Flowmeter calibrator system based on PLC
Peng Wan · Modern Machinery · 2008
Programmable Logic Controller(PLC) was a kind of electronic device to realize digital operation designed for application in industrial conditions.For recent years,it developed rapidly,and had widely applied prospect.Based on the background of alteration to a large flowmeter calibrator in a certain factory,the design and realization of PLC control system were introduced.Because this flowmeter calibrator was imported early,its working process quite depended on the operator under the technical conditions at that time.So the efficiency was reduced badly,and this situation was not adapted to the trend of the development of modern measurement and control instruments.In these days,automation developed rapidly,and the disadvantages became obvious more and more.Therefore applying automation technology in the alteration could reduce the labor intension largely and improve the automation of instruments.The working principle of a certain flowmeter calibrator and the alteration to its working flow using PLC were introduced.The software and hardware design of the PLC control system were expatiated.The distribution of the PLC I/O and part of control ladder graph were given.