用Delphi编程实现计算机与PLC的串行通信

Implementation of Serial Communication between Computer and PLC with Delphi Programming

PLC被越来越多地应用于工业控制，如何通过计算机串口编程实现计算机与PLC通信，从而达到远程监控和工业自动控制的目的显得尤为重要。本文简要地叙述了PLC的工作原理及如何用Delphi高级语言编程实现计算机与PLC的串口通信。

PLC has been enjoyed a wider and wider application in industrial control. And then, it appears extremely important how to realize the communication between computer and PLC by programming serial communication interface to achieve the remote monitoring and industrial automatic control. The paper describes in brief the working principles of PLC and how to realize serial between computer and PLC with the programming of Delphi high-level language.