The Design Of Modularized Control System Based On Embedded Technology

Data acquisition and control is an important branch of information science field. develop as yet has become a specialized technology,widely used in the industrial field. The emergence and development of fieldbus enhanced communication capability of data acquisition and control system,making relation among equipment more and more closer.Ethernet,which based on TCP/IP protocol,with long distance transmission power and convenient features,has develop to the data acquisition and control filed. Control equipment join up ethernet,becoming a trend,can greatly enhance its geographical distribution ability.Traditional acquisition and control system usually designed for particular scene of control,with low adaptability.When new control demand comes up,the system need to re-design,wasting time and labor.In response to this demand,PLC,DCS and other control equipments come up,they are modular design,powerful,flexible and stable, and can meet the control demand very well.However,these equipments are often designed by foreign manufacturers,technological security at the same time.These products occupy a high rate of domestic industrial control market,which is unacceptable for us.In recent years,embedded systems technology and high performance ARM micro-processor are developing very fast,these provides a material base for us to design a powerful and flexible control system.The main task of this paper is committed to design a modular control system based on embedded technology.The system structure is master-slave style.Acquisition and control modules use AT89S52 as core,main controller uses S3C2410 as core.The control modules in charge of collecting the underlying data and outputing control result,the main controller responsible for data processing and computing,with many function modules inside.Users can achieve control capability by write configuration file call these modules,flexible and at liberty.The system,which we designed,use CAN bus and ethemet as internal and external commtmieation mode.Acquisition control modules and main controller communicate by CAN bus.At the same time,the main controller has network interface,users can remotely download or modify the configuration file, meet their control demand.In this paper,we give a brief introduction to the relative technology first,followed by the overall design of the system hardware and software solutions and selection,and then introduced hardware design of control modules and main controller.And then we give an explicit statement about the software design,including control modules and main controller.Finally we summarized the overall design course and illuminate the problem we meet in design process.