The Research Of A PLC Monitor

PLC,robot and CAD/CAM are called the three major pillars in the modem factory automation.PLC,As the head of the three,has become the leading basic automatic equipment in the field of the industry control in the early 1980s' But as a matter of fact,PLC being with the lack of friendly man machine interface,rnakes no close relationship between human and machineometimes it even can not be promoted and applied in some fields Aiming at the situation mat those imported products are too expensive while domestic products are of rare famous brands,A PLC man-machine interface-PLC MONITOR is developedThis paper systemically introduces the developing procedure for the whole system,including how to design hardware and software system.especially emphasizing PLC communication protocol.real time message accessing,LCD controller instruction set,definition of data construction for message & tag screens and how to display thern,assignment of internal resource of CPUealization in software among PLC&manitor,file format defining and download of user data,etcPLC MONITOR will compensate some weakpoints of PLC,and extend the application rangeimultanneously enhance the performance of PLC and increase the attached value of mechanical machines,undoubtedly it will see hight market prospect...