Since the 1990s, the computer has developed unceasingly has initiated each domain revolutionary transformation. The shipping interest also receives its influence, causes the modern shipping is also getting higher and higher to the ships automaticity and the information integration degree request. In order to adapt the modern automation engine room request, the PLC control substitutes gradually following the electrical pick-off control into ships engine room control key link, causes the control system to be safer, to be rapid, is reliable. The ships in the normal navigation process, the engine room present the breakdown to need the marine engineer to get down frequently to the main engine, equipment and so on auxiliary engine to carry on the service and the maintenance, what because the present majority ships use is the unmanned engine room pattern, therefore are very few in engine room work's quantity. Therefore works as the marine engineer enters the engine room work to need to have the reliable monitor alarm system, the traditional black-white control marine engineer safety alarm apparatus, although can provide the warning, but it easy to break down and was realized not easily. However uses PLC to control this to be able to cause the marine engineer alarm system's safety coefficient big enhancement, thus causes marine engineer's work to be safer reliably. The above design has satisfied "2006 Steel Sea boats Construct Into Level Standard" rapidly, real-time, reliable, direct-viewing and so on requests. Therefore controls the marine engineer alarm apparatus with PLC to be able to enable the marine engineer to have the big enhancement in the engine room job site safety coefficient
Keywords Engineers to monitor the ship security alarm system control PLC relay