FBM20/21 240VAC FBM20/21 240VAC ，FBM20/21 240VAC
西門子PLC的兩種網絡連接器介紹
利用西門子提供的兩種網絡連接器可以把多個設備很容易的連到網絡中。兩種連接器都有兩組螺釘端子，可以連接網絡的輸入和輸出。一種連接器僅提供連接到CPU的接口，而另一種連接器增加了一個編程接口。兩種網絡連接器還有網絡偏置和終端偏置的選擇開關，該開關在ON位置時的內部接線圖，在OFF位置時未接終端電阻。接在網絡端部的連接器上的開關應放在ON位置。如下圖所示：
圖1網絡連接器
帶有編程器接口的連接器可以把SIMATIC編程器或操作員面板接到網絡中，而不用改動現有的網絡連接。編程器接口的連接器把CPU來的信號傳到編程器接口。
在其通訊模式中還有自由端口通訊、工業以太網通訊、調制解調器通訊、無線以太網通訊，
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