vb多线程和西门子PLC通讯程序,用于工业控制系统的监控软件开发.-vb multi-threaded and Siemens PLC communication procedures, control systems for industrial monitoring and control software development.

开发S7-300/400与第三方软件串口通讯软件！对自行开发上位机工控软件者是非常难得的好资料！网上很难找的！万勿错过！-Development S7-300/400 with third-party software serial communication software! Pairs of self-developed Host Computer Control Software It is very rare good inf

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 pro