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MVME172-263260

通过（PLC网络的拓扑结构）典型PLC网络的介绍，可以看出PLC网络各级子网通信协议配置的规律如下：

1）PLC网络通常采用3级或4级子网构成的复合型拓扑结构，各级子网中配置不同的通信协议，以适应不同的通信要求。

2）在PLC网络中配置的通信协议分两类：一类是通用协议，一类是公司专用协议。

3）在PLC网络的高层子网中配置的通用协议主要有两种，一种是MAP规约（全MAP3．0），一种是Ethernet协议，这反映PLC网络标准化与通用化的趋势。PLC网的互联，PLC网与其它局域网的互联将通过高层进行。

4）在PLC网络的低层子网及中间层子网采用公司专用协议。其最底层由于传递过程数据及控制命令，这种信息很短，对实时性要求又较高，常采用周期I/O方式通信；中间层负责传送监控信息，信息长度居于过程数据及管理信息之间，对实时性要求也比较高，其通信协议常用令牌方式控制通信，也有采用主从方式控制通信的。

5）PC加入不同级别的子网，必须按所连入的子网配置通信模板，并按该级子网

配置的通信协议编制用户程序，一般在PLC中不需编制程序。对于协议比较复杂的干网，可购置厂家供应的通信软件装入PC中，将使用户通信程序编制变得比较简单方便。

6）PLC网络低层子网对实时性要求较高，其采用的协议大多为塌缩结构，只有物理层、链路层及应用层；而高层子网传送管理信息，与普通网络性质接近，又要考虑异种网互联，因此高层子网的通信协议大多为7层。

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MVME172-263260

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