Mitsubishi GT2508-VTBD / GT2508-VTBA Graphic Operation Terminal (GOT1000)

The Mitsubishi GT2508-VTBD and GT2508-VTBA are human-machine interface (HMI) panels belonging to the GOT1000 series. These 8.4-inch diagonal TFT LCD displays offer high brightness (350 cd/m²) and 640x480 pixel (VGA) resolution, providing clear visualization for machine control and monitoring. The VTBD model features a built‑in RS‑232 and RS‑422/485 interface, while the VTBA variant includes an additional Ethernet port for network connectivity. Both models support touch operation and are designed for demanding industrial environments.

Technical Specifications

• Models: GT2508-VTBD (standard serial), GT2508-VTBA (serial + Ethernet)

• Display Size: 8.4 inches diagonal

• Display Type: TFT color LCD, 65,536 colors

• Resolution: 640 x 480 pixels (VGA)

• Brightness: 350 cd/m² typical

• Backlight: LED (50,000 hours half-life)

• Touch Panel: Resistive analog, 1024 x 1024 touch resolution

• User Memory: 9 MB flash (for screens, recipes, logs)

• Communication Ports:

• GT2508-VTBD: RS‑232, RS‑422/485

• GT2508-VTBA: RS‑232, RS‑422/485, Ethernet (10BASE-T/100BASE-TX)

• USB Ports: 1x USB host (for mouse/keyboard/data transfer), 1x USB device (for programming)

• Protection Rating: IP67F (front panel), IP20 (rear)

• Operating Temperature: 0°C to 50°C

• Power Supply: 24V DC (10W typical)

• Dimensions (W x H x D): 241mm x 188mm x 52mm

• Weight: 1.6 kg

Display and Touch Features

The VGA resolution provides detailed screen layouts even for complex machinery schematics. The anti‑glare front surface reduces reflections under factory lighting. The resistive touch panel can be operated with gloved hands or stylus, and it supports two‑point calibration for accuracy. The LED backlight is dimmable via software, and its lifetime eliminates the need for periodic backlight lamp replacement.

Connectivity and Integration

The GT2508 series directly connects to Mitsubishi PLCs including MELSEC iQ-R, iQ-F, Q, L, and FX series via built‑in protocols (MELSEC protocol, MC protocol). The Ethernet model supports OPC UA, Modbus TCP, and FTP for data exchange with SCADA systems or file upload/download. The RS‑422/485 port allows multi‑drop connection to up to 32 devices. Additionally, the HMI can host up to two optional communication modules (e.g., CC-Link, PROFIBUS) in its expansion slot.

Programming and Software

Screen development is done with Mitsubishi's GT Works3 software. The software supports vector graphics, recipe management, alarm logging, data sampling, and script execution (VBScript). Projects can be transferred via USB, Ethernet, or SD card. The HMI also supports remote monitoring through a web browser (embedded web server on Ethernet model).

Data Logging and Recipes

The internal 9 MB flash memory stores up to 500 screens and 2000 alarm records. Data sampling (trend logs) can be saved to a USB memory stick or SD card (external slot on the side). Recipe data can be stored in CSV format for easy editing on a PC. The HMI can also send logged data to an FTP server periodically.

Safety and Environmental

Front panel meets IP67F (oil‑resistant), allowing washdown in food and beverage applications. The rear is IP20 and must be mounted in an enclosure. The HMI is UL 508, CE, and RoHS compliant. It withstands vibration of 5g (10–150Hz) and shock of 15g. Storage temperature: -20°C to 60°C.

Typical Applications

These HMIs are used on packaging machines, printing presses, CNC machine tools, injection molding machines, and automated assembly lines. The Ethernet model is preferred for systems requiring connection to a plant network or remote diagnostics.

Installation Notes

Cut a panel opening of 218mm x 158mm ±2mm. Secure the HMI with the included mounting brackets. Ensure a minimum of 100mm clearance behind the panel for cables. Connect the 24V DC supply to the power terminal (reverse polarity protected). For the Ethernet model, use a shielded Cat5e or better cable. The USB host port can supply up to 500mA to connected peripherals.

Conclusion

The Mitsubishi GT2508-VTBD and GT2508-VTBA offer a reliable, high‑visibility HMI solution with flexible connectivity, enabling efficient machine operation and data management in industrial environments.