MITSUBISHI ELECTRIC GT25 Human Computer Interface Application Guide

MITSUBISHI ELECTRIC GT25 Human Computer Interface Efficient Application and Maintenance Guide

In industrial automation sites, human-machine interface (HMI) is not only a visual bridge between operators and equipment, but also a core node for data acquisition, remote monitoring, and system maintenance. The Mitsubishi Electric GT25 series graphic operation terminal fills the key gap in the mid-range HMI market with its high performance and cost-effectiveness. This series offers SVGA/VGA displays ranging from 8.4 inches to 12.1 inches, equipped with rich communication expansion capabilities and wireless options, making it particularly suitable for cost sensitive but functionally demanding application scenarios. This article will focus on the core functions of the GT25 series, including GOT Mobile, system launcher, MES interface GOT Drive）、 Deeply analyze hardware interfaces, engineering maintenance practices, and typical industry applications to help automation engineers fully unleash the potential of the platform.

Product positioning and series overview

The GT25 series is positioned at the core level of the Mitsubishi GOT2000 family, between the economical GT21 and the high-end GT27. Its main advantages are:

Cost effectiveness: Providing highly competitive prices without sacrificing critical performance.

Display specifications: 8.4-inch (SVGA 800 × 600) or 12.1-inch (VGA 640 × 480) TFT LCD screen, depending on the model.

Processing performance: 32MB ROM is used for firmware and engineering storage, and 80MB RAM is used for running cache to ensure smooth loading of complex images.

Scalability: Supports wireless communication units (such as Bluetooth/Wi Fi) and various industrial network protocols.

GT25 is suitable for device level operation panels, production line data acquisition stations, remote maintenance nodes, and servo drive debugging terminals.

Detailed explanation of core functions

2.1 GOT Mobile - Remote Monitoring and Operation of Mobile Devices

GT25 has built-in web server functionality, and through "GOT Mobile" authorization, users can access HMI screens using standard browsers on tablets, smartphones, or PCs.

Technical implementation:

As a web server, HMI publishes HTML pages containing real-time data.

Supports Ethernet or wireless network connection without the need to install a dedicated app.

The page adapts to different screen sizes and supports touch operations.

Engineering value:

Production management personnel can view equipment status (output, fault information, trend charts) in the office.

Maintenance personnel can perform simple resets or parameter adjustments outside the site.

No need to purchase additional SCADA systems, significantly reducing the cost of mobile monitoring.

Security precautions: It is recommended to set VLAN isolation at the routing level, enable password protection and HTTPS encryption (please confirm that GT25 supports version), to prevent unauthorized access.

2.2 GOT2000 system starter - PLC diagnosis without cabinet opening

The system launcher is a groundbreaking maintenance feature of the GT25. It allows operators to directly check the status of PLC and network modules through HMI without opening the electrical cabinet to connect to the PC.

Operation process:

Call the "System Starter" screen on the HMI.

Display all PLC modules (power supply, CPU, input/output, intelligent function modules) in a graphical configuration diagram.

Touch any module icon to pop up an extended function menu (such as module diagnosis, buffer memory monitoring, test mode).

Perform soft reset of faulty modules, clear error logs, and monitor I/O status.

Typical application scenarios:

When the remote workshop encounters a PLC alarm, the operator can view the specific module error code through HMI and provide telephone guidance to the electrician to replace the module or check the wiring.

No need to carry a laptop or programming cable with you, especially suitable for factories with multiple devices distributed widely.

2.3 MES Interface - Direct Connection from Site to Enterprise Database

The GT25/GT27 series breaks through the limitation of traditional HMI only communicating with PLC and has built-in MES gateway function. Through this feature, HMI can directly communicate with database servers such as SQL Server and Microsoft Access.

Data flow:

Data from on-site equipment (PLC, temperature controller, frequency converter, etc.) → GT25 collection → Inserting or updating records in database tables through SQL statements.

Reverse: Production instructions or recipe data in the database can be sent to the PLC.

Typical configuration:

Use the multi communication capability of GT25 (simultaneously connecting multiple PLCs, serial devices, Ethernet devices) as a data aggregation gateway.

