A02B-0236-C205 近年來，無線網絡成為工控領域中迅速發展的熱點之一，也是工業自動化產品未來的新增長點。顯而易見，在配置、安裝、修改和擴展等方面，無線網絡的成本都低于有線網絡。特別是通過無線網絡可以很方便地接入移動設備，例如在物流過程中的裝載和運輸如若采用無線網絡，將大大提高工作人員的工作效率和精確性。
實際上，作為一類針對某些特定應用、采用專用通信協議的無線傳輸方案早已投用，也起到良好效果。而當前發展的目標是追求無線傳輸在工控領域的普遍應用或成規模應用必須解決的主要問題，即傳輸的確定性、可互操作性、網絡安全和網絡投用的適應性等，而決非個別的解決方案。因此，發展的方向首先是通信協議的標準化。對于可用于現場設備層的無線短程網，采用的主流協議是才問世兩三年的IEEE 802.15.4/ZigBee；而對于適應較大傳輸覆蓋面和較大信息傳輸量的無線局域網，采用的主流通信協議則是IEEE 802.11系列。
無線介質不像有線介質那樣處在一種受保護的傳輸環境之下。在傳輸過程中，它常常會衰變、中斷和發生各種各樣的缺陷，諸如頻散，多徑時延，干擾，與頻率有關的衰減、節點休眠、節點隱蔽和與安全有關的問題等等。不過這些影響無線傳輸質量的因素，都可以通過在ISO通信7層模型的各層中采用適當的機制加以克服或減輕。要注意的是，并不是所有的機制都可以與其他的機制相兼容；或者說，有可能對關鍵性能和屬性產生負面影響。因此，通信系統必須根據其具體的應用現實環境，對各層所采用的機制進行組合優化，以求得的綜合通信性能。
在解決了可靠、保密、克服干擾等問題后，又開發了支持這些無線通信協議的物理層和MAC層的收發器芯片，成本也進一步下降。加之近些年來要求設備（包括移動設備）的無線連接的呼聲日趨強烈，這也使得無線系統的增長呈指數增長，預示無線通信也實質性地進入工業控制領域。
A02B-0236-C205
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