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Introduction
Traditional Human-Machine Interfaces (HMIs) and Industrial PCs are powerful tools, but they do come with their own set of challenges. Extensive setup, complex wiring, and individual logic programming can drive up costs and complicate projects. This can be excessive when all you need is a simple interface to extend access to a specific site.
With Web HMIs, extensive configuration is a thing of the past. Forget about software installations, licensing issues, and driver problems. Choosing a Web HMI can enhance efficiency while boosting security by simplifying the installation process and reducing vulnerabilities.
Maple Systems’ Web HMIs provide the rugged build of an industrial touchscreen with the versatility of a Chromium-based web browser, ensuring reliable access to critical data even in the toughest environments. Read on to learn about the convenience and utility that Web HMIs can provide.
How do Web HMIs work?
To better understand what makes a Web HMI different, let’s first take a look at how a traditional HMI works. In a typical scenario, each HMI in a control system will have its own custom program and may be wired directly to the machinery that it is interacting with. This can make the installation process a tedious affair for systems that employ several HMIs.
The following diagram illustrates a hypothetical setup using traditional HMI panels:
In the diagram above, each HMI connects directly to the plant machinery and the extended network, requiring specific drivers and a custom control program. Adding more HMI panels in this setup significantly increases the complexity of the entire control system.
By contrast, Web HMIs allow for a much simpler configuration, needing only to connect to a web server, which in turn communicates with plant machinery and the rest of the network as shown below:
As you can see, using Web HMIs can result in a more efficient network that requires less hassle to implement and expand. Adding new Web HMIs to this system is trivial compared to the alternative. This is because Web HMIs have a few key differences that make them stand out from their peers:
Client-only device
Web HMIs function solely as client devices, meaning that they rely on a connection to a central server to access services and process data. The Web HMI simply acts as an extension of the server’s interface, connecting to the server over Ethernet to display data and provide a means for operators to send input back to the server.
Server-based operation
In a server-based system, the central server acts as the backbone of the operation, managing all data processing and application management. All software is installed and run on the server, and Operators can then view the feedback data on the Web HMI’s display. This setup can be significantly more efficient due to reduced power consumption and centralized processing.
Web-based applications
A web-based application refers to any program that runs on a server and is accessible via a web browser using HTTP. These applications can range from simple dashboards to complex SCADA system interfaces used to control and monitor extensive industrial processes. Custom web applications may also be employed, allowing for maximum flexibility.
Why use a Web HMI?
Their simplified architecture gives Web HMIs several advantages over other options on the market. Integrating Web HMIs into your project can help you achieve enhanced efficiency, improved security, scalable growth, flexible access, reliability, and energy savings:
Easy installation and maintenance
Streamlined connection: With fewer components and no need for complex wiring, Web HMIs are easily mounted and connected to your existing network infrastructure. Connecting to power and the local network are all you need to do to get online.
User-friendly configuration: Configuring a Web HMI is straightforward. Once the Web HMI’s IP address has been set, simply enter the server’s URL or IP address into the panel’s connection menu and you are ready to go. This plug-and-play approach minimizes downtime and allows for rapid deployment across your facility.
Reduced IT burden: Because Web HMIs rely on web-based applications, there’s no need for extensive software installations or updates on each individual device. Centralized management from the server ensures all panels are always up to date with the latest features and security patches.
Enhanced security
Data protection: By working primarily as access points, Web HMIs do not store sensitive information locally. This design minimizes the risk of data theft in case the physical security of the device is compromised.
Centralized control: With data processing and storage managed on secure servers, administrators can tightly control and consistently enforce network security protocols. This centralized approach allows for comprehensive monitoring, regular security updates, and quick response to potential threats.
Access management: System passwords may be configured for the interface to ensure that only authorized personnel can access critical systems and data.
Scalability
Simple expansion: Adding a new Web HMI is as easy as connecting it to a network and entering the server URL into the connection menu. There’s no need for extensive configuration or additional hardware investments.
Cost-effective growth: This streamlined process enables quick and cost-effective expansion, allowing you to scale your operations with minimal effort. Whether you’re adding one panel or a hundred, the setup process remains efficient and straightforward.
Flexible deployment: Web HMIs are easy to install in various locations across your facility, providing consistent access to essential data and controls. This flexibility supports dynamic and scalable industrial environments.
Energy efficiency
Reduced power usage: Web HMIs typically consume significantly less power than traditional PCs or HMIs. Leaving all the heavy lifting to a central server means that the Web HMIs within the network do not consume nearly as much power as a traditional interface solution. This reduction in energy usage can lead to substantial savings, especially in large-scale industrial facilities.
Lower operating costs: Energy-efficient Web HMIs help lower overall operating costs by reducing electricity consumption and cooling requirements. This is particularly important in environments where multiple devices are in continuous operation.
Environmental benefits: By lowering power consumption, Web HMIs contribute to a more sustainable operation, aligning with green initiatives and reducing the facility’s carbon footprint.
Remote access
On-site and off-site access: Operators and managers can connect either to a local server within their facility or use a VPN service to securely access a remote server at another location.
Real-time monitoring: Remote access ensures that critical production information is available in real-time, enabling swift responses to any changes in operational status. This is particularly beneficial for facilities with multiple locations or for managers who need to oversee operations from different sites.
Rugged design
Durable construction: Designed to withstand the rigors of harsh industrial settings, including exposure to dust, moisture, and extreme temperatures. Web HMIs’ durable construction ensures longevity and reliable performance even in the toughest conditions.
Responsive interfaces: Featuring high-quality touchscreens, Web HMIs offer responsive and intuitive interfaces that are easy to use, even with gloved hands. This makes them ideal for factory floors and other demanding operational areas.
Industry certifications: Web HMIs may be certified to work in challenging environments, such as Class I, Div 2 areas, ensuring compliance with industry standards and safety regulations.
By leveraging the processing power of a centralized server, Web HMIs present a streamlined approach that can cut down development and installation time, while increasing overall efficiency across your control system. Simple wiring also means that installing a new Web HMI requires connections to power and the local network, and nothing more.
Applications
Web HMIs can be added to almost any project in place of a standard HMI, with numerous possible applications. Display visualizations made in CODESYS, AVEVA Edge, or any web-based application with ease. Gain full access to a remote desktop running on a PC, or even a Raspberry Pi.
Remote desktop with Raspberry Pi and noVNC
Maple Systems Web HMIs can be used to access a remote desktop environment by pairing them with a device that running a VNC server and noVNC. Follow the link below for a step-by-step guide on setting up a remote desktop connection using a Raspberry Pi and a Maple Systems WP4000 series Web HMI.
Contact us
Would you like to know more? Our friendly and knowledgeable sales team can connect you to the resources you need. For information on pricing, availability, and more, send an email message to sales@maplesystems.com, or contact our team by phone at (425) 745-3229.
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