基于PLC的大棚温室控制系统的设计

第I页基于PLC的温室控制系统的设计摘要随着人们生活水平的提高，由温室大棚种植的反季节蔬菜成为人们越来越离不开的食物，所以温室大棚技术越来越重要，而温度控制是最为重要的一环。考虑到PLC具有灵活性、操作简单等优点，所以设计出了基于PLC的温度控制系统。该论文介绍了温室控制系统的构成，包括信息采集部分、智能控制部分以及最后的执行部分。由于温度的变化因素很多，包括光照、湿度、通风等因素，所以本次设计的系统中包括了升降温系统、补光系统、遮阳系统、加湿系统、CO2系统、通风系统，来综合调整温度的变化保证温度的准确度。根据设计需要和经济综合因素的考虑选用了西门子S7-200型PLC的控制，这样既能够满足输入与输出控制，又有比较高的性价比。在设计中给出了控制系统的软硬件设计，并用STEP7软件进行对梯形图的输入、调试与仿真，能够完全符合设计需求。关键词传感器PLC模糊控制器MCGS组态软件电机第II页GreenhouseControlSystemBasedonPLCABSTRACTWiththeimprovementofpeople'slivingstandardantiseasonvegetablesbecomepeopleareincreasinglyinseparablefromthefood,sothegreenhousetechnologyismoreandmoreimportant,andthetemperaturecontrolhasbecomethemostimportantpart,sothePLCcontrolsystemofgreenhousebasedon.TemperaturesensorandPLCarethecoreofthegreenhousecontrolsystem,theyhaveadirectimpactontheworkingstatusofthesystem.Itsworkingprocessisthewhenthetemperaturesensortocollectthesignalistransmittedtothefuzzycontroller,thefuzzycontrollerbythesignalconversionandcomparativeanalysis,thenthesignaltransformationoutputsignaltotheMCGSconfigurationsoftwareisusedtojudgetheandthesignalistransmittedtothePLC,PLCreceivesthesignalandcontrolmotorworkingtemperaturecontrol.MCGSconfigurationsoftwarewherethecomputerisalsoaplatformforhuman-computerinteraction.KeywordsTemperatureSensorPLCFuzzyControllerMCGSConfigurationSoftwareElectricMachinery目录第1章绪论..........................................................................................................................11.1课题背景...................................................................................................................11.2国内外研究现状......................................................................................................11.3内容安排...................................................................................................................2第2章系统总设计方案....................................................................................................32.1系统总体设计思路.................................................................................................32.2设计概要图...............................................................................................................3第3章系统硬件方案设计................................................................................................63.1信息采集电路的设计.............................................................................................63.1.1温/湿度传感器的选择..................................................................................63.1.2光照传感器的选择........................................................................................73.1.3CO2传感器的选择.........................................................................................73.2主控制电路设计......................................................................................................83.2.1PLC的选择.....................................................................................................83.2.2PLC内部接线图............................................................................................93.2.3模糊控制器设计原理..................................................................................103.3系统执行部分设计................................................................................................113.3.1正反转部分设计...........................................................................................113.3.2开关类设计...................................................................................................123.4系统主电路图........................................................................................................13第4章系统软件方案设计..............................................................................................154.1STEP7Micro/Win软件简介................................................................................154.2STEP7-Micro/WIN编程软件主要功能.............................................................154.3STEP7-Micro/WIN编程方法..............................................................................164.4PLC系统软件介绍...............................................................................................16第5章系统调试...............................................................................................................235.1仿真软件简介........................................................................................................235.2控制程序的仿真与调试......................................................................................235.2.1仿真与调试准备工作..................................................................................235.2.2程序仿真与调试..........................................................................................23结论.........................................................................................................................................25致谢.........................................................................................................................................26参考文献................................................................................................................................27