







HMI04BU | Eaton Input Operator Interface
- Regular price
- $1,415.00
- Sale price
- $1,415.00
- Regular price
-
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Product Description P/N: HMI04BU
Description
The HMI04BU is part of Eaton’s HMi (PanelMate) series of compact operator interfaces—monochrome, analog touchscreen panels engineered for robust industrial control environments.
Technical Specifications
Condition | New/Never Used Surplus |
---|---|
Brand | Eaton |
Category |
HMI / MMI / OIT
|
Part Number | HMI04BU |
Subcategory | Operator Interface |
Series |
HMi (PanelMate) |
Display Type | LCD Monochrome |
Screen Size |
3.8″
|
Resolution | 320 × 240 pixels (QVGA) |
Power Supply | 24 VDC |
Mounting Type | Panel Mount |
Touchscreen | Analog Resistive |
Communication Ports | RS‑232, RS‑422, RS‑485 |
Functionality | HMI Display, Alarms, Recipes, Logging |
Weight | 0.35 lbs |
Information About HMI04BU
The HMI04BU is part of Eaton’s HMi operator interface family—compact, touchscreen-based control panels designed for reliable monitoring and interaction in industrial automation systems. This 3.8″ monochrome unit supports 320×240 resolution and operates on 24 VDC, offering flexible serial communication through RS-232, RS-422, and RS-485 ports. Though discontinued, the HMI04BU remains widely used in legacy applications for its reliable functionality, intuitive configuration, and integration support with Eaton PLCs and third-party control systems.
Key Features:
- 3.8″ Monochrome Touchscreen: Compact analog resistive display with 320×240 pixel resolution for clear visual feedback and control in tight panel spaces.
- Multi-Port Serial Communication: Supports RS-232, RS-422, and RS-485 protocols, ensuring compatibility with a wide range of PLCs and industrial devices.
- Advanced Interface Functions: Built-in capabilities include alarm/event logging, data trending, recipe management, password levels, macro execution, and USB support for printing and data transfer.
- 24 VDC Power Input: Operates on a low-voltage DC supply (19.2–28.8 VDC), with natural air cooling for safe cabinet integration.
- Lightweight and Compact: Weighs approximately 0.5 lb and fits into small enclosures—ideal for OEMs and compact control systems.
- Discontinued but Supported: While no longer manufactured by Eaton, the HMI04BU remains available through industrial surplus suppliers and repair providers.
- Panel-Mount Design: Easily mounts into standard control cabinets and operator stations using panel cutouts, gaskets, and clips.
- Legacy System Integration: Widely used in Eaton and Cutler-Hammer-based control systems, particularly where cost-effective visualization and interaction are needed.
- Durable Performance: Known for its long service life and reliable operation in factory automation, packaging, and OEM equipment.
- Global Use in Legacy Equipment: Found in a wide range of older systems still in operation across industrial manufacturing and infrastructure sectors.
The Eaton HMI04BU operator interface delivers intuitive touchscreen control, flexible serial communication, and robust monitoring features in a compact footprint—making it a dependable solution for supporting legacy industrial automation systems and OEM platforms.
Description
The HMI04BU is part of Eaton’s HMi (PanelMate) series of compact operator interfaces—monochrome, analog touchscreen panels engineered for robust industrial control environments.
Technical Specifications
Condition | New/Never Used Surplus |
---|---|
Brand | Eaton |
Category |
HMI / MMI / OIT
|
Part Number | HMI04BU |
Subcategory | Operator Interface |
Series |
HMi (PanelMate) |
Display Type | LCD Monochrome |
Screen Size |
3.8″
|
Resolution | 320 × 240 pixels (QVGA) |
Power Supply | 24 VDC |
Mounting Type | Panel Mount |
Touchscreen | Analog Resistive |
Communication Ports | RS‑232, RS‑422, RS‑485 |
Functionality | HMI Display, Alarms, Recipes, Logging |
Weight | 0.35 lbs |
Information About HMI04BU
The HMI04BU is part of Eaton’s HMi operator interface family—compact, touchscreen-based control panels designed for reliable monitoring and interaction in industrial automation systems. This 3.8″ monochrome unit supports 320×240 resolution and operates on 24 VDC, offering flexible serial communication through RS-232, RS-422, and RS-485 ports. Though discontinued, the HMI04BU remains widely used in legacy applications for its reliable functionality, intuitive configuration, and integration support with Eaton PLCs and third-party control systems.
Key Features:
- 3.8″ Monochrome Touchscreen: Compact analog resistive display with 320×240 pixel resolution for clear visual feedback and control in tight panel spaces.
- Multi-Port Serial Communication: Supports RS-232, RS-422, and RS-485 protocols, ensuring compatibility with a wide range of PLCs and industrial devices.
- Advanced Interface Functions: Built-in capabilities include alarm/event logging, data trending, recipe management, password levels, macro execution, and USB support for printing and data transfer.
- 24 VDC Power Input: Operates on a low-voltage DC supply (19.2–28.8 VDC), with natural air cooling for safe cabinet integration.
- Lightweight and Compact: Weighs approximately 0.5 lb and fits into small enclosures—ideal for OEMs and compact control systems.
- Discontinued but Supported: While no longer manufactured by Eaton, the HMI04BU remains available through industrial surplus suppliers and repair providers.
- Panel-Mount Design: Easily mounts into standard control cabinets and operator stations using panel cutouts, gaskets, and clips.
- Legacy System Integration: Widely used in Eaton and Cutler-Hammer-based control systems, particularly where cost-effective visualization and interaction are needed.
- Durable Performance: Known for its long service life and reliable operation in factory automation, packaging, and OEM equipment.
- Global Use in Legacy Equipment: Found in a wide range of older systems still in operation across industrial manufacturing and infrastructure sectors.
The Eaton HMI04BU operator interface delivers intuitive touchscreen control, flexible serial communication, and robust monitoring features in a compact footprint—making it a dependable solution for supporting legacy industrial automation systems and OEM platforms.



