In the dredging process, to ensure the safety and the normal operation of the equipment is the basis for the success of the whole project. #2PLC collection of operating parameters of the engine room equipment, hydraulic system and mud pump system. Diesel engine lube oil pressure, oil temperature, cooling water level, water temperature limit alarm and diesel engine speed under the condition of parking protection and emergency shutdown protection. The limit of gear box lubrication oil pressure, oil temperature alarm and emergency off pump protection. Hydraulic system