描述
为了增加控制器的I/O点数和增加控制器到现场的距离,可以把现场总线和控制器连接,如lonworks总线,这时控制器内应该有连接lonworks时的功能块。Lonworks总线上的模块有独立的输入输出板和运算板,在运算板中还有少量的功能块。
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