UniOP ePAD32B/ePAD33B/ePAD33BT Industrial HMI

UniOP ePAD32B, ePAD33B, and ePAD33BT High end Human Computer Interface: From Technical Features to Engineering Practice

In the field of industrial automation, the performance of human-machine interface (HMI) directly determines the interaction efficiency and data visualization depth between operators and control systems. When the application scenarios upgrade from simple parameter display and button input to complex graphic monitoring, trend analysis, video integration, and high-resolution vector graphics, entry-level text screens or monochrome small-sized HMIs become inadequate. The ePAD32B, ePAD33B, and ePAD33BT launched by UniOP are product lines aimed at this high-end demand. They adopt a flat industrial design with aluminum bezels, which is both sturdy and durable, and has a modern aesthetic. Among them, ePAD32B is equipped with a 9.6-inch VGA monochrome display screen, while ePAD33B and ePAD33BT are equipped with a 10.4-inch TFT color display screen, supporting 64K colors and 640 × 480 pixel resolution, and ePAD33B BT additionally provides a resistive touch screen. The entire series supports optional fieldbus and Ethernet modules, video input options (ePAD33B/BT), 32MB internal user memory, and all software functions of the UniOP platform. This article will provide a comprehensive and in-depth technical analysis of the ePAD3xB series from the aspects of hardware architecture, display technology, communication expansion, core software functions, installation size, on-site troubleshooting, and replacement selection, providing engineers with an authoritative engineering reference.

Product positioning and model comparison

EPAD32B, ePAD33B, and ePAD33BT are high-end human-machine interface products in the UniOP family, positioned in complex application scenarios that require high-resolution, large-sized displays, and rich interactive capabilities, such as:

Multi parameter process monitoring (chemical plants, pharmaceutical reactors)

High precision motion control interface (CNC machine tool, robot teaching)

Video assisted operation (remote monitoring, security integration)

Complex trend analysis and data recording (environmental testing chamber, energy management)

The core differences among the three models are as follows:

Features ePAD32B ePAD33B ePAD33BT

Screen size 9.6 inches 10.4 inches 10.4 inches

Display Type Monochrome LCD TFT Color TFT Color

Color Monochrome (Grayscale) 64K Color 64K Color

Resolution 640 × 480 VGA 640 × 480 VGA 640 × 480 VGA

Touch screen without resistance touch screen

Complete physical keyboard, complete physical keyboard, complete physical keyboard+touch

The video input option is not supported and is supported

User Memory 32 MB 32 MB 32 MB 32 MB

Ordering suffix -0050-0050-0050

EPAD32B provides high-resolution monochrome display, suitable for occasions that do not require color but require fine graphics and long-lasting backlighting (such as outdoor strong light environments). EPAD33B is designed for standard industrial monitoring that requires color interfaces, analog instruments, and trend curves. EPAD33B adds a touch screen on the basis of ePAD33B, achieving a dual interaction between physical buttons and touch operations, greatly improving the flexibility of operations.

Analysis of Hardware Technical Parameters

2.1 Display and Resolution

EPAD32B: 9.6-inch monochrome LCD, VGA resolution 640 × 480. Although it is monochrome, the high pixel density makes graphics, text, and bar charts very clear and has excellent sunlight readability.

EPAD33B/ePAD33BT: 10.4-inch TFT color LCD, also 640 × 480 VGA, supports 64K colors (i.e. 16 bit color depth, can display 65536 colors). This number of colors is sufficient to present realistic device icons, alarm level differentiation (such as red for emergency and yellow for warning), and trend curves.

Both display screens support vector graphic capabilities, including advanced effects such as multi-layer graphic overlay and object transparency. In addition, ePAD33B and ePAD33BT also support analog gauge objects, which can be used to display analog quantities such as pressure and speed, with visual effects similar to traditional dashboards.

2.2 Physical Interaction

Physical keyboard: All three models are equipped with a complete industrial keyboard, including numeric keys, directional keys, function keys, etc. The aluminum alloy frame not only enhances the appearance texture, but also strengthens the impact resistance.

Touch screen (ePAD33BT only): Resistive touch screen, glove operated, high precision, suitable for frequent touch scenes. The coexistence of touch screen and physical keyboard allows operators to choose interaction methods based on preferences or task requirements.

2.3 Memory and Storage

User memory: 32 MB internal Flash (non-volatile), used to store engineering files, recipe data, trend records, and alarm history. Compared to the entry-level ePAD series (512KB or 8MB), the 32MB capacity can support complex projects containing hundreds of images, high-resolution bitmaps, multilingual text, and long-term trend data.

Formula storage: Through software configuration, formula data can be stored in user memory and transmitted to the upper computer via Ethernet.

2.4 Power Supply and Electrical

Supply voltage: 24 VDC (typical industrial standard)

Power consumption: Specific values are not provided in the original text, but reference is made to similar products with a power consumption of approximately 15-25W.

Protection level: IP65 front panel (dustproof and waterproof), suitable for humid or dusty environments.

