Research and Implementation of Remote Monitoring Based on WEB Communication Power Supply

With the development of IT technology, the general implementation of LAN, WAN and Internet has been promoted in all walks of life. Most units have their own websites, and each system has established its own network. Therefore, the reliability requirements for the system are also improved.

The traditional UPS power supply often waits until the machine has a fault and cannot be powered normally. Only the duty personnel can find the fault, which will cost a lot of precious time, and many occasions are not allowed. With the introduction of the microprocessor CPU and monitoring software, the self-test function of the UPS has been greatly increased. Most UPSs are equipped with their own monitoring software. When the UPS fails, the monitoring software can display the faulty parts or devices through the LCD screen on the panel, which saves time.

With the popularity of network technology, users have put forward higher requirements to UPS: UPS should have unattended function, and not only has self-test function, but also has networking function, that is, not only can you observe the UPS at any time on the Internet. The operating parameters, and when the mains or UPS fails, can send information to the server, workstations, etc., but also can call, fax or page to notify the on-duty personnel. Conversely, the development of network technology and information technology has made it possible to monitor the networked power of UPS communication power. The remote monitoring system built on the WEB and integrated into the overall information of the factory is the future development direction.

Database-centric monitoring solution

The traditional monitoring methods are basically database-centric solutions. The control network can be various fieldbuses or other industrial control networks. Each control node communicates through it. The monitoring machine transmits power to the radio. The operation status is monitored, the site information is collected, and processed and transmitted to the real-time database server; the web server obtains data from the real-time database through the server extension module according to the HTTP request sent by the client browser, and then returns the data to the client for browsing. Display. It can be seen that the whole process is built around the real-time database server. This method has many shortcomings in practical applications. For example, compared to the monitoring function, the implementation of the control function is difficult, and the programming is difficult, especially in terms of security such as authentication and encryption. In order to solve the real-time problem, the polling method is generally adopted, and the webpage is refreshed regularly by the client browser, which leads to inefficiency. Some systems also use the event triggering method to actively push data by using the trigger function of the database server, but It generally requires the Web server to be on the same machine as the database server, which is not convenient for system expansion. The database server is the core of the entire system. It needs to process the requests of the Web server and the monitoring machine. The workload is heavy and may become a system performance bottleneck. These shortcomings become more and more obvious as the application model expands, requiring new solutions.

WEB monitoring system

The Web-based power remote monitoring system can be generally divided into three subsystems: the on-site monitoring and control subsystem; the data storage and forwarding subsystem; the client receiving and command sending subsystem. The field subsystem is responsible for collecting the running status data of each field control node, and then transmitting it to the middle layer subsystem; the middle layer subsystem is an intermediary system, which is composed of the industrial computer, the web server and the real-time database server. The industrial computer collects data from the station through the transmitter signal. The web server completes the interaction with the client subsystem and the field subsystem through server extension technologies such as CGI and ISAPI. The client subsystem is the part directly interacted with by the user, and it receives the user's Input, obtain monitoring data from or send control commands to the middle tier subsystem.

The on-site signal acquisition module uses Advantech ADAN4017. The Advantech series data acquisition module is a set of intelligent sensor-to-computer interface modules with built-in microprocessors. They can be controlled by a simple set of ASCII format commands and can transmit data in RS485 communication protocol. It has signal filtering A/D. , D / A conversion, data comparison and digital communication functions. There are no switches on the module to configure parameters and calibration corrections. Only commands from the host can be accepted to change the analog input range, thermocouple or RTD input. The configuration parameters of all modules include I/O address, communication rate, parity, checksum high and low alarms can be set remotely. In addition, the powerful function of the watchdog timer can restart the module when the system fails.

Because the RS-486 network has a low-noise read sensor mode, the module can be placed close to the noise source. Using ADAM's RS-485 receiver module, up to 256 data acquisition modules can be connected to an RS-485 multipoint network. The host is connected to the 485 network via the serial port via the RS-232/RS-485 conversion module.

In the system, the function of the industrial computer differs from the previous description in that it not only communicates with the real-time database server, but also communicates with the application server through the socket Socket, that is, it transmits the collected data to the database server and also receives Control commands from the application server. When the user accesses the system, the browser sends an HTTP request to the web server, and then the AcTIveX control is downloaded to the client along with the HTML file and interpreted by the browser. The AcTIveX control establishes a Socket connection with the application server, and the user performs the monitoring operation through the AcTIveX control. The interface is ready to go.

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