Configure MES action settings (timed or triggered execution of SQL commands) in GT Works3.

The factory MES system reads data directly from the database without the need for additional programming interfaces.

Advantage:

Eliminate the intermediate upper computer or industrial gateway hardware.

Reduce total cost of ownership, especially suitable for small and medium-sized discrete manufacturing production lines.

2.4 GOT Drive - Debugging and Monitoring of Servo Amplifier

GT25 has advanced connection function with Mitsubishi MR-J4 and MR-JE series servo amplifiers. Through the GOT Drive function, engineers can directly complete the following tasks on the HMI:

Parameter settings: Read/write servo parameters, backup parameter set.

Trial operation: jog, positioning operation, automatic tuning.

Status monitoring: Real time display of position, speed, torque, and alarm codes.

Waveform diagnosis: Collect servo operation waveforms to assist in analyzing faults such as oscillation and overshoot.

Engineering value:

No need to use dedicated MR Configurator software or PC, most debugging can be completed through HMI alone.

Significantly reduce startup and maintenance time.

On site operators can easily view the servo alarm content and quickly reset.

2.5 Dual USB ports and extended storage

GT25 is equipped with two USB interfaces (one Host and one Device):

USB Host (Type A): Used to connect a USB mouse, keyboard, barcode scanner, RFID card reader, or USB flash drive. It can achieve data log export, engineering file update, and batch import of formulas.

USB Device (Mini-B): Used to connect to a PC to transfer engineering files or expand communication through a USB to serial adapter.

Memory capacity: 32MB ROM (user engineering storage), 80MB RAM (runtime). It is recommended to control the size of engineering files within 80% of the ROM capacity to ensure performance.

Key points for hardware installation and communication configuration

3.1 Installation environment requirements

Working temperature: 0~55 ℃, storage temperature: -20~60 ℃.

Humidity: 10%~90% RH (without condensation).

Protection level: front panel IP67F (only for front installation), back IP20.

Avoid direct sunlight, corrosive gases, and strong electromagnetic interference sources.

3.2 Power Wiring

Supply voltage: 24V DC (-15%~+20%), ripple ≤ 200mV p-p.

Power consumption: Depending on the backlight brightness and expansion unit, the typical value is about 15W.

It is recommended to use an isolated power supply and separate it from devices such as frequency converters for power supply.

3.3 Construction of Communication Network

GT25 supports the following interfaces (depending on the specific model):

Ethernet: used for communication with PLC (MELSEC iQ-R/Q/L/F), GOT Mobile, MES database.

Serial port (RS-232/422/485): Connect Mitsubishi FX series PLC or third-party devices (such as temperature controllers, frequency converters).

CC Link IE Field Fundamentals: Optional.

Multi protocol simultaneous communication: GT25 can simultaneously serve as:

Exchange data with the main PLC (such as Q series) through Ethernet.

Connect to the barcode scanner via USB Host.

Directly connected to the upper database through MES interface.

Wireless option: After installing the GT25-WLAN wireless module, it can connect to the network through Wi Fi, avoiding difficulties in on-site wiring. Suggest using WPA2-PSK encryption.

Suggestions for engineering development and graphic design

4.1 Software Development: GT Works3

Supports all GOT2000 series, including GT25.

Built in rich graphics library, script (GT SoftGOT), recipe, alarm, trend chart functions.

Support simulation operation, testing logic without the need for an actual HMI.

4.2 Performance Optimization Techniques

Avoid using too many high-resolution images or animations, as they may affect the refresh rate.

Place data with low frequency of change (such as device parameters) on different pages to reduce backend communication load.

Manage large amounts of product data using indirect addressing and recipe functionality.

4.3 Security Settings

Password protection: Different levels can be set (operator, engineer, administrator).

Prohibit upload function: Protect project files from illegal copying.

Anti tampering log: records critical operations (such as parameter modification, system startup, etc.).

Maintenance and Troubleshooting Practice

5.1 Daily inspection items

Whether the touch screen response is accurate (calibration can be performed).

Whether the backlight brightness is uniform (the lifespan of LED backlight is about 50000 hours).

Is there any abnormal noise from the fan (if configured).

Is the communication indicator light flashing normally.

