Control Module Design And Networked Process Control Experiment Platform

With the progress of science and technology, observation and control system hasdeveloped in the intelligent and networked direction. In order to introduce the latesttechnological achievement into university's course teaching, an intelligent observationand control module with the function of data collecting,processing,communication,and control has been designed in this subject. Based on the desinged module, a networkedprocess control experimental platform has been constructed.The paper fristly introduces the hardware design of the module.In this part,theinteraction circuit between human and machine,data collecting circuit, communicationinterface circurt,and power circuit have beed analysed in detail.The master controller forthe module is MSP430F149 single chip which is produced by Ti Company in America.After finishing the hardware design of the observation and control module,I havedeveloped the control program for the module using the software of IAR EmbeddedWorkbench 3.41.A.The software design adopts modularization design idea which makethe software development more efficient.After the module has been designed successfully,a suit of networked process controlexperimental platform has been constructed.The water level of the tank is the controlledtarget in the system. In the course of structuring the plafform,a protocol for thecommunication based on RS485 bus has been established.And then introduce somemethod to raise the RS485 network's dependability of communication and write theprogram with the function of serial data commnication,data storage and real time curvedrawing for the PC utilizing VC++6.0.After that, the paper analyses the controlarithmetic for the process control system.In the end, the system has been debugged. It is proved that the module's design issuccessful,the module's performance is reliable,and the platform constructed can meetthe need of integrated,opened and networked experiment.