An HMI upgrade modernizes the screens operators use to run a machine, test station or process. Old HMIs often run on obsolete PCs or panels, show cluttered screens that make problems hard to spot, and are difficult to change. Upgrading the HMI can improve operator response, reduce errors and remove an obsolescence risk, often without touching the control logic underneath. This article covers when to upgrade, what good HMI design looks like and how to make the change safely.
Signs an HMI needs upgrading
- The panel or PC is obsolete, or spares are gone
- The HMI software is unsupported or won’t run on a current operating system
- Screens are cluttered, inconsistent or hard to read at a glance
- Alarms flood the screen, and important ones get missed
- Adding a product, recipe or report is slow or impossible
- Operators rely on workarounds and tribal knowledge
What a modern HMI should do
These ideas come from established practice for high-performance HMIs and alarm management, such as the ISA-101 and ISA-18.2 standards: gray backgrounds, color reserved for abnormal states, a clear screen hierarchy and alarms that require action.
HMI upgrade options
| Option | What it involves | Best when |
|---|---|---|
| Re-host | Move the existing HMI to new hardware or a current OS with minimal changes | The screens work and only the platform is obsolete |
| Redesign on the same platform | Rebuild screens and alarms with modern design practices | The platform is fine but the screens are the problem |
| Migrate to a new HMI or SCADA package | Recreate the HMI in a current commercial product | A standard package fits and long-term support matters |
| Custom HMI software | Build a purpose-made interface in LabVIEW, C# or similar | The machine or test needs functions a package cannot provide |
HMI software development: custom or package?
Commercial HMI and SCADA packages are a good fit for standard process and machine control. Custom HMI software, built in LabVIEW, C#/.NET or similar, makes sense when the interface is tightly tied to test sequences, image analysis, data acquisition or unusual hardware. Many Sciotex systems use custom HMIs for exactly that reason. See custom vs off-the-shelf manufacturing software.
How to upgrade an HMI safely
The control logic underneath often stays the same. When it doesn’t, see the industrial software modernization guide.
Frequently asked questions
Modernizing the human-machine interface operators use to run a machine or process: new hardware or software, redesigned screens and alarms, or migration to a current HMI or SCADA package.
When the panel or PC is obsolete, the software is unsupported, screens are cluttered or alarms are missed, or adding products and reports has become slow or impossible.
Not usually. Many HMI upgrades keep the existing control logic and replace only the interface layer, though obsolete controllers are often addressed in the same project.
An HMI designed so abnormal conditions stand out: muted colors for normal states, color reserved for problems, a clear screen hierarchy and prioritized alarms, as described in the ISA-101 standard.
