At present, most of the monitoring of building equipment is based on manual inspection. For some equipment that needs real-time monitoring, maintenance personnel are usually placed next to the equipment. Of course, the drawbacks of this model are also obvious. It not only consumes a lot of human resources, but also greatly increases the cost of monitoring. The current online equipment failure monitoring system mostly adopts the acquisition card and PC mode. The acquisition card is responsible for collecting data, and the PC is responsible for data processing and transmission. This kind of system is bulky and expensive, and is not suitable for applications where the production equipment is dispersed and the work environment is harsh. In order to solve these problems, this paper applies intelligent router related technology and Internet technology to the design scheme of equipment monitoring system, making the equipment failure detection system have remote monitoring function.
1, remote equipment monitoring system principle
The Internet-based remote device monitoring system designed in this paper mainly consists of four parts: building equipment or industrial equipment, PLC control cabinet, intelligent router, and remote server. The building equipment can include air conditioning, lighting, etc. The main function of the PLC control cabinet is to control the opening and closing of the equipment. The role of the remote server is to store the equipment's real-time monitoring information so that the user can view the server in real time through the computer, tablet or mobile phone. Another function is to push an alert message to the user terminal when it is detected that the device data is abnormal.
2, smart router design
This article will use Cortex-A8 embedded boards to model smart routers. The software design of the intelligent router mainly includes the embedded linux operating system, web server lighttpd, database mysql, modbus protocol, and monitoring device application. The main hardware on the smart router includes the processor, 3G module, Ethernet port, serial port and SD card slot.
2.1 Data Acquisition
This article uses modbus as the transmission protocol for real-time data of the device, and uses the serial port and Ethernet port as the data collection methods. The final data is transmitted to the server through the Ethernet or 3G network, and the data is stored in the server database. The data obtained from the device will all be stored in the SD card of the smart router, and the data uploaded to the server needs only a key part of it. When you need to get all the detailed data, you can also remotely log in to the smart router for viewing. This will not only greatly reduce the capacity of the server to store data, but also greatly reduce the bandwidth required by the client.
2.2 Main software instructions
Open Wrt is an open source linux distribution with excellent extensibility and powerful networking components for all types of embedded devices and routing devices. Open Wrt's file system is writable, meaning that users can add as much functionality as they need without recompiling the entire system firmware. Lighttpd is an open source web server software designed for high-performance websites with features such as good performance, low memory overhead, rich modules, and very low CPU usage. Lighttpd is designed to provide a site server environment that is well-suited for high performance, fast, secure and flexible.
3, part of the software system to achieve
3.1 Adding New Devices to Be Monitored
Each device to be monitored is uniquely identified by its own device name, device ip, device id, and device port. The system also generates a unique hash value for the device. In data monitoring, the system also stores the hash value as the unique identifier of the device. The purpose of this is to make it possible to modify the device information in the future without modifying too many data tables. Under normal circumstances, in order to better understand the operating status of a device, it is often more than just monitoring one device point of the device, but multiple, and each monitored point may need to be different depending on the sensitivity of its own data. Data monitoring speed. In order to facilitate the user to add new equipment and various information of equipment points and alarm points that need to be monitored, the system provides the user with the tftp transmission mode, so that the user can directly transmit the monitoring file with the specified format to the intelligent router. The user only needs to fill in the relevant file name and tftp server ip when adding a new device.
3.2 Alarm processing
The monitoring system designed in this paper is applied to most of the monitored devices. In addition to monitoring the switching status of the light bulb, which is only on and off, it is also necessary to monitor such numerical values ​​as temperature and humidity. Compared with the numerical value, the switch quantity will be relatively simple to monitor. The monitoring of the numerical value is slightly more complicated because the value of the numerical value is smooth, so that the value may fluctuate up and down from the alarm value in the case of external disturbance. Eventually the system will appear to alarm without warning. In order to solve the above problem, this paper sets a buffer for the numerical alarm value. When the status is no alarm, the alarm will be activated only when the value of the numerical value is greater than the value of the alarm point. When the status is an alarm, the alarm is canceled only when the value of the numerical value is smaller than the value of the alarm point. It mainly includes data acquisition programs and alarm programs. In addition, considering that the data may be subject to data jitter due to external interference, processing is only given when the data value reaches the state transition area and continues for a certain period of time in the area.
Conclusion
This article focuses on the basic principles of system work, and describes in detail the main part of the system hardware circuit design and system software. Compared with traditional IT operation and maintenance services, Internet-based IT operation and maintenance services have more advantages. With the continuous deepening of Internet applications, smart routers will be more widely used and developed. The design of remote monitoring systems in this paper will also play a positive role and role.
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