An operator panel rarely fails all at once. The touch layer stops responding in one corner, the backlight fades, or the panel no longer starts after a power cut. When it goes, the machine may still run, but nobody can operate it. There are three ways back, and the right one depends less on the panel than on the project file behind it.
What a replacement has to match
- Cutout: the hole in the cabinet door. A different size means metalwork or an adapter plate.
- Screen size and resolution: screens are drawn in pixels. A project made for 800×480 does not simply fill a 1024×600 or 1366×768 display.
- Supply: most panels run on 24 V DC, some on mains voltage.
- Interface and protocol: PROFINET, EtherNet/IP, PROFIBUS or a serial link, matching the controller.
- Software: the configuration software and version the project was built with, and the runtime licence on the panel.
- Front protection: the IP code of the front once mounted, often IP65.
Before anything else, find the project file and note the software version. Without them, every route takes longer.
Same model: the shortest way back
The same ordering code, whether new, new surplus or refurbished, takes the project as it is. Check the firmware or device image on the replacement: some makers require it to match the software version of the project, and changing it may need the original configuration tool. Repair is the other same-model route. Touch layers and backlights are common repairs, and you get your own panel back with its settings.
A successor from the same maker
Makers name successors for their discontinued panels, sometimes with a larger screen for a similar cutout or with an adapter frame. The project usually converts in the maker’s own tool; in TIA Portal, for example, the device in a SIMATIC project can be changed and the screens adapted to the new size. Expect to adjust layouts, check every screen and test alarms and recipes. The guide to finding a replacement part shows where makers publish successors.
Another make: a small project
A panel from another maker needs the screens rebuilt in its own software, the tags mapped to the controller again and the whole interface tested. It is worth it when the old family is out of support and the machine has years ahead of it, or when several machines move to one panel family at once. Budget engineering time, not only the hardware.
How to choose
| Route | Project | Choose it when |
|---|---|---|
| Same model | Loads as it is | The machine has to run today |
| Successor | Converted and checked | The family is discontinued and a planned stop is possible |
| Another make | Rebuilt | The machine has years ahead and the panels are being standardised |
If the machine has to run while a successor is engineered, buy a same-model spare first. Search the full ordering code, or post a wanted request if nobody lists it.