Mitsubishi GT1555-VTBD 5.7-Inch GOT1000 HMI

Description

Key Technical Specifications

Parameter	Value
Manufacturer	Mitsubishi Electric
Model	GT1555-VTBD
Product Family	GOT1000
Series	GT15
Product Type	Graphic Operation Terminal / HMI
Display Type	TFT color LCD
Screen Size	5.7 in
Resolution	VGA, 640 × 480 dots
Display Colors	65,536
Display Area	115 × 86 mm
Touch Technology	Matrix resistive film
Touch Objects	Up to 1,200 objects/screen
Simultaneous Touch	Maximum 2 objects
Touch Life	1,000,000 operations or more
User Flash Memory	9 MB
Power Supply	24 VDC (+25%, −20%)
Power Consumption	19 W or less
Backlight-Off Consumption	14 W or less
Inrush Current	67 A or less, 1 ms at maximum load
Operating Temperature	0 to 50°C
Storage Temperature	−20 to 60°C
Operating Humidity	10 to 90% RH, non-condensing
Installation	Control panel
Protection	IP-rated panel installation; verify complete enclosure arrangement
Standards	IEC 61131-2 / JIS B 3502; UL, cUL, CE, KC, LR, NK, DNV, ABS, RINA, BV
Lifecycle	Discontinued

Mitsubishi Electric’s official specifications identify the GT1555-VTBD as a 5.7-inch TFT color GOT1000 terminal with VGA 640 × 480 resolution, 65,536 colors, and a 24 VDC power supply.

The manufacturer’s lifecycle information lists the GT1555-VTBD as discontinued, with orders ending in March 2017 and production ending in April 2017. Mitsubishi lists the GT2705-VTBD and GT2505-VTBD among replacement candidates, but the compatibility notes matter: panel-cut compatibility does not mean complete functional equivalence, particularly where CF cards, communication units, or option hardware are involved.

 

Product Introduction

The Mitsubishi Electric GT1555-VTBD is a 5.7-inch GOT1000 GT15-series HMI designed for machine operation, process visualization, alarm display, and operator interaction. It uses a 640 × 480 VGA TFT color display, 65,536 colors, and a matrix-resistive touch panel.

The unit accepts 24 VDC and consumes up to 19 W under the manufacturer’s specified conditions. It also provides built-in RS-232 and USB connectivity, with additional interfaces dependent on the installed configuration. This is a legacy HMI, so replacement planning should account for project conversion, communication drivers, storage media, and GT Designer compatibility rather than treating the newer GOT2000 models as a simple electrical swap.

 

Installation & Configuration Guide

Stage 1: Pre-Installation Preparation — Approximately 10 Minutes

⚠️ Safety First

1. Notify operations and establish an approved HMI maintenance window.
2. Place the machine or process in a safe operating state.
3. Apply LOTO to the HMI power circuit where required by site procedures.
4. Verify the 24 VDC supply is isolated.
5. Confirm the voltage with a properly rated multimeter before disconnecting the terminal block.

Tools Required

• ESD wrist strap
• PH1/appropriate screwdriver
• Digital multimeter
• Wire labels
• Smartphone/camera
• Small flat-blade screwdriver where required for terminals

Data Backup

Before removing the existing GT1555-VTBD:

1. Photograph the complete model label.
2. Record the GOT firmware/OS version.
3. Photograph the rear-side communication connections.
4. Photograph the 24 VDC power terminals.
5. Record the PLC/controller communication protocol.
6. Back up the GOT project using the applicable GT Works/GT Designer environment.
7. Record IP/network settings if Ethernet hardware is installed.
8. Record CF-card contents if the existing application uses a CF card.
9. Photograph installed communication and option units.

⚠️ The project file is more important than the HMI itself. Back it up before removing the panel.

Stage 2: Removing the Old HMI — Approximately 5 Minutes

1. Confirm the HMI power is isolated.
2. Verify the 24 VDC terminal voltage is zero.
3. Remove the rear terminal cover if fitted.
4. Photograph every connector before removal.
5. Label the communication cables.
6. Disconnect the power and communication wiring.
7. Release the panel mounting brackets/clamps.
8. Support the GT1555-VTBD from the front while removing the final retaining hardware.
9. Carefully withdraw the HMI from the panel cutout.
10. Inspect the cutout for damage, deformation, or contamination.

Keep the original HMI until the replacement has communicated correctly with the PLC.

Stage 3: Installing the New HMI — Approximately 5–10 Minutes

1. Put on the grounded ESD strap.
2. Verify the replacement model is .
3. Confirm the replacement has the required communication hardware.
4. Inspect the display and touchscreen before installation.
5. Insert the HMI into the existing panel cutout.
6. Install and tighten the mounting brackets evenly.
7. Reconnect the 24 VDC supply.
8. Reconnect RS-232, RS-422/485, Ethernet, USB, or option interfaces as applicable.
9. Confirm connector seating.
10. Check that no cable is under mechanical stress.

