The upper computer is a computer or software system in a computer control system that is responsible for monitoring, managing and controlling the lower computer (usually industrial equipment, sensors, etc.). The following is a detailed explanation of the working principle and role of the upper computer:

The working principle of the host computer:
    Data acquisition and processing:
    The upper computer communicates with the lower computer through various communication protocols (such as Modbus, Ethernet/IP, etc.) and obtains real-time data from the lower computer.
    The data obtained may include sensor data, device status, operating parameters, and more.
    Data storage and management:
    The upper computer stores the data obtained from the lower computer to a database or file for subsequent analysis and historical data query.
    Databases are often used to store large amounts of real-time and historical data, supporting fast retrieval and data analysis.
    Monitoring and control:
    The upper computer displays real-time data, alarm information and device status through the user interface (GUI).
    The operator can monitor the operation of the equipment through the upper computer interface, and control the equipment and adjust the parameters.
    Data analysis and:
    The upper computer can analyze real-time and historical data, generate reports and charts, and help users evaluate equipment performance and operating status.
    Data analysis helps to predict equipment failures, optimize production processes and improve equipment utilization.

The role of the host computer:
    Centralized management and monitoring:
    The upper computer integrates data and control functions of multiple lower computers to realize centralized management and monitoring of the whole system.
    The operator can know the system status in real time through the upper computer interface, and discover and respond to abnormal situations in time.
    Improve production efficiency:
    The upper computer can analyze and monitor the key parameters in the production process in real time to help optimize the production process and improve production efficiency.
    Automated control features reduce human error and improve production line stability and reliability.
    Data analysis and decision Support:
    The upper computer provides detailed data reports and charts to support the data-driven analysis of management in decision making.
    Long-term data storage and analysis help predict equipment maintenance cycles and develop long-term production plans.
    Fault diagnosis and maintenance:
    Through real-time monitoring and alarm function, the upper computer can quickly respond to equipment failures and abnormal situations.
    Provides historical data query and analysis to help locate and resolve problems quickly and reduce downtime.