The Study, Based On Plc Technology, Ship Auxiliary Machinery Automatic Control System

Along with reforming and opening to the outside world deeply and joining the WTO, the measures of inside and outside trade are increasing greatly in our country, as the result of the ships as main conveyance tool of the outside trade goods are developed quickly, the large size and automation of the ships is more and more needed by market. The automatic control system of ship's auxiliary mechanism as the important part of ship automation also acquires the new vitality because of adoption the high new technique.The research work of this paper is divided into seven parts: The first ,according to the work characteristics of ship's auxiliary boiler, this paper is to design applied project in the automatic control system of ship's auxiliary boiler; The second, according to the work request of the cargo winch of alternating three - speed change - pole speed - adjusting, this paper is to determine adopting the method of the PLC control; The third, this paper is to inquire PLC applied method in marine purifier control system; The fourth, this paper is to design PLC application in three -phase induction motor control, to give the ladder chart, program and input and output circuit diagram; The fifth, this paper is to research the method of the ship's combined starting screen automatic control with the PLC; The sixth, this paper is to inquire the possibility of apply the PLC in ship's engine room surveillance system; The seventh, according to the comprehensive analysis of above actual example of ship's auxiliary mechanism automatic system with the technique of PLC, not only can use the technique of PLC to replace traditional relay - contactor control technique in ship's auxiliary mechanism automatic system, but also can get the conclusion of the former is more dependable and more clever than the latter, the maintenance is more convenient, thus develop a new path for ship automation.