计算机与PLC控制系统通信的设计与实现

可编程控制器在分布式控制中作为下位机得到越来越广泛的应用 ,PLC与计算机之间的通信是进行Windows程序设计的关键技术之一。阐述了一种用FX2N系列PLC构成的分布式控制系统 ,详细分析了系统的通信协议 ,并给出了通信程序的实现方法。

The Design and Implement of Communication between PLC and Computer in its Controlling System

Programmable logic controller (PLC) is used more and more widely as a foreside computer in the control. The achievement of the communication between PLC and computer is one of the key techniques that make Windows program design. This paper intends to expound a distributed control system used the serial FX 2N , composed by PLC, analyze in details the communication protocol of the system, and give the fulfillment way of the communication program.