AA6VM80EP2

发布时间:2017-02-09

AA6VM80EP2

AA6VM80EP2

AA6VM80EP2

  2.3 人机界面与PLC之间的通讯 
    西门子人机界面与PLC之间的通讯方式有3种:PPI(点到点)通讯方式,MPI(多点)通讯方式和PROFIBUSDP通讯方式。该温控系统中采用MPI(多点)通讯方式。 
    S7-300 PLC上有一标准化的MPI接口,它既是编程接口,又是数据通讯接口,使用S7协议(主要用于较近距离的数据通讯)。由于MPI接口是RS485结构,PLC与人机界面之间通过RS485线相连,其传输速率为187.5k波特率。一个MPI网可以有多个网络节点,其地址是在S7-300硬件组态中设置的。该系统中人机界面的MPI地址为“1”;CPU的MPI地址为“2”。 

    人机界面与过程之间通过PLC利用变量进行通讯。通常在PLC和操作单元之间交换的数据为过程数据。为此在组态中创建指向PLC上某个地址的变量。触摸屏从的地址中读取该数值并显示它。同样的,操作员可以在触摸屏上输入将被写入PLC上某个地址的数据。 

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AA6VM80EP2


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