通过VB编个界面实现简单的PC机控制PLC的灯的关闭。-VB series interface through a simple PC-controlled PLC lights off.

用VB编程与三菱A系列PLC通信的源码,需要编写串口通讯工程的可以参考,(VB programming with Mitsubishi A series of PLC communication source code, the need to write serial communication engineering can refer to,)