5.2 Common Fault Phenomena and Countermeasures

Possible causes and solutions for the fault phenomenon

The screen is not displaying, the power LED is not lit, and there is a power failure or wiring error. Measure the 24V input voltage and check the polarity and fuse.

Touch failure, surface contamination or calibration loss in a certain area. Clean the screen and enter the system menu to recalibrate.

The project is unable to download USB drivers or the GT Works3 version does not match the installation of Mitsubishi USB drivers. Please confirm that the project version is ≤ HMI firmware version.

GOT Mobile is unable to access due to incorrect IP address settings or firewall blockage. Check HMI network parameters and try ping test. Open port 80.

MES database write failed due to SQL syntax error or insufficient permissions. Test SQL statements in GT Works3 and check database user permissions.

Check communication parameters (baud rate, data bits, station number) and test the loop for cable breakage and protocol setting errors during communication timeout with PLC.

Slow screen switching, approaching full memory or complex scripts, reducing the number of objects per page, optimizing script loops.

5.3 System Starter Advanced Applications

Module fault diagnosis: When the PLC reports "SP.UNIT ERROR", check the detailed error of the specific intelligent module through the system starter (such as AD module disconnection).

Backup and recovery: Directly backup PLC programs through USB flash drive (with PLC support), without the need for a PC.

Ladder diagram monitoring: In conjunction with GOT's "Ladder Monitor" function (requiring additional authorization), PLC ladder diagrams can be monitored online on HMI, greatly improving on-site troubleshooting efficiency.

5.4 Remote Maintenance Plan

By using GOT Mobile and VPN routers, engineers can connect to the factory HMI at home, view alarm records, and upload new screens.

For multiple sites, Mitsubishi's "GOT Remote Service" cloud platform (GT27 or specific version required) can be used to achieve secure remote penetration.

Typical Industry Application Cases

6.1 Packaging Machinery (Pillow Packaging Machine)

Requirements: Multi temperature zone control, servo cutting, production counting, formula management.

Configuration: GT25 (8.4 inches)+FX5U PLC+MR-JE servo.

Highlight: Use formula function to store set values for different packaging specifications; Debugging servo trimming curve through GOT Drive; The MES interface uploads the production output to the workshop database.

6.2 Peripheral equipment of injection molding machine (robotic arm, mold temperature machine)

Requirement: Real time display of robotic arm position and alarm information, supporting remote diagnosis.

Configuration: GT25 (12.1 inches)+Q series PLC+Ethernet.

Highlight: The system starter quickly locates PLC communication faults; GOT Mobile allows supervisors to view the operational efficiency of robotic arms in the office.

6.3 Small scale water treatment control system

Requirement: Monitor pumps, valves, liquid levels, and flow rates, and store data in SQL Server.

Configuration: GT25+FX3U PLC+serial port instrument.

Highlight: GT25 can simultaneously read PLC and serial instrument data, and directly write them into the database through MES interface without the need for an upper computer.

Selection suggestions and accessory selection

Display size: When displaying complex trend charts or large amounts of data, select 12.1 inches (VGA 640 × 480); When high-resolution display of fine graphics is required, choose 8.4-inch SVGA (800 × 600).

Storage Expansion: Standard projects typically have less than 20MB, with 80MB of RAM sufficient; If you need to record data logs (CSV) for a long time, it is recommended to use a USB flash drive.

Wireless requirements: Choose the GT25 WLAN model or order a wireless communication unit (GT25 WiFi).

Environmental adaptability: For high temperature or strong vibration environments, the GT25 oil proof type or equipped with a cooling fan can be selected.

Accessories

USB protective cover (prevents dust from entering)

Installation bracket and sealing gasket (required for IP67F)

Connecting cable (GT25-C * * * series)

Future Upgrades and Compatibility

GT25 is fully compatible with GOT2000 series engineering files and extension modules. When upgrading from old GOT1000 models (such as GT16, GT15), the engineering conversion tool of GT Works3 can be used, but it should be noted that some objects (such as old alarm lists) may need to be manually adjusted. For applications planning to use new generation networks such as CC Link IE TSN, it is recommended to choose the GT27 series.