Working temperature: The original text did not provide a detailed range, but universal UniOP products typically range from 0 to 50 ℃, with optional wide temperature models available (specific ordering information needs to be checked).

2.5 Backlight lifespan

The document mentions that 'the lamp lifetime is the typical value for continuous operation at 25 ℃', and the LED backlight lifespan of TFT screens is usually over 50000 hours (approximately 5.7 years of continuous use).

Communication and networking capabilities

3.1 Built in communication port

The ePAD3xB series provides at least one multi protocol PLC port, which can be configured through software as RS-232, RS-422, or RS-485, and supports over 130 industrial communication drivers. In addition, it is equipped with an Aux auxiliary port for connecting optional modules.

3.2 Dual Drive Communication Capability

Similar to ePAD05, the entire series supports Dual driver communication capability, which means HMI can communicate with devices of two different protocols simultaneously. For example, one port is used to connect to a Modbus RTU frequency converter, while the other port (via an Ethernet module) is used for TCP/IP communication with the Siemens S7-1200.

3.3 Optional fieldbus and Ethernet modules

Through the Aux port, users can insert the following optional modules:

Fieldbus modules: Profibus DP, CANopen, DeviceNet, Interbus

Ethernet module: Supports TCP/IP and has the following functions:

Connect PLC or remote I/O with Ethernet interface

Download/upload projects directly from UniOP Designer via Ethernet

Send alarm, event, trend data, and recipe data to the upper computer or SCADA system

Build UniNET network (UniOP HMI data sharing network based on Ethernet, and provide OPC Server)

3.4 Video Input Options (ePAD33B and ePAD33BT only)

This is an important differentiating feature of the ePAD3xB series compared to other UniOP products. Through a dedicated video input module, HMI can receive composite video signals (such as analog outputs from CCTV cameras, industrial endoscopes, and machine vision systems). The video footage can be displayed in real-time within a window on the HMI screen, making it convenient for operators to monitor the equipment's operating status while observing physical processes (such as checking whether the mixing blade is rotating and whether the material is in place). This function has extremely high practical value in fields such as food processing, packaging machinery, and remote inspection.

3.5 UniNET Network

The Server and Client modes that support the UniNET protocol enable data sharing between multiple UniOP HMIs, or exchange data with upper computer software such as Wonderware and WinCC through UniNET OPC Server.

Deep analysis of software functions

The ePAD3xB series uses UniOP Designer 6 software for engineering configuration, with extremely rich software functions that far exceed those of door level products.

4.1 Data Collection and Trend Display

Support displaying analog data (temperature, pressure, flow rate) in the form of real-time trend curves and historical trend curves.

Trend data can be stored in 32MB of user memory and periodically uploaded to the upper computer or database via Ethernet for long-term data analysis.

Multiple curves of different colors can be displayed on the same screen, supporting interactions such as zooming and cursor reading.

4.2 Vector Graphics and Animation

Support vector graphic objects (lines, rectangles, circles, ellipses, polygons) that can be infinitely scaled without distortion.

Support multi-layer graphic overlay and object transparency, achieving semi transparent overlay effect (such as overlaying semi transparent alarm windows on background images).

Dynamic graphic objects can change color, position, size, or visibility based on variable values.

Analog gauge objects make analog display more intuitive, supporting custom scales, pointer colors, and ranges.

4.3 Alarm and Historical Events

Number of alarms: No specific upper limit, determined by memory, usually supporting thousands of alarms.

Historical alarm list: automatically records the occurrence, confirmation, and recovery time of alarms.

Event List: Record operator actions (parameter modification, screen switching) and system events.

Alarm and event information can be sent to remote printers or upper computers via Ethernet.

4.4 Formula Data Storage

Formula data can be stored in 32MB of memory and can be uploaded/downloaded to the upper computer via Ethernet for backup or analysis.

The operator can select the recipe number through the keyboard or touch screen, download it to the PLC with one click, or save the current value of the PLC as the recipe.

4.5 Multilingualism and Unicode

Supports multi language runtime switching, with the number of languages limited only by memory.

All text can be exported in Unicode format for easy localization using professional translation tools.

Due to its resolution of 640 × 480, it can clearly display complex character shapes (Chinese, Japanese, Cyrillic letters, etc.).

4.6 Macro Editor

Powerful macro scripting languages can be used for:

Touch screen gesture response (such as clicking, long pressing, sliding)

Data verification and conversion

Condition triggered screen jump

Non standard communication with PLC (sending custom messages through serial port)

4.7 Report Printing

Support outputting alarm lists, recipe data, trend screenshots, etc. through a serial printer. The format of the report can be freely configured (using the report designer in Designer).

4.8 Password Protection

Eight level password protection, which can control different users' access permissions to screens, function keys, system menus, and touch operations.

Installation dimensions and mechanical design

The original text provides Figure 1 (Cutout and front view), but does not list specific numerical values. According to the convention of similar ePAD products, the panel size of ePAD32B/33B/33B is about 280 × 220 mm, the opening size is about 260 × 200 mm, and the installation depth is about 60-70 mm. The aluminum alloy frame design allows the panel to be installed flush on the control cabinet, with a clean and easy to clean appearance. Please refer to the template or official data manual provided with the product for specific hole dimensions.

