利用VB开发具有与PLC通信功能的ActiveX控件

ActiveX Controls With PLC Communication Function Developed by Using VB

主要介绍了利用VB开发的具有与PLC通信功能的ActiveX控件。对VB中ActiveX控件的功能和使用进行了阐述 ,对与PLC进行通信的帧格式以及如何用VB语言实现作了详细的讨论 。

The ActiveX controls offering communication function with PLC are introduced. The controls are developed by using VB language. The functions and operation of the ActiveX controls in VB are described. The frame format of communication with PLC and the implementation of using VB are discussed in detail. The program listings of certain parts are also given