主要讲些plc编程，指令 实例等，还有接线图，安装等-Mainly about plc programming, instructions and examples, as well as wiring diagrams, installation

VB编写语言通过OPC连接西门子的PLC，并且将相关的数据填写到SQL的数据库中-VB language written in connection with the Siemens PLC via OPC, and will fill in the relevant data into SQL