vb编写的简单的pid控制。纯vb编写，没有用其它任何控件，对界面编写和pid控制都会有帮助，谢谢。-vb prepared pid control simple. Vb net to prepare, did not use any other controls on the preparation and pid control interface will be helpful, thank you.

西门子plc自行编写上位机界面，使用snap7通讯。内置多个例程，含delphi，vb和vc