HMI Software Development Guide for 2026 – Types, Applications and Benefits

Nowadays, it has become commonplace for machines to do the heavy lifting. Whether you want to communicate with your Roomba, withdraw money from the ATM or monitor factory operations from a tablet, it feels easy and intuitive.

It is especially relevant in Industry 5.0, where smart factories and interconnected devices rely on seamless communication. But who is working behind the scenes?

It isn’t magic. It is called Human Machine Interface (HMI) and it is the silent guardian behind every interaction between a human and a machine.

What_is_HMI_in_software?

Human Machine Interface (HMI) acts as a translator that perfectly understands what the human needs and instantly responds to it. Many HMIs appear as Graphical User Interfaces (GUIs) displayed on devices such as tablets, smartphones, PC monitors or AR/VR headsets.

HMIs are used to monitor, control and analyze industrial, machine and infrastructure processes by displaying machine status, pressure, temperature, production speed, volume, tension, liquid flow rate, etc.

The key elements of human-machine interaction include OS, programming software and communication protocols (Modbus TCP/IP is the most widely used protocol). These allow HMI to connect with a controller, typically a PLC (Programmable Logic Controller) or an embedded controller.

Imagine the user touches the HMI screen and requests an action or enters new input data. What happens next? The HMI sends the request to a controller. In the blink of an eye, the controller processes the request and commands the machine to perform the action. HMI keeps the human in the loop by always updating the performed action on the GUI screen.

Types of HMI software

Depending on their hardware architecture, Human Machine Interfaces can be classified as hardware-based and software-based. In reality, all HMIs need both hardware and software. This is a classification based on how the HMI is delivered, installed and maintained.

Hardware-based HMI

Hardware-based HMIs are the real soldiers in the industrial field. Equipped with a “bulletproof vest” in the form of touchscreens that withstand harsh conditions (e.g., dust, vibrations, oil leakage), they can operate 24/7 and never get tired. Types include:

• Embedded HMI: The most common purpose-built interface integrated directly into the equipment. They require a PLC to control that machine. The display is part of the product itself; removing it may prevent the machine from functioning.

They are applied e.g., in industrial automation, medical devices and automotive dashboards.

• Standalone HMI: All-in-one unit that operates independently. Thanks to built-in logic and embedded controllers, it can operate without a If disconnected, the machine may continue running automatically, but monitoring is lost.

They are applied, e.g., in production line monitoring systems or HVAC control panels.

Software-based HMI

Software-based HMIs act like centralized command systems. Instead of rugged touchscreens bolted to machines, they run as digital applications on PCs, tablets, smartphones. This means flexibility. But it is also a trap. Types include:

• Desktop HMI (PC-based HMI): Installed directly on an industrial PC or standard PC that runs on operating systems like Windows or Linux. Direct connection to controllers via industrial protocols (Modbus, OPC UA, TCP/IP). Thanks to flexible data connectivity, they support centralized and decentralized visualization systems. But it is tied to one particular location. If you walk away, you lose sight of the process.

Example: airport check-in kiosks, CNC machine operator panels

• Web-based HMI: Accessed via web browser. HTML5/JavaScript is used for front-end, HTTP for configuration and WebSocket for real-time data. Off-site management is possible. But it is network-dependent. If the network fails, real-time data can’t be seen and input commands can’t be sent.

Example: factory production dashboard accessed from a manager’s laptop

• Mobile HMI: Accessed via smartphones, tablets or handheld operator devices. Communication is handled by HTTP/WebSocket. Remote monitoring from anywhere. However, a lost device or a connection to an unsecured Wi-Fi network can expose a production plant. Without strict authentication, encryption and device management, mobile HMIs are a vulnerability, not a benefit.

Example: warehouse operator scanning barcodes with a handheld terminal

• Cloud-based HMI: Instead of running on a local panel or on-site computer, the HMI application is hosted in cloud environments such as AWS, Azure or Google Cloud. Communication is handled through HTTP/WebSocket. It is network-dependant. If the network fails, the operator loses control unless the system includes local caching or fallback modes.

Example: Factory supervisor checking production dashboards on a tablet at home

HMI software across industries: applications

The application of Human Machine Interface (HMI) spans across various industries. Whether the need is for surgical precision in robot-assisted operations, interactive engagement in education or controlling production lines in industrial manufacturing, HMI software is there.

Below, you can find out how HMI programming is integrated into various sectors:

Healthcare:

• Patient monitoring and diagnostics: HMI displays real-time vitals (e.g., blood pressure, heart rate, oxygen saturation). Also, it provides the visual interface of the EHR (Electronic Health Record) software.

Example: bedside patient monitors in Intensive Care Units (ICUs) and Operating Rooms (ORs), Magnetic Resonance Imaging (MRI) displays or X-ray displays

• Wearable health monitors: HMIs are part of the IoT ecosystem. They are either attached to the skin surface (straps, watches) or implanted under the skin. HMI displays real-time vitals, tracks trends and provides them to healthcare providers.

