In recent years, data acquisition and application technologies have received more and more attention, and data acquisition systems have been rapidly applied in all walks of life. Among them, PLC control data acquisition system is currently the most widely used in the field of industrial automation control. The application of HiNet industrial intelligent gateway developed by Huachen Zhitong in PLC data acquisition system in recent years has the characteristics of small size, realization of PLC remote programming localization, strong PLC data acquisition function, communication with PC, convenient and flexible use, etc.
2. PLC data acquisition system1) System information flow The following system information flow shows the data interaction flow between different services and databases of the system and applications.
In the above figure, various field data are collected in real time by the data collection service through a specific data collector and stored in the real-time historical database. The real-time historical database also provides real-time data and historical data of production site equipment. For the system configuration engineer, the application configuration service is used to configure the system through its client Web interface, and the configured model data will enter the model database.
The business logic and calculations required by the system application modules will be calculated and related operations for real-time historical data and business logic or calculation formulas configured in the model library through the calculation and application engine, and the results will be written into the real-time historical database for archiving.
The data of the client interface will be provided through the Web data service, which will be integrated according to the object organization mode in the device model library and the data in the real-time historical database, and displayed on the final interface of the client according to the configured display drawings.
2) System composition The structure of the PLC remote data acquisition system is shown in the figure. The hardware and software of the data acquisition system are used to collect real-time status, parameters, faults and other data of equipment including PLCs, meters or industrial computers. Through the VPN method, The collection system transmits data remotely to the cloud communication service. The cloud communication service receives and processes the data and stores it in the data server. After the data is processed by the application server, the data is provided to the WEB terminal (PC, tablet, mobile phone) through web or webservice or The APP side is used for display, analysis, diagnosis and management interfaces.
3) System characteristics
a. Powerful protocol analysis capability, HiNet industrial intelligent gateway can be compatible with Siemens, Mitsubishi, Hollysys and other brands and models of PLC at the same time;
b. Various communication interfaces, which can use Rs232/485 and Rs422 to communicate with the gateway at the same time;
c. Super environmental adaptability, with multiple communication methods such as WiFi, 3G, Ethernet, etc., to adapt to various complex industrial environments;
d. Very high security, HiNet industrial intelligent gateway adopts VPN dedicated secure communication channel, RSA encryption algorithm to ensure communication security, and strictly prevent data leakage;
e. Extremely strong stability. HiNet industrial intelligent gateway supports disconnection and reconnection, abnormal recovery, and system self-monitoring to ensure that the equipment is online in real time and the normal operation of the monitoring system.
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