Abstract: The marine controlled atmosphere storage can lengthen the storage life of fruits and vegetables by controlling and altering the temperature, humidity and gas components, such as oxygen concentration, carbon dioxide concentration and ethylene concentration, in the storage environment of fruits and vegetables. For the traditional integrated control method, the fruit and vegetable storage units and the equipment units were often arranged separately in different cabins due to the limited cabin layout space. This would lead to problems, such as a large number of cables, complicated wiring harnesses, long signal transmission distances, low accuracy of the collected data, and the poor electromagnetic compatibility.A distributed control system of marine controlled atmosphere storage equipment based on the PROFINET communication has been adopted in order to solve the above problems. This control system has the advantages of the large amount of communication data, long distance, good real-time performance andextensibility, which can greatly improve the reliability of the marine controlled atmosphere storage equipment. At present, it has been promoted and applied in many ship types, with the stable operation and the good preservation effect.

Key words: controlled atmosphere storage, programmble logic controller (PLC), PROFINET, distributed, control system

摘要： 船用气调保鲜装置是通过对果蔬贮藏环境中温度、湿度和气体成分如氧气浓度、二氧化碳浓度和乙烯浓度等进行控制调节,延长果蔬贮藏期。以往采用集成式控制方式,但由于船舱布局空间有限,果蔬贮藏单元和设备单元往往分开布置在不同舱室,导致电缆敷设数量多、线束繁杂、信号传输距离远、采集数据准确度不高、电磁兼容性差等问题。为解决上述问题,采用基于PROFINET通信的船用气调保鲜装置分布式控制系统,该控制系统具有通信数据量大、距离长、实时性好及可扩展等特点,可极大提高船用气调保鲜装置的可靠性。目前已在多个船型推广应用,装置运行稳定,保鲜效果好。

关键词: 气调保鲜, 可编程逻辑控制器, PROFINET, 分布式, 控制系统