Example: Libre Free sensor for diabetic patients enabling 24-hour monitoring of glucose levels and transmitting data to the Libre App on smartphones

• Surgical systems: In robot-assisted laparoscopic surgery, HMIs provide 3D HD visualizations that guide surgeons with enhanced precision. HMIs can be either head-mounted (HUD) or integrated into a surgeon’s console.

Example: HMI screen in the Da Vinci robotic surgical system

Education:

• Classroom interaction and engagement: HMI screens act as funnier teachers, teaching educative games and serving as A 4K camera enables interaction thanks to the movements of the whole body.

Example: Prowise Move system enabling embodied learning

• Management of smart campuses: HMI is a touch panel in the Integrated Operations Centre (IOC). It is a 3D digital twin of the whole campus, built from live CCTV feeds, IoT sensors and LiDAR scans of every building. The superhero monitoring campus infrastructure is called SCADA (Supervisory Control and Data Acquisition).

Example: Huawei Smart Campus Solution Service

Energy sector

• Grid monitoring: HMIs supervise wind turbines or solar panel arrays by measuring wind speed, power output, temperature, etc. Thanks to Geographical Information System (GIS) integration, operators can see wind turbines/solar panels scattered across the region.

Example: RWE’s renewable energy control center in Germany, where operators oversee over 1,000 wind turbines across Europe from a single GIS-integrated HMI workstation

Manufacturing

• Automotive assembly lines: In automotive manufacturing plants, HMI panels are used to control welding robots, conveyors, and quality-testing stations. MES (Manufacturing Execution System) integration enables the HMI to display orders, product configurations and task instructions at the workstation.

Example: HMIs in Toyota Production System enabling not only SCADA-based visualization and control but also predictive maintenance

HMI and SCADA: What’s the difference?

SCADA (Supervisory Control and Data Acquisition) is like Air Traffic Control (ATC) for various processes, while HMI is just one radar screen.

A SCADA system includes both RTUs (Remote Terminal Units), PLCs and a centralized control unit that includes the HMI. SCADA is applied for data acquisition, real-time monitoring, process control and historical data management.

HMI is the graphical interface that visualizes that data. It allows the operator to interact with the machine and control a particular process locally.

A SCADA system always contains an HMI, but an HMI alone is not a SCADA system.

Benefits of HMI development

• Enhanced operational efficiency: HMIs integrate data from various PLCs and IoT sensors enabling operators to quickly start/stop processes or adjust machine levels.
• Human error reduction: HMIs act as a safety net for human short attention span and fatigue by presenting only relevant information at the right moment. Advanced HMIs use automation and MLOps (Machine Learning Operations) to ensure operational parameters are not hazardous.
• High return on investment (ROI): Enhanced machine reliability brings silken-smooth industrial processes. Even when custom solutions are designed, software development costs are compensated by reduced downtime and lower maintenance processes.
• Predictive maintenance: HMIs can predict problems by being integrated with MLOps and AI. Thanks to color-coded notifications of the machine (e.g., dark blue/green for live data, red for alarms and green for warnings), the operator can spot danger before it becomes critical.
• Data logging and traceability: In case of any failure, there is a “black-box” that collects alarm logs and configuration settings from PLCs. It keeps it in non-volatile memory (NVM) or external storage for future traceability of what had happened.

FAQ

How do you ensure the usability and safety of HMI software in complex systems?

Ensuring the usability and safety of HMI software involves applying human-centered design principles. User-friendly design, no hidden modes, consistent coloring, explicit confirmation for irreversible commands and alarm prioritization all play a significant role. A safe HMI supports decision-making under stress and remains predictable during failures.

How does HMI software enhance real-time monitoring and control in manufacturing?

HMI software enhances real-time monitoring and control in manufacturing by collecting data from thousands of PLCs, RTUs, controllers and drives on a unified interface. It can also display historical trends, diagnostics and event logs, enabling traceability of past failures.

How does HMI software improves user interaction with industrial machines?

HMI software improves user interaction by providing intuitive controls, visual feedback, contextual information and guided workflows. Some modern industrial machines offer gesture recognition, haptic feedback and voice commands. It improves user engagement and accelerates the workflows.

What are the benefits of custom HMI software over off-the-shelf solutions?

Custom HMI software offers better integration with complex architecture by being tailor-made to your machine logic and user operations. For high-risk complex systems, custom HMI software can better prevent cybersecurity threats. However, developing a custom HMI requires a dedicated software development team.

What programming languages are used in HMI software development?

HMI software is typically developed using multiple programming languages across different system layers. Low-level and performance-critical components are often written in C or C++, application and desktop interface layers commonly use C#, scripting and data-processing tasks may use Python and modern web-based HMIs rely on JavaScript, HTML, and CSS.