Affiliation:
1. University of Science and Technology Liaoning,Anshan
2. Jimei University
Abstract
In order to control heat treating furnace temperature and transfer real time data, an embedded control system has been built. The system’s hardware was mainly made up of microcontroller, analog, digital and RS485 interfaces. It has the ability of exchanging data with an industrial PC via SCADA Modbus network. According to the features of control process and the hardware’s performance, the system’s software was divided into Modbus task, control task, I/O scan task, panel task, and alarm task. The RTX51 Tiny was used as software kernel. By running in cooperative multitasking manner, the five tasks handle various functions of the system. Each of the five tasks is introduced. The task scheduling is explained. It is shown that the system can meet the requirements of process control and data acquisition. With the advantages of multitasking structure, simple hardware frame, reliable network communication and low cost, the design method we mentioned is valuable for developing embedded control systems.
Publisher
Trans Tech Publications, Ltd.
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