The method to PLC and PC serial communication is introduced and connection is established in the system of dynamic inspecting unit state, the serial communication program is designed in the environment of WINDOWS and VB.

• 阐述了一种在水电厂机组监控系统中PLC与PC串行通信的实现方法；给出了PLC与PC的硬件接口方法及基于Windows和VB环境下的通信程序.