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| Design of the Greenhouse Automatic Monitoring System Based on PLC |
Hongtao WANG( ), Hongli LI, Zhenying CHENG, Xiaohuai CHEN |
| School of Instrument Science and Opto-Electronic Engineering, Hefei University of Technology, Hefei 230009, China |
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Abstract 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.
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Received: 31 August 2016
Published: 10 July 2017
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| 输入信号 | | 序号 | 名称 | 符号 | 端子分配 | 备注 | | 1 | 按钮 | SB1 | I0.0 | 启动按钮 | | 2 | 按钮 | SB2 | I0.1 | 停止按钮 | | 输出信号 | | 序号 | 名称 | 符号 | 端子分配 | 备注 | | 3 | 交流接触器 | KM1 | Q0.0 | 通风窗反转 | | 4 | 交流接触器 | KM2 | Q0.1 | 通风窗正转 | | 5 | 交流接触器 | KM3 | Q0.2 | 风机系统 | | 6 | 继电器 | KA | Q0.3 | 供热系统 | | 7 | 电磁阀 | YV | Q0.4 | 灌溉开关电磁阀 | | 8 | 报警系统 | L | Q0.5 | 声光报警 |
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2017, Vol. 36 