Common troubleshooting and on-site maintenance

Based on the high-end hardware architecture and on-site application experience of the ePAD3xB series, six typical faults and their handling processes are summarized below. Be sure to disconnect the power before performing any internal operations.

Fault 1: After power on, the screen does not display and the power indicator light does not light up

Possible reasons:

The 24V power supply is not connected or the polarity is reversed.

Internal fuse blown or self recovering fuse activated.

The power module is damaged.

Troubleshooting steps:

Measure the power terminal voltage with a multimeter (should be 24V DC ± 10%).

Disconnect all external devices (PLC wires, modules), keep only the power supply, and power on again. If restored, external short circuit will cause protection.

Check the internal fuse (if any) and replace it with a fuse of the same specification.

If there is still no response, repair or replace.

Fault 2: Touch screen unresponsive (only ePAD33BT)

Possible reasons:

Oil stains, water stains, or foreign objects on the surface of the touch screen may cause misjudgment.

The calibration parameters for the touch screen are missing.

Touch screen controller malfunction or loose wiring.

Troubleshooting steps:

Clean the surface of the touch screen with a soft cloth.

Enter the system menu for touch screen calibration (usually by holding down a function key to power on and enter engineering mode).

If there is still no response after calibration, disassemble the machine and check if the touch screen cable is loose, and re plug it tightly.

If it still doesn't work, the touch screen itself is damaged and needs to be replaced.

Fault 3: Abnormal display color or blurred screen (ePAD33B/BT)

Possible reasons:

Poor contact of LCD cable.

Display parameter settings are incorrect (such as color depth and resolution mismatch).

TFT panel aging or driver circuit malfunction.

Troubleshooting steps:

Check if the target device of the project is correct in Designer, with a color depth set to 64K colors.

Disassemble the machine and unplug the LCD cable again, clean the golden fingers.

Try downloading a simple test project (full screen red, green, blue alternating) to determine if it is a hardware issue.

If the screen still appears blurry, the LCD module needs to be replaced.

Fault 4: Communication interruption or data not refreshing

Possible reasons:

The communication parameters (baud rate, data bits, checksum) do not match the PLC.

Optional bus module was used but not configured correctly.

Ethernet module IP address conflict or network cable failure.

Communication driver selection error (specific model selected incorrectly among over 130 drivers).

Troubleshooting steps:

Verify communication drivers and parameters in Designer to ensure complete consistency with PLC.

If using the Profibus DP module, check if the GSD file is imported and if the station address and baud rate match.

Use the ping command to test Ethernet connectivity and check IP settings.

Use a serial port monitoring tool to capture the messages sent by the HMI and confirm if any request frames have been sent.

Connect HMI and PLC point-to-point (bypassing the bus) to eliminate network interference.

Fault 5: Real time clock power failure reset

Possible reasons:

The internal backup battery (usually CR2032 or CR2430) is depleted. The ePAD3xB series also uses button batteries.

Replacement steps:

Open the back cover after power failure (pay attention to electrostatic protection).

Find the battery holder and remove the old battery.

Install a new battery of the same model (pay attention to polarity).

Power on again and enter the system menu to calibrate the time.

If it is still lost, check the battery socket solder joints or nearby circuits.

Fault 6: Video input without screen (ePAD33B/BT)

Possible reasons:

The video input module is not installed correctly or the driver is not loaded.

Camera or video source malfunction.

Video format mismatch (NTSC vs PAL).

Troubleshooting steps:

Confirm that the video input module is securely inserted into the Aux port and that the video window is enabled in the project.

Connect the camera directly to the TV or monitor and confirm that the video source is working properly.

Switch the video format (NTSC/PAL) in the HMI system settings to match the camera.

Update HMI firmware to the latest version that supports video modules.

Replacement and upgrade path

Path 1: Upgrading within the same series

Upgrading from ePAD32B to ePAD33B: If color display is required on site, it can be directly replaced. The mechanical dimensions and communication interface are compatible, and the engineering files need to be changed to the target device in Designer and recompiled (color configuration may need to be adjusted).

Upgrading from ePAD33B to ePAD33BT: adding touch screen functionality, with the same mechanical size, only touch interaction logic needs to be added to the engineering files.

Path 2: Upgrade from old UniOP products

For users using older VGA screens such as ePAD15 and ePAD20, ePAD3xB provides larger memory (32MB vs a few MB for older models), faster processor, video input options, and richer graphics capabilities. Engineering files can be opened and converted in Designer, but attention should be paid to the differences in macro instructions between the old and new versions.

Path 3: Cross brand replacement

When the ePAD3xB series is discontinued or spare parts are difficult to find, it may be considered to replace it with Siemens HMI Intelligent series (such as TP900), Pro face SP5000 series, or Weintek cMT series. However, it should be noted that:

The communication driver needs to be reconfigured and the communication module may need to be replaced.

The project needs to be completely rewritten, resulting in high migration costs.

The physical keyboard layout may be different, and operators need to be retrained.