cj1_基于PLC的温室温度控制系统设计.docVIP

PAGE PAGE 2 摘 要 本设计是基于西门子可编程逻辑控制器S7-200的温室温度控制系统，它实现了对某兽医研究所多个温室的温度控制。具体方法是：可编程控制器通过每个温室中的温度变送器来采集温度，通过与实际要求的设定值作比较来控制每个温室中的加热器的运行状态。 本设计对象共分二个控制区，其中，二区和四区为控制1区，三区和冷库为控制2区。其中，控制的方式又分为手动控制和自动控制。并实现故障报警和温度设定值的独立设定。 在温室温度控制系统的硬件设计中，给出了主电路的设计方案和主电路的线路图，进行了控制1区和控制2区的选型计算，并且给出了控制回路的设计以及线路图。 在温室温度控制系统的软件设计中，上位机是基于组态软件MCGS来实现人机界面的设计，既直观又方便地实现了操作窗口的制作和变量的连接。下位机则通过程序设计实现了温度控制的自动控制功能。 本设计由于采用工控组态软件和可编程序控制器PLC作为控制核心，使温室控制系统具有界面友好、易于操作、运行可靠、便于更改、扩充、升级等优点。经现场测试证明性价比高、运行可靠，具有很强的应用性。 关键词：温室控制；组态软件；PLC控制 Abstract This system is a greenhouse automatic control project controlled on the basis of SIEMENS S7-200 PLC. It realizes the temperature control for every greenhouse since having powerful function. Specific method is that: may programming controller changes through the temperature in every greenhouse send ware gathered temperature, by asking with reality set temperature make a comparison for every greenhouse in the operating condition of heater. In which, the objects of design are two control areas.No.2 and No.4 are the first control area; No.3 and refrigeratory are the second control area. The control mode classified as the automatic control and control of by hand. And implement malfunction alarm and enactment of the TEMP SV alone. In the design of hardware software of the regulation the greenhouse temperature,there are the design proposal and the circuit diagram of the main circuit. To calculate lectotype of the first control area and the second control area and provide the design proposal and main circuit of duct pilot. In the design of hardware software of the regulation the greenhouse temperature, up position has adopted group form software MCGS to complete the design of man-machine interface,It is convenient and directviewing to make the Operation Windows and to attach the variable Machine-under through the design process to achieve a temperature-controlled automatic control functions.  As a result of industrial design of the configuration software and PLC contr