毕业论文---基于plc的温室大棚控制.docVIP

2014届 　 分 类 号: TP 　　　　　　　　　　　　　　　　　 单位代码:10452 毕业论文（设计） 基于PLC的温室大棚控制 2014年04月09日 摘 要 温室已成为当今时代反季节作物培育的主要场所，随着科技的发展，温室技术已日臻成熟。同时，温室技术合理利用农业资源、保护生态环境、提高农产品产量及在国际市场竞争力的这一特性，深受广大反季节作物培育者的喜爱。如何能使温室实现全自动化控制，减少人力的参与，已成为温室技术的重要研究课题之一。随着过程控制技术、自动检测技术、通信技术的发展，将工业上较为成熟的、先进的控制方法和管理手段引入到农业的生产设施中，实施有效的温室环境控制，已成为现阶段温室技术的主要研究方向。 本文介绍了温室工作环境的控制原理，讨论了在温室控制中引入PLC技术构成分布式控制系统的方法,详细介绍了系统的特点、组成、硬件设计、实时动态监控系统及通信问题。分布式的控制结构,使各子系统相对独立,管理与控制功能分开,易于实现群控化管理,提高了系统的可靠性,且易于扩展。 关键词: 温室大棚;PLC;集散控制；智能控制 ABSTRACT Greenhouse has become the main place in today’s era anti-season crop cultivation. With the development of science and technology, the greenhouse becomes more and more mature. At the same time, greenhouse utilizing agricultural resources, protecting the environment, improving agricultural production and the characteristics of the competitiveness in the international market, was deeply loved by the majority of anti-season crop breeders. How to make the greenhouse fully automated control and reduce human involvement, has become an important research topic in greenhouse technology. With the development of the process control technology, automatic detection technology and the communication technology, advanced control methods and management tools introduced in the industry to agriculture production facilities, the implementation of effective control of the greenhouse environment, greenhouse technology has become a main research direction of present greenhouse technology. This paper introduces the control principle of greenhouse environment, discusses the introduction of PLC technology in the greenhouse control system of distributed control system, detailed introduces the system composition, characteristics, hardware design, real-time dynamic monitoring system and communication problems. Distributed control structure, make each subsystem are relatively independent and separate management and control function, easy to im