vb2007 与 PLC通讯的测试编程,采用vb语法结合梯形图编程的结构编写的，希望能给大家有少少帮助。-vb2007 test communication with the PLC programming, the vb syntax combined with the structure of the ladder programming prepared, I hope we can have some help.

一个C#.NET环境下编写的PLC工业控制通信程序,socket，TCP协议编程,本程序对.NET开发者非常有用-NET environment to write the PLC Industrial Control Communication Program the socket, the TCP protocol programming Program very useful. NET developers

西门子300PLC SCL编程手册，类似C语言的PLC程序设计编程方便逻辑性强(Siemens 300PLC SCL programming manual, which is similar to c-language PLC programming programming is convenient and logical)