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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