ABB PPE091A101

 i-bus结构

1.系统最小的结构称为支线.最多可以有64个总线元件在同一支线.上运行。当支线连接的总线元件超过64个时或需选择不

同的结构时，则最多可以有15条支线通过线路耦合器(LC) 连接在一条主线上。下图所述结构称为域。每条支线最多可连

接64个总线元件,一-个域最多包含15条支线.故最多可以连接15*64个总线元件。安装总线可以按主干线的方式进行扩展,

干线耦合器(BC) 将其域连接到主干线上。总线上可以连接15个域,故可以连接超过14400个总线元件。

2.对于大型项目，建议在干线或主线.上采用IP网关,作为高速线路耦合器使用，可大大提高整个系统的通讯速度。支线采

用高速线路耦合器(10Mbit) 的系统结构如下，IG/S 的最大数量为225.故系统的容量仍为64 x 225=14400。

3.干线采用高速线路耦合器(10Mbit)的系统结构如下.其中IG/S的大数量为15,故系统的容量仍为64x 15x 15= 14400

-总线元件主要分为两大类: 传感器和驱动器。

-传感器负责探测建筑物中的开关的操作.或光线、温度、湿度等信号变化。

-驱动器负责在接收传感器传送的信号并执行相应的操作，如开/关、调节灯光的亮度、升降窗帘、启停风机盘管或地加热等。

-在同一条支线中.所有分支总线电缆总和不超过1000米.总线元件之间最远不超过700米,电源到总线元件最远不超过350米。

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