基于PLC、变频、电子膨胀阀、触摸屏的小型冷库微电脑控制系统的研究  

A Small Refrigeratory of the Microcomputerized Control System based on PLC,Inverter,Electronic Expansion Valves,Touch Screen

作　　者：张洪臣[1] 任益夫[1] 李凤丽[1] 王彦[1] 

机构地区：[1]河北农业大学海洋学院,河北秦皇岛066003

出　　处：《廊坊师范学院学报（自然科学版）》2010年第5期77-80,共4页Journal of Langfang Normal University(Natural Science Edition)

基　　金：河北省科学技术研究与发展指导计划项目(062135128)

摘　　要：基于采用变频压缩机和电子膨胀阀的小型冷库系统结构和控制要求,介绍了一个分布式控制系统的设计。硬件主要基于西门子SIMATIC S7-200CN系列可编程逻辑控制器,通过蒸发器的过热度来控制电子膨胀阀的开度和压缩机的运行频率,同时引入人机界面友好的西门子SIMATIC TD400C触摸屏作为现场监控及数据采集平台;测试结果表明设计的控制系统不仅运行稳定可靠,而且控制精度高;通过MPI(Multi-Point Interface)协议,触摸屏能准确无误地与PLC通信,实时监视和控制小型冷库工作状态。Based on the use of inverter compressors and electronic expansion valve of the small-scale cold storage system architecture and control requirements,a distributed control system design was introduced.The hardware environment was mainly based on Siemens SIMATIC S7-200CN series of PLC,Through the evaporator superheat to control the electronic expansion valve opening and compressor operating frequency,and a friendly Siemens SIMATIC TD400C touching screen was also applied as the local platforms of SCADA（SupervisoryControl and DataAcquisition）;Tests results show that the PLC based control system isnot only capable of running stably and reliably,but also has higher control accuracy.The touching screen can communicate precisely with PLC,viaMPI（Multi-Point In-terface）protocol.,Touch screen can be accurate with the PLC communications,real-time monitoring and control of small refrigeratory working condition.

关 键 词：小型冷库微电脑控制 模糊-PI PLC 触摸屏 电子膨胀阀 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]