西门子PLC的通信协议主要是PPI、MPI、Profibus、CP243CP343CP443 网络协议，prodave是早期完成的程序接口，除了网络协议外其它的主要协议都支持-Siemens PLC' s communication protocol is mainly PPI, MPI, Profibus, CP243CP343CP443 network protocols, prodave early complete programming interface, in additio

用MPI连接Simatic net OPC Server 和PLC的说明文档-Connect the SimaticNET OPC Server and PLC with MPI

OPC的高级语言实现上位与下位的程序连接及通信，介绍OPC应用程序深入剖析及相关PLC和高级语言编程。-The high-level language OPC to achieve the upper and lower program connection and communication, the introduction of deep analysis of OPC applications and related PLC and advanced language programmi

OPC方式实现PC机与西门子PLC通讯,编程的可以参考一下，很好用啊-OPC way to achieve communication between PC and Siemens PLC