A ten-inch screen glows on the cabinet door, process values and the alarm banner on it. What that screen runs on usually appears on the quotation as four words: industrial panel PC. Three questions arrive once the customer's IT team walks in: which build, who owns the licence, and who reinstalls it three years from now. None of them gets an answer on site.
Selecting an industrial panel PC rarely starts with the screen. It starts with whether the system behind that screen can still hold the software that has to run on it.
One engineer once designed a small-form-factor case from scratch, built around a low-profile graphics card and a 500 W power supply, and carried it all the way from drawings, machining and tolerances to shipping finished units. The trouble did not arrive on the day it worked; it arrived after two component generations, when the case, the power delivery and the cooling all had to be redone. A panel PC has the same structure: tied to one specific version and one specific licence, the next change stops being a software change and becomes a whole-machine change.
This step sets the platform, and it comes before clock speed. The practical move is to list the software to be installed: the HMI project, the SCADA runtime, the PLC programming tool, the reporting utility, the driver that wants a hardware dongle. If one or two items on that list require Windows, the platform has to be x86. ARM units cannot run Windows, and existing project files will not open on them.
The USR-EC100, EC300 and EC500 sit on that side of the line and ship with Windows preinstalled. The USR-EC100 comes with a J6412 processor, 8 GB of memory, 128 GB of storage, two serial ports, two Gigabit Ethernet ports and two HDMI outputs. Where more I/O is needed, the EC300 steps up: an i5-7200U, six serial ports with two of them switchable between RS232, RS485 and RS422, two Gigabit Ethernet ports, HDMI plus VGA for dual displays, and DC 12 to 36 V input, so a cabinet already carrying 24 V DC can feed the machine directly.
Where the screen only has to show values, change setpoints and list alarms, and no legacy Windows project has to be moved, an ARM-based panel PC takes less room. The USR-SH800 is a 10.1-inch touch panel PC on an ARM Cortex-A55 platform with 4 GB of memory and 32 GB of eMMC, running Ubuntu with WukongEdge, Node-RED and Docker on board. Its I/O covers two RS485 ports, two RS232 ports, two Ethernet ports and USB, which puts acquisition and the local screen into one enclosure and leaves no reason to reserve cabinet space for a separate industrial computer.
One sentence settles it: does an existing Windows project file have to open behind that screen? If it does, x86. If it does not, an ARM panel PC is enough.
Windows on a machine and Windows on an office desk are two different things. A long-term servicing build receives security updates only, no feature updates, and whether an update is installed is the device owner's call. A general-purpose build pushes feature updates in the background and restarts on its own once they land. The lockdown features belong to the same layer: write filters that discard all writes on reboot, a shell launcher that boots straight into the application, blocked key combinations and USB storage, and an allowlist limiting what can run. Every long-term servicing build carries a ten-year support window, and the licence travels with the device.
PUSR x86 models are listed as shipping with Windows and Linux optional, without the build number broken down further. Four items therefore belong on the purchase enquiry in writing: the edition and build number, who holds the licence, who controls the update policy, and where the image archive lives.
An integrated unit is straightforwardly easier: one less device, one less power feed, one less cable run, one less item on the acceptance list. Where the screen does nothing but act as an operator panel, integrated wins.
Split configurations suit other cases: the screen has to drop into a cut-out the customer has already made and the size may still change; one workstation needs two screens; the screen counts as a wear item and should be replaceable on its own. In those, the computer stays in the cabinet and only one half moves when something changes. The way to decide: list every change the screen might undergo. Changes landing on the screen point to a split unit; changes landing on the computer point to an integrated one.
The explainer pages that rank for fanless industrial PCs build their case on the fan being the only moving part, on heat leaving through the metal enclosure by passive conduction, on five environment types from dust to washdown lines, and on five self-check questions, with a comparison table stating outright that fanless models cap out at lower computing power, before moving on to IP65 and NEMA 4X. All of that answers whether the machine survives on site. It is the necessary half.
The parts left unanswered are exactly where purchasing stalls: which operating system the HMI software recognises, who decides the Windows version and update timing, whether screen and computer are one unit or two, and whether the I/O still lines up after a model is discontinued. PUSR's answer on that side: the platform follows the software list, with the Windows and Ubuntu lines each stating what they can run; version and licence go onto the enquiry form instead of being assumed; I/O is copied from the on-site device list with one spare step of headroom, switchable serial ports preferred; and the series keeps interchangeable tiers so a spare unit can be flashed with the same image on acceptance day.
