PC和PLC通信程序设计

Design of PC and PLC Communication Program

介绍了PC和PLC的串行通信.下位PLC负责采集现场数据,实时控制,上位机利用高级语言组成友好的人机界面.工作时PC运行VB监控界面,管理PLC以及电机.PLC负责采集信息,控制以及接受电机信息,系统信息等.文中给出部分计算机和PLC通信的程序设计,并做了简单的运行演示.

Serial communications between PC and PLC are introduced in this paper. Inferior PLC is in charge of field data acquisition and real - time control, while superior computer displays a human - computer interface using higher - level language. When working, PC operates VB monitor interface, and manages PLC and the motor. PLC is used mainly to acquire information, to control and to accept message of the motor as well as the system. Part of the program design of PC and PLC communication is given. Finally, a simple running demonstration is made.