浮動(dòng)主站通信方式又稱N：M通信方式，適用于總線結(jié)構(gòu)的PLC網(wǎng)絡(luò)，是指在總線上有M個(gè)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(jié)合的存取控制技術(shù)。 首先把N個(gè)主站組成邏輯環(huán)，通過(guò)令牌在邏輯環(huán)中依次流動(dòng)，在N個(gè)主站之間分配總線使用權(quán)，這就是浮動(dòng)主站的含義。 獲得總線使用權(quán)的主站再按照主從方式來(lái)確定在自己的令牌持有時(shí)間內(nèi)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(hào)及從站號(hào)進(jìn)行輪詢。 獲得令牌的主站對(duì)于用戶隨機(jī)提出的通信任務(wù)可按優(yōu)先級(jí)安排在輪詢之前或之后進(jìn)行。
獲得總線使用權(quán)的主站可以采用多種數(shù)據(jù)傳送方式與目的站通信，其中以無(wú)應(yīng)答無(wú)連接方式速度最快。
CSMA/CD通信方式是一種隨機(jī)通信方式，適用于總線結(jié)構(gòu)的PLC網(wǎng)絡(luò)，總線上各站地位平等，沒(méi)有主從之分，采用CSMA/CD存取控制方式，即“先聽(tīng)后講，邊講邊聽(tīng)”。
CSMA/CD存取控制方式不能保證在一定時(shí)間周期內(nèi)，PLC網(wǎng)絡(luò)上每個(gè)站都可獲得總線使用權(quán)，因此這是一種不能保證實(shí)時(shí)性的存取控制方式。 但是它采用隨機(jī)方式，方法簡(jiǎn)單，而且見(jiàn)縫插針，只要總線空閑就搶著上網(wǎng)，通信資源利用率高，因而在PLC網(wǎng)絡(luò)中CSMA/CD通信法適用于上層生產(chǎn)管理子網(wǎng)。
CSMA/CD通信方式的數(shù)據(jù)傳送方式可以選用有連接、無(wú)連接、有應(yīng)答、無(wú)應(yīng)答及廣播通信中的每一種，可按對(duì)通信速度及可靠性的要求進(jìn)行選擇。
以上是PLC網(wǎng)絡(luò)中常用的通信方式，此外還有少量的PLC網(wǎng)絡(luò)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(wǎng)絡(luò)中，常常把多種通信方式集成配置在某一級(jí)子網(wǎng)上，這都是今后技術(shù)發(fā)展的趨勢(shì)。
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