PRO-FACE GP370-LG21-24VP HMI Touch Screen

The PRO-FACE GP370-LG21-24VP is a 5.7-inch STN color touch screen human-machine interface from the GP3000 series, designed to provide reliable operator interface functionality for industrial automation systems. This HMI unit operates on 24V DC power and offers a comprehensive set of communication options for connection to PLCs, drives, and other control devices.

Product Overview

The GP370-LG21-24VP belongs to the Pro-face GP3000 series of graphical operator interfaces, which are widely used in manufacturing, packaging, and process control applications. The unit features a 5.7-inch STN color LCD display with 320 x 240 pixel resolution, providing clear visualization of machine status, process data, and operator controls. The touch screen technology allows intuitive interaction with the control system, reducing operator training requirements and improving productivity. The GP370 series HMIs are built for industrial environments with robust construction and wide operating temperature range. The unit includes a built-in serial communication port supporting RS-232C and RS-422/485 protocols, enabling direct connection to a wide range of PLC brands including OMRON, Mitsubishi, Siemens, Allen-Bradley, and others. The display is backlit for visibility in various lighting conditions, with adjustable brightness to suit different work environments.

Technical Specifications

The GP370-LG21-24VP features a 5.7-inch STN color LCD with 16 shades of gray or 256 colors depending on the configuration. The effective display area measures 115.2 mm wide by 86.4 mm high, providing ample space for operator screens, trend graphs, and alarm displays. The touch screen is an analog resistive type, offering high durability and accurate touch detection even when used with gloves. The unit is powered by a 24 VDC power supply with a tolerance of ±10%, consuming approximately 12 W of power. The operating temperature range is 0°C to 50°C, with storage temperatures from -20°C to 60°C. The humidity range is 10% to 90% non-condensing. The front panel meets IP65 protection standards when properly installed, making it resistant to dust and water jets from any direction. The unit dimensions are approximately 168 mm wide, 136 mm high, and 50 mm deep, with a weight of approximately 0.9 kg.

Communication and Connectivity

The GP370-LG21-24VP includes one built-in serial communication port that supports RS-232C, RS-422, and RS-485 protocols. This versatility allows the HMI to connect directly to PLC programming ports, serial communication modules, and other industrial devices without requiring additional converters. The communication parameters including baud rate (up to 115.2 kbps), data bits, parity, and stop bits are configurable through the GP-Pro EX configuration software. The HMI supports over 200 native communication drivers for major PLC brands, simplifying system integration. The unit also includes a USB port for programming and data transfer, allowing fast download of project files and upload of recipe data or log files. An optional Ethernet module can be added for network connectivity, enabling remote monitoring and data exchange with enterprise systems.

Memory and Data Handling

The GP370-LG21-24VP is equipped with ample memory for storing project files, recipes, and logged data. The user project memory capacity is approximately 4 MB for screen data and logic. The HMI supports data logging to internal memory or external USB storage, with the ability to store up to 65,000 data points per log file. The recipe function allows storage and retrieval of multiple parameter sets, enabling quick changeover between different product types or operating modes. The unit includes a real-time clock with battery backup for time-stamping events and executing scheduled tasks. The clock accuracy is ±30 seconds per month, with automatic leap year adjustment. The battery life for the real-time clock is typically 5 years under normal operating conditions.

Programming and Configuration

The GP370-LG21-24VP is programmed using Pro-face's GP-Pro EX software, a Windows-based development environment that supports drag-and-drop screen creation, extensive object libraries, and scripting capabilities. The software includes over 4000 predefined graphics and symbols, reducing development time. The HMI supports ladder logic and script programming for local processing of data, allowing the unit to perform calculations, comparisons, and data manipulation independently of the PLC. The software provides simulation capabilities that allow testing of HMI projects without connecting to actual hardware. The project download is performed via USB, serial, or Ethernet (with optional module). The HMI also supports remote monitoring and control via web server functionality when equipped with the Ethernet option.

Applications

The GP370-LG21-24VP is suitable for a wide range of industrial applications requiring operator interface and machine control. Typical uses include packaging machinery where the HMI displays production counts, fault messages, and machine parameters; conveyor systems requiring speed adjustment and monitoring; small assembly stations where operators need to select product types and monitor quality; pump and fan controls where operators need to view pressure, flow, and temperature readings; and industrial ovens or dryers where temperature setpoints and profiles are managed through the touch screen. The unit's compact size makes it ideal for installation on machine panels or in operator stations where space is limited. The GP370 series is also suitable for retrofit applications, replacing older pushbutton and indicator panels with a modern graphical interface.

Environmental and Installation Specifications

The GP370-LG21-24VP is designed for reliable operation in industrial environments. The unit should be mounted in a control panel with proper cutout dimensions of 158 mm wide by 126 mm high. The panel thickness should be between 1.6 mm and 6 mm to ensure proper sealing with the included gasket. The unit is secured with four mounting brackets that are included with the HMI. Adequate clearance around the unit is required for ventilation and cable access, with recommended clearances of 100 mm on all sides. The unit must be protected from direct sunlight, excessive vibration, and corrosive gases. The power supply should be clean and well-regulated, with proper filtering to prevent electrical noise interference. The communication cables should be shielded and routed separately from power cables to maintain signal integrity.

Maintenance and Support

The GP370-LG21-24VP requires minimal maintenance under normal operating conditions. The touch screen surface can be cleaned with a soft, damp cloth using mild detergent. Do not use abrasive cleaners or solvents that may damage the screen coating. The unit's backlight has a typical lifetime of 50,000 hours at 25°C, gradually dimming over time. Replacement of the backlight should be performed by qualified service personnel. The battery for the real-time clock should be replaced every 5 years, with the unit retaining its settings during battery change if performed quickly. Pro-face provides technical support and documentation for the GP3000 series, including user manuals, programming guides, and application notes. Firmware updates are available through the GP-Pro EX software, adding new features and communication drivers as they become available.