S7 300 MPI 电缆方式是否支持通过 GPRS 和组态王通讯？
不支持。
组态王的 GPRS 通讯方式要求必须创建虚拟串口并通过此串口进行数据通讯。而对于 MPI 协议，我们的 MPI 驱动是通过调用西门子 PLC 的动态连接库（s7onlinx.dll等）实现和 PLC 进行通讯的,并不是直接通过串口实现数据通讯。
其他类似调用方法的驱动，同样也不支持 GPRS 连接。
组态王和多台西门子S7-300、400 PLC 通过 DP 协议通讯时，设备地址应如何定义？
1）硬件连接：计算机中插入一块CP5611（或CP5613)可实现将多个S7-300/400PLC连接在一条 DP 总线上。
2）DP 协议设置：所有 PLC 必须设置的 DP Slave 站， CP5611(或 CP5613)要求通过 Simatic net 设置的 DP * master 站；
3）组态王中设备地址定义：选择 PLC/西门子/S7-200 系列(DP)/Profibus-DP ，设备地址固定为 1.1 (该地址与
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