嵌入式系统在传统PLC 控制系统中的应用

介绍了以AT90mega8515 嵌入式单片机构成的单总线温湿度采集系统在PLC 控制网络中的应用，以及通过OMRON 公司PLC 构建的Host Link 控制系统，实现对下层PLC 的监控。系统的高性能上位机同时为嵌入式系统提供了应用接口。运用C++Builder6.0 编制可视化监控软件并通过多线程技术提高系统响应速度。
关键词 PLC 嵌入式系统 RS422A 1-wire 多线程

The application of embedded system in traditional PLC control system CHENG Kang, CHEN Jia-pin, LI Zhen-bo (Key Laboratory for Thin Film and Microfabrication Technology of Ministry of Education, Shanghai Jiaotong University, Shanghai 200030, P.R, China) Abstract It is introduced how the 1-wire data collection system based on embedded MCU(AT90mega8515) to be used in the traditional PLC control system. The Host Link control net constructed with OMRON PLC complete monitoring the substrate PLC. In the mean time, the high-powered upper PC support the application of the embedded system. The visible monitoring software is organized with C++Builder6.0, and the response speed is improved by the technique of multithread.
Key words : PLC; embedded system; RS422A; 1-wire; multithread