西门子 PRODAVE 使用手册 可用于VB VC 与PLC通讯-Siemens PRODAVE user manual can be used for PLC communication with VB VC

利用第三方软件（如VB）开发S7-300PLC与上位机进行MPI通讯的源码实例！非常珍贵！-The use of third-party software (such as VB) development of S7-300PLC to MPI communication with the host computer source code examples! Very precious!