In the world of industrial automation, the way people interact with machines is more important than ever. Today, Human-Machine Interfaces (HMIs) offer a user-friendly, interactive way to control and monitor different aspects of a machine or system—and they’re evolving alongside other industrial technology. 

Let’s take a closer look at what HMIs are, the different types that exist, a few common applications, and what the future of HMIs looks like. 

Why You Can Trust Crescent Electric

Backed by over 100 years of service, we partner with leading suppliers to offer a comprehensive range of industrial supplies and technologies—such as HMIs. Plus, our team of Application Engineers is equipped to help you find the right automation solutions for your business and implement them smoothly. Our team is experienced, knowledgeable, and excited to work with you!   

Want to learn more? Reach out to our Application Engineers today and get on the path to transforming your business. 

What Is a Human-Machine Interface?

As the name suggest, a Human-Machine Interface is a user interface that allows humans to interact with a machine or device. 

Technically, this term can apply to various things you may come across in everyday life: controlling an appliance and using a self-checkout are just two of many examples. However, the term “HMI” is typically reserved for industrial contexts—a touchscreen used to control a programmable logic controller (PLC), for example. 

Difference Between HMI and SCADA

HMI and SCADA are sometimes used interchangeably given that they are related terms; however, they are two distinct concepts. While an HMI is simply the interface used to interact with a machine, SCADA is a type of industrial control system comprised of different hardware and software components—including an HMI.  

The HMI plays a critical role in a SCADA system; it’s where users can analyze the real-time data coming in from the system and use it to make quick decisions. Thus, these terms can be easily confused. 

Types of HMIs

Choosing the right HMI will depend on your application. Let’s look at three common types of HMIs and what each is used for. 

Push Button Replacement

Push button replacement HMIs are the substitute for physical buttons, switches, and other control devices. The HMI touchscreen provides these buttons in one central location, simplifying machine operation and streamlining processes. 

Data Dashboard

Data dashboards are ideal for applications that require constant monitoring. They provide performance information, enable recipe programming, show data trends, and more. Data can typically be displayed visually in graphs and other visual tools. 

Overview

The HMI commonly associated with SCADA is an overview or overseer HMI. This HMI can observe multiple machines or processes from one centralized point. In the case of SCADA, this is where operators access and analyze real-time data and control the system. 

HMI Applications

HMIs are an essential component of industrial automation; therefore, they can be found across all industries. A few examples of HMI use cases include: 

• Controlling production lines, machines, and other equipment during manufacturing 

• Monitoring and controlling fluid levels, valves, pressure, etc. in oil and gas production 

• Providing real-time data dashboards for energy management processes like transmission and grid distribution 

These are just a few of the many ways HMIs are utilized by industrial businesses. Additionally, HMIs are used to control HVAC, lighting, and other systems in commercial buildings. 

The Future of HMIs

As Industry 4.0 and 5.0 continue to transform industrial processes, HMIs are evolving as well. Let’s look a few key developments that could shape the next era of HMI use for industrial businesses. 

AI Integration

Like with most things, artificial intelligence is re-shaping what’s possible with industrial automation. AI-driven HMIs can provide operators with real-time, data-based recommendations to optimize efficiency and improve processes. AI can also utilize data to predict when equipment will require maintenance, which allows operators to be proactive and reduce the risk of costly downtime. 

Multimodal Interfaces

The way users can interact with HMIs is also changing. Input methods such as voice and gesture give operators further flexibility with how they use these devices while paving the way for potential efficiency improvements. 

Augmented Reality (AR)

AR offers significant potential as a secondary HMI that supports users with a variety of tasks. For example, an operator or technician could wear a heads-up display that prompts them with step-by-step instructions on how to perform machine maintenance.   

Final Thoughts

No matter the industry, HMIs serve as the critical bridge between people and machines. They make machine operation easier, safer, and more efficient; provide real-time data and insights; and more, making them an indispensable part of industrial processes. 

If you’re looking to upgrade your HMIs, or have questions about expanding your industrial automation capabilities, get in touch with our Application Engineers today!