Hollysys HT8421T
Original price was: $230.00.$155.00Current price is: $155.00.
The Hollysys HT8421T is a compact, high-performance 4.3-inch widescreen HMI from the HT8000 series.1 It is widely used in small-scale automation, particularly in sectors like water treatment, HVAC, and pharmaceutical machinery, where space is limited but a clear graphical interface is required.
1. Display and Visuals
Despite its small physical size, the HT8421T offers high-definition clarity compared to older text-based or low-resolution panels.
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Screen Size: 4.3-inch Widescreen (16:9).2
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Display Type: TFT Color LCD with 65,536 colors.
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Resolution: 3$480 \times 272$ pixels.4
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Backlight: LED with a service life of approximately 30,000 to 50,000 hours.
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Touch Panel: 4-wire high-precision resistive touch screen.
2. Connectivity and Ports
The HT8421T is designed for standard industrial communication:
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COM 1: RS-232 / RS-485 / RS-422 (9-pin D-sub).5 This port is highly versatile and used for the primary connection to a PLC or VFD.
-
USB Client: Micro-USB port used for high-speed project downloads and firmware updates from a PC.6
-
USB Host: Standard USB port for connecting a USB flash drive to perform data logging, recipe transfers, or project backups.7
3. Hardware and Performance
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Processor: 32-bit RISC CPU (typically 400MHz), providing fast boot times and responsive touch feedback.
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Memory: 128 MB Flash for project data and 64 MB DDR RAM for runtime operations.
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RTC: Built-in Real-Time Clock for time-stamping alarms, events, and data logs.
4. Technical Specifications
| Feature | Details |
| Model | HT8421T |
| Input Voltage | 24V DC ($\pm 20\%$) |
| Power Consumption | Low power consumption (approx. 4W to 5W) |
| Protection Rating | IP65 (Front panel) — Dust-tight and resistant to water splashes |
| Operating Temp | 0°C to 50°C |
| Software | HTDesigner |
5. Key Features
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Hollysys PLC Integration: Provides native, high-speed drivers for Hollysys LE/LK series PLCs, making it very easy to import tags and synchronize data.
-
Third-Party Support: Includes a large library of drivers for Siemens, Mitsubishi, Omron, Delta, and Modbus (RTU/ASCII).
-
Data Logging: Capable of recording historical trends and alarm logs, which can be exported to a USB drive in CSV format.
-
Compact Design: Its slim profile and small footprint make it ideal for handheld control boxes or small machine doors.
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Hollysys HT8421T
Original price was: $230.00.$155.00Current price is: $155.00.
The Hollysys HT8421T is a compact, high-performance 4.3-inch widescreen HMI from the HT8000 series.1 It is widely used in small-scale automation, particularly in sectors like water treatment, HVAC, and pharmaceutical machinery, where space is limited but a clear graphical interface is required.
1. Display and Visuals
Despite its small physical size, the HT8421T offers high-definition clarity compared to older text-based or low-resolution panels.
-
Screen Size: 4.3-inch Widescreen (16:9).2
-
Display Type: TFT Color LCD with 65,536 colors.
-
Resolution: 3$480 \times 272$ pixels.4
-
Backlight: LED with a service life of approximately 30,000 to 50,000 hours.
-
Touch Panel: 4-wire high-precision resistive touch screen.
2. Connectivity and Ports
The HT8421T is designed for standard industrial communication:
-
COM 1: RS-232 / RS-485 / RS-422 (9-pin D-sub).5 This port is highly versatile and used for the primary connection to a PLC or VFD.
-
USB Client: Micro-USB port used for high-speed project downloads and firmware updates from a PC.6
-
USB Host: Standard USB port for connecting a USB flash drive to perform data logging, recipe transfers, or project backups.7
3. Hardware and Performance
-
Processor: 32-bit RISC CPU (typically 400MHz), providing fast boot times and responsive touch feedback.
-
Memory: 128 MB Flash for project data and 64 MB DDR RAM for runtime operations.
-
RTC: Built-in Real-Time Clock for time-stamping alarms, events, and data logs.
4. Technical Specifications
| Feature | Details |
| Model | HT8421T |
| Input Voltage | 24V DC ($\pm 20\%$) |
| Power Consumption | Low power consumption (approx. 4W to 5W) |
| Protection Rating | IP65 (Front panel) — Dust-tight and resistant to water splashes |
| Operating Temp | 0°C to 50°C |
| Software | HTDesigner |
5. Key Features
-
Hollysys PLC Integration: Provides native, high-speed drivers for Hollysys LE/LK series PLCs, making it very easy to import tags and synchronize data.
-
Third-Party Support: Includes a large library of drivers for Siemens, Mitsubishi, Omron, Delta, and Modbus (RTU/ASCII).
-
Data Logging: Capable of recording historical trends and alarm logs, which can be exported to a USB drive in CSV format.
-
Compact Design: Its slim profile and small footprint make it ideal for handheld control boxes or small machine doors.
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