中文摘要：

有效控制温室温湿度环境是温室业研究的重要课题之一,以西门子S7-200系列小型PLC作为控制器,组建温室自动监控系统,可实时采集控制温室的温湿度,并利用串行口通信实现与上位PC机的信息交互,用户可通过上位机监控软件监测温湿度信息,并可选择手动或自动两种控制模式实现温湿度调节控制。通过试验,该系统实现了温室温湿度信息的采集、显示与预警,并能够可靠实现温湿度控制;上位机监控软件界面友好,操作方便,能够保存采集的温湿度信息,方便用户进行数据分析。该设计对于温室环境自动监控以及PLC实践教学具有一定实际意义和应用价值。

英文摘要：

It is one of the important issues in the greenhouse industry to effectively control the temperature and humidity of greenhouse. This article describes a PLC-based greenhouse automatic monitoring system. The S7-200 PLC of SIEMENS is used as controller to collect and control the temperature and humidity information of greenhouse. The PLC communicates with the host PC by serial port. The host PC monitors the PLC to collect and control the temperature and humidity of greenhouse by PC monitoring software. Users can select manual or automatic control mode. In the test, the system has realized the acquisition, display and alarm functions about the greenhouse temperature and humidity information, and can reliably control the temperature and humidity. The PC monitor software is convenient for user operation. The design has a certain practical significance and application value for greenhouse environment monitoring and PLC practice teaching.