Self-Checklist

• model verified
• 24 VDC supply verified
• Project backup available
• Communication interface verified
• Panel mounting secure
• Power polarity checked
• Communication cables secured
• CF/other storage media checked

Stage 4: Power-On & Testing — Approximately 10–15 Minutes

1. Perform a final wiring inspection.
2. Verify the 24 VDC polarity.
3. Energize the HMI.
4. Observe the startup sequence.
5. Check the displayed OS/project information.
6. Verify the touchscreen responds across the complete display area.
7. Confirm the PLC/controller communication link.
8. Check live data values against known PLC values.
9. Test operator pushbuttons and numerical inputs.
10. Trigger a controlled alarm and confirm alarm display.
11. Verify acknowledgment functions.
12. Check trends, recipes, counters, and other application-specific screens.
13. Confirm communication remains stable for several minutes under normal operation.

⚠️ Do not declare the replacement successful simply because the HMI boots. A replacement GOT can power up perfectly while using an incompatible project, communication driver, or option configuration.

Technical Pitfall & Survival Guide

❗ 1. GOT1000-to-GOT2000 Replacement Is Not Just a Panel Swap

Mitsubishi identifies GT2705-VTBD and GT2505-VTBD as replacement candidates for , but the manufacturer’s notes identify important differences. For example, CF-card functionality must be migrated to SD card, and communication/option-unit requirements can affect which replacement is appropriate.

Do not order a replacement based only on panel-cut dimensions.

❗ 2. Project Compatibility

The physical HMI and the application project are separate issues.

Before removing the old terminal, determine:

• GT Designer version
• GOT OS version
• Project version
• PLC model
• Communication driver
• Communication interface
• Screen resolution
• External storage requirements

Keep the original project and a copy of the original HMI configuration.

❗ 3. 24 VDC Power Supply

The operates from 24 VDC (+25%, −20%) and has a maximum specified consumption of 19 W, with up to 67 A inrush current for 1 ms at maximum load.

Do not size the supply only from the steady-state wattage. Check the 24 VDC distribution, wiring, fuse protection, and available startup current.

❗ 4. Touchscreen Aging

This model uses a matrix-resistive touch panel. Mitsubishi specifies a touch life of at least 1 million operations under its test conditions.

For surplus inventory, test the entire touch surface rather than checking only the display. A screen can look perfect while individual touch areas have degraded.

❗ 5. Backlight Condition

The uses a cold-cathode fluorescent tube (CCFL) backlight, and Mitsubishi specifies a backlight life of approximately 75,000 hours or longer under its stated conditions. The backlight is not user-replaceable according to the specification.

For a surplus HMI, verify brightness, uniformity, and backlight behavior before installation.

 

Frequently Asked Questions (FAQ)

Is the Mitsubishi obsolete?

Yes. Mitsubishi Electric lists the as a discontinued product. The manufacturer records an order-end date of March 2017 and a production-end date of April 2017.

For a production machine that still depends on this HMI, keeping one tested spare is worth considering.

What is the display specification of ?

It has a 5.7-inch TFT color LCD, 640 × 480 VGA resolution, and 65,536 colors. The active display area is 115 × 86 mm.

What power supply does use?

The requires 24 VDC, with an allowable range of +25%/−20%. Mitsubishi specifies power consumption of 19 W or less and 14 W or less with the backlight off.

Can I replace with GT2705-VTBD?

Potentially, but do not treat it as a direct plug-and-play replacement. Mitsubishi lists GT2705-VTBD as a replacement candidate and notes panel-cut compatibility, but also documents dimensional and functional differences. Communication units, option units, storage media, and the project itself must be checked.

Will I lose my HMI program when I replace the ?

The project is not automatically transferred simply by installing another HMI. Back up the GOT project before removing the original unit. Also document the OS version, communication configuration, and storage-media contents.

Can be hot-swapped?

Do not assume it can. The HMI uses a 24 VDC power connection and external communication interfaces. Unless the specific installation procedure explicitly permits live replacement, isolate the power before disconnecting the terminal.

What should I check when buying a surplus ?

For a production-critical application, request:

• Photograph of the actual HMI
• Complete nameplate
• Serial number
• Display test
• Full touchscreen test
• Backlight test
• Power-on test
• Communication test
• Connector inspection
• Firmware/OS information
• Condition classification: New Original, New Surplus, or Refurbished/Tested

Mitsubishi has officially discontinued the model, so condition and remaining display/backlight life matter more than simply finding a unit with the correct model number.