應用于有線通信布線困難的場合，還可在一定程度上替代有線通信，以期在節省安裝成本和運行成本方面收到可觀效果，還可提高檢測系統和控制系統配置的靈活性。

概述性的結論

（1）無線傳輸進入工業控制領域的趨勢無可置疑。有人估計再過四五年，即2010年前，大多數儀表和自動化產品都將嵌入無線傳輸的功能。由于無線現場儀表的優點一定要體現在用電池長期供電上，所以一般來說無線傳輸不適用于高速控制的場合。但是實踐證明對大多數監控和慢速控制場合，它足夠可靠；也就是說可以用在將近80%的自動化和過程控制場合。

（2）無線技術首先會用在樓宇自動化、自動抄表、事故響應、設備監控SCADA系統、設備資產管理、診斷維護等。當前較適宜應用的行業可能有：物流過程（裝運狀態監控）、汽車制造、食品加工、制藥和流程行業（設備資產跟蹤、監控、管理）等。

（3）用于工業控制的無線技術主要集中在無線局域網和無線短程網兩個方向。它們都具有相當牢固和成熟的技術基礎，但為了適應工業控制要求和環境，還需要專門的開發研究。

（4）現有現場總線的無線傳輸的可行性正在評估。基于CAN的DeviceNet實現無線通信的確定性相對要容易，因為其數據包長度相當小。現已有產品問世，但尚未見正式規范。因此只能認為這僅僅是個別的解決方案。相對而言，Profibus-DP的數據包長度相當長（187KB），若要實現無線通信，只能通過IEEE 802.11（其帶寬為1Mb/s）、IEEE 802.11b（其帶寬為11Mb/s）或 IEEE 802.15.1（其帶寬為1～3Mb/s）而不能采用IEEE 802.15.4（其帶寬僅為20～250Kb/s），因而要保證傳輸的確定性確有其難度。

（5）HART會已成立無線HART工作組，要求2006年初拿出規范草案，確定通過ZigBee實現HART的可行性。鑒于采用HART協議傳輸的儀表市場占有率高，絕對數量巨大，此動向極為吸引業界關注。

（6）適應各種不同應用類型和要求的無線通信的標準，有的已經頒布并被市場接受，有的還在制訂過程中，其發展和市場開發值得我們重視。

（7）應該把無線通信看成是現有有線通信系統的一種發展和重要補充，決非一種替代。

A03B-0807-C051 
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A03B-0807-C051