The Controlling And Monitoring System For Ship Power Station Based On PLC

With the development of industry and agriculture.The requirement for reliable running of power equipment is more and more necessary.Therefore,in the areas where high realiablility and safety are required,controlling,monitoring,and follow-up managing power equipment are more and more important,the same with ship power station.In order to realize the realible control and safe operation and maintenance of ship power station,and enhance the automation degree of un manned engine room,the thesis has designed a novel distributed ship power automation system(network monitoring and management system) which can increase the reliability and economic effect,using advanced industrial control technology,computer technology and network programming technology.The automation is composed of two operating station computers (one is a backup computer) and three slave computers.Every slave computer,which is cored by omron C200 PLC ,controls a generator independently.Slave computers have data detection and control function with the help of the data detection and control interfaces which are composed of all kinds of position swiches,sensors and execution units. Master computer (operation station computer) is industrial PC with Windows2000 as operating system.Useing graphical user interface,Visual Basic technology and MS ACCESS data base system,master computer has data capture and displaying,data recording and data enquiring functions.Slave computer (measurement and control unit) and master computer (monitoring and management unit) are connected by serial communication for data exchanging. In addition,the automation system can work with together with other systems in the ship.The completed automation system not only can perform the starting,connecting,frequency and load modulating,disconnecting and stopping functions automatically but also can perform the monitoring,alarming,automatic recording,and performance evaluating functions,etc.The system adopts redundancy technique and error proofmeasure:communicating process uses a self-adapting protocol and CRC;master computer software can avoid human-initiated-failure,check data border,limit authority ,backup system data and start backup computer by software etc.To some extent,these ways help to increase the reliability of the system.