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Most people are familiar with PCs (Personal Computers), but far fewer understand the difference between a retail PC and a panel PC. Whereas PCs are typically found in offices, panel PCs are specialized units designed to be used on or near machines in industrial environments like plant floors or remote sites. Panel PCs are built specifically to run HMI/SCADA software that allows operators to monitor and control processes in virtually every industry, including food & beverage, oil & gas, automotive, water & wastewater, and many more.
Panel PCs are integrated all-in-one computers encompassing display and computing systems. The displays take the form of touchscreens that can be both capacitive, or multi-touch and resistive, meaning they can be used while wearing gloves. On the latter point, some panel PCs also give the option between projective capacitive (PCAP) and resistive screens. PCAP screens work by maintaining a standing electrical charge across a sensor that extends through a contact surface — in this case a touchscreen — where changes in the electrical charge can be detected by the proximity of a stylus, a finger, or other capacitive bodies. As far as performance is concerned, PCAP offers much higher viewability, brightness, and reliability. Resistive, in contrast, is more valuable in environments that require operators to wear standard non-specialized gloves, such as remote sites with harsh weather conditions.
Panel PCs are typically more ruggedized than their office-based counterparts and therefore more ideal for long-term use in production environments. Operating at a wide range of temperatures, panel PCs are also measured for IP (Ingress Protection), meaning the enclosure’s effectiveness at blocking dust, moisture, and liquids. Panel PCs have multi-screen capabilities in both portrait and landscape, allowing them to adapt to a variety of industry, plant, and field settings. On top of that, many panel PCs include integrated camera, microphone, and proximity sensor options to consolidate the accessories you might need to purchase, all while ensuring compatibility.
For similar reasons, panel PCs regulate temperature differently than commercial or retail PCs. Office PCs typically use fans to cool down their internal systems. However, fans, as well as any other internal moving parts, are not ideal for industrial environments where dust, wide temperature fluctuations, shocks, and random vibrations are common. To stay cool in these situations, panel PCs utilize fanless heatsink technology. A heatsink is a passive heat exchanger that dissipates heat to regulate overall panel PC temperature.
By now, most people associate touchscreens with battery-powered mobile devices like phones and tablets. While you may not be able to fit it in your pocket like a phone, a panel PC runs on hardwired power to avoid downtime while charging. Panel PCs also offer greater mounting and placement flexibility over commercial PCs because they can be mounted where they’re needed without running wiring to a separate PC.
Space is valuable on the plant floor. Panel PCs are designed to be compact while delivering convenient and easy control. By utilizing a touchscreen instead of a keyboard and mouse, panel PCs eliminate excess wires, the need for clunky tables or rigging, and reduce the overall size of the system.
Panel PCs offer several connectivity options including LAN, I/O (Input and Output), CAN, and cellular, in addition to WiFi. To stay apace with many organizations’ Digital Transformation and Industry 4.0 initiatives, most modern panel PCs include IIoT (Industrial Internet of Things) functionality.
Panel PCs are designed with an emphasis on reliability, high performance, and an overall reduction of system malfunction, and are therefore most often considered a long-term investment, saving money on maintenance and software updates, especially if paired with a software platform like Ignition.
While compatibility testing is often still required for panel PCs, usually it is performed by the manufacturer in advance, so you don’t have to worry about whether the display and the computer will work together.
Operators use panel PCs to interact with HMI/SCADA