西门子 300 plc 通过 MPI 通讯卡与组态王进行通讯时，能否实现双设备冗余的功能？
可以实现。
）一个 cp5611 卡可以连接两台 s7300plc（使用西门子厂家提供的可编程插头来实现）；
2）在组态王软件中建立两个 s7300plc，设备地址分别设备为 7.2 和 8.2（设备地址根据实际设备来设置），小数点前面的号指 plc 的地址，后面是 cpu 所在的槽号。这两个 plc 在 STEP7 编程软件中是单独定义的，所以除 plc 地址不一样，槽号是一样的；
3）在组态王中只须定义主设备的变量即可。
组态王和西门子 300、400PLC 通讯支持哪些通讯链路？是否需要西门子软件的支持？
1）MPI 电缆通讯方式：组态王所在的计算机必须安装 STEP7 编程软件；
2）MPI 通讯卡方式：组态王所在的计算机必须安装 STEP7 编程软件；
3）以太网通讯方式：不需要在组态王所在的计算机上安装 STEP7 或 Simatic net 通讯软件；
4）Profibus－DP通过方式：需要在本机上安装 STEP7 编程软件和 Simatic net 6.0(或以上版本)的通讯配置软件和授权；
5）Profibus－S7通过方式：需要在组态王所在的计算机上安装 STEP7 编程软件 ，但不需要安装SIMATIC NET 软件
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