ABB模擬量模塊di802
電梯是一個復雜的係統。移動轎廂和機房控制器之間的主要通信鏈路是通過移動電纜實現。基於樓宇高度,該電纜長度可到達10到500 米或更長範圍。鑒於其低速要求和所需的電纜距離,控制器局域網(CAN)和LonWorks是電梯係統常用的協議。
考慮到電纜在運行期間所承受的壓力,電纜在數年內保持可靠性是非常重要的。電梯上下移動時,電纜需彎曲,這對於光纖布線而言並不合適,因此大多數電梯電纜均由銅制成。考慮到電纜長度,標準以太網不適用,因為它不能超過100米。
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