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.

Modbus 通讯协议VB编程 通讯协议VB编程-Modbus

OPC通讯组件，自动行业编程应用必备, 支持最新的OPC标准-OPC communication components, auto industry application programming necessary