PLC与3C控制器之间的通信设计

Communication Program Design between PLC and 3C Controller

不同控制系统间的通信设计一直是现场仪表工程师研究的主要课题,介绍了通信程序设计和现场应用的实例,即2台控制器,1台是PLC;1台是3C防喘振控制器,控制器之间通过RS-232C串行接口,采用Modbus通讯协议进行数据交换,最终实现主机共享从机数据。

It is always a subject for discussion for instrument field engineer that the design of communication program design between different control systems.This dissertation is as an example applicable to field.There are two controllers:PLC and 3C antisurge controller.Data exchanges by RS-232C serial port and Modbus communication protocol.In the end master shares slave data.