BMXDDO1602H
浮動主站通信方式又稱N：M通信方式，適用于總線結構的PLC網絡，是指在總線上有M個站，其中N（N＜M）為主站，其余為從站。
N：M通信方式采用令牌總線與主從總線相結合的存取控制技術。 首先把N個主站組成邏輯環(huán)，通過令牌在邏輯環(huán)中依次流動，在N個主站之間分配總線使用權，這就是浮動主站的含義。 獲得總線使用權的主站再按照主從方式來確定在自己的令牌持有時間內與哪些站通信。
一般在主站中配置有一張輪詢表，可按輪詢表上排列的其它主站號及從站號進行輪詢。 獲得令牌的主站對于用戶隨機提出的通信任務可按優(yōu)先級安排在輪詢之前或之后進行。
獲得總線使用權的主站可以采用多種數據傳送方式與目的站通信，其中以無應答無連接方式速度最快。
CSMA/CD通信方式是一種隨機通信方式，適用于總線結構的PLC網絡，總線上各站地位平等，沒有主從之分，采用CSMA/CD存取控制方式，即“先聽后講，邊講邊聽”。
CSMA/CD存取控制方式不能保證在一定時間周期內，PLC網絡上每個站都可獲得總線使用權，因此這是一種不能保證實時性的存取控制方式。 但是它采用隨機方式，方法簡單，而且見縫插針，只要總線空閑就搶著上網，通信資源利用率高，因而在PLC網絡中CSMA/CD通信法適用于上層生產管理子網。
CSMA/CD通信方式的數據傳送方式可以選用有連接、無連接、有應答、無應答及廣播通信中的每一種，可按對通信速度及可靠性的要求進行選擇。
以上是PLC網絡中常用的通信方式，此外還有少量的PLC網絡采用其它通信方式，如令牌環(huán)的通信方式等。 另外，在一些PLC網絡中，常常把多種通信方式集成配置在某一級子網上，這都是今后技術發(fā)展的趨勢。
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