Operator screen beside the equipment, no Windows project to move: the USR-SH800, 10.1-inch touchscreen, ARM with Ubuntu, two RS485 ports, two RS232 ports, two Ethernet ports and USB, covering acquisition and the local screen in one unit.
Windows HMI or SCADA client, modest point count: the EC100, J6412, 8 GB of memory, 128 GB of storage, two serial ports, two Ethernet ports, two HDMI outputs.
Windows, plus many serial devices and several network segments: the EC300, i5-7200U, six serial ports including two switchable, two Gigabit Ethernet ports, HDMI plus VGA, DC 12 to 36 V from cabinet power.
Running those three questions in order, which operating system the software needs, who owns the Windows build and licence, and whether screen and computer split, beats comparing clock speed and screen size first. Getting the first group wrong means replacing the whole machine; getting the second wrong only costs some budget. The day an industrial panel PC is chosen, what is really being decided is not the screen but whether the system behind it will still be usable five years from now.
1. What is the difference between an industrial panel PC and an industrial computer plus a monitor?
An industrial panel PC puts computer and screen into one enclosure: one position in the cabinet, one cable set. The other arrangement puts the computer in the cabinet and the screen on the door, so a broken screen or a size change means replacing one half only. Integrated is easier where the screen acts as an operator panel; split is more flexible where screen specifications may still change, where two screens are needed, or where the panel has to fit an existing cut-out.
2. Does a panel PC have to run Windows?
No. An existing Windows HMI project, a SCADA client that ships only for Windows, or a driver tied to a hardware dongle forces the x86 platform. Where the job is data acquisition, a local screen, touch operation and reporting to a platform, an ARM platform with Ubuntu and a local configuration tool does the work, at lower power draw and in less space.
3. How is Windows IoT Enterprise LTSC different from regular Windows?
The long-term servicing channel delivers security updates only, no feature updates, and installation is the device owner's decision; the general-purpose version pushes feature updates in the background and restarts itself. The former also carries a set of lockdown features: write filters, a shell launcher that boots into a designated application, blocked key combinations, and an allowlist for runnable programs. Each long-term servicing build has a ten-year support window, and the exact end date is published in Microsoft's lifecycle documentation for that version.
4. Can an existing Windows HMI project be moved straight onto a new panel PC?
Usually yes on the same architecture and the same operating system version, never across architectures: ARM units cannot run Windows, and the project file will not open. Before moving, copy down three things: the four serial parameters, the Modbus station numbers and register map, and the tag list. Missing any one of them means testing values on site, and anything found that way has to be checked again.
5. Capacitive or resistive touchscreen?
Projected capacitive suits thin gloves and multi-touch gestures, and the glass surface resists scratching. Resistive suits thick gloves, a stylus or any object at hand, with a softer surface and slightly lower light transmission. Where the screen goes into a cold room or a high-humidity position, ask whether optical bonding is included, otherwise the layers fog up.
6. The panel PC mounts on a cabinet door. How should the temperature rating be read?
The number on the datasheet refers to the air around the device. Air temperature on the inside of a door also takes in heat from the backlight and the computer, and it peaks on summer afternoons. The practical move is to measure two points during the hottest period of the year: air temperature at the height of the device air intake, and the enclosure surface temperature, leaving more than twenty degrees Celsius of margin below the stated upper limit. When the margin closes, relocate the unit or improve ventilation before changing the model.
7. Is a fanless panel PC fast enough?
Fanless designs hand their heat to the metal enclosure, and there is a ceiling on how much power a given volume can carry away continuously, so higher-computing models generally need external fins or active cooling. HMI screens, SCADA clients and historical data logging sit inside the comfortable range for fanless designs; machine vision and multiple streams of video analysis are what push past it. The way to check: run the real project on a development machine, record processor and memory load during the busiest phase, and add thirty percent.
8. How long does a panel PC last, and what happens when the model is discontinued?
Seven or eight years of service from the machine itself is common, while the screen and the computing section move faster. Write the supply period into the enquiry and keep two or three interchangeable tiers from the same series. Flash the spare unit with the same image on acceptance day and actually perform the swap once: an image never tested is no image at all. Archive images, parameters and firmware versions by site identifier and date, so a model change becomes a matter of filling in the same fields.
