Human-Machine Interface (HMI)

Categories:
Stand Alone Controllers

Description

An HMI (Human-Machine Interface) is a user interface device that allows operators to monitor and interact with machines, processes, or entire control systems. It typically consists of a touchscreen panel or display unit that connects to a PLC, DCS (Distributed Control System), or other automation controllers.

HMIs display live data such as temperatures, pressures, alarms, motor status, flow rates, and allow operators to input setpoints, start/stop equipment, or change process variables. They are essential in industrial automation, HVAC control, building management systems, and production lines.

HMIs can be basic LED/LCD panels or advanced graphic terminals with high-resolution color displays and internet connectivity.

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Specifications

  • Display Type:

    • Touchscreen (resistive or capacitive)

    • TFT or LCD display

    • Size ranges from 4.3" to 15" or larger, depending on application

  • Resolution:

    • Standard: 480×272 (WQVGA), 800×480 (WVGA)

    • Advanced: 1024×768 (XGA) and Full HD options

  • Communication Interfaces:

    • Serial (RS232, RS485)

    • Ethernet (Modbus TCP/IP, Profinet, Ethernet/IP)

    • USB ports (for program updates or data logging)

    • SD card slot or onboard storage

  • Supported Protocols:

    • Modbus RTU / TCP

    • Siemens S7 (MPI/Profinet)

    • Allen-Bradley Ethernet/IP

    • Omron, Mitsubishi, Schneider, etc.

  • Software:

    • Configurable using vendor-specific software such as:

      • Siemens WinCC

      • Schneider Vijeo Designer

      • Allen-Bradley FactoryTalk View

      • Weintek EasyBuilder

      • Delta DOPSoft

  • Functions:

    • Real-time display of process values

    • Data logging and historical trend viewing

    • Alarm monitoring and management

    • Password protection and user access control

    • Recipe handling for batch operations

  • Power Supply:

    • 24V DC (typical)

    • Some models accept wide voltage input (e.g., 12–30V DC)

  • Mounting:

    • Panel-mounted or wall-mounted

    • DIN rail mount for small text displays

  • Operating Environment:

    • Temperature: -10°C to +60°C

    • Humidity: 10% to 90% non-condensing

    • Protection class: IP65 (front panel), IP20 (rear)

  • Applications:

    • Industrial automation systems

    • HVAC system control and monitoring

    • Water treatment facilities

    • Food and beverage production

    • Packaging and bottling systems

    • Building management systems (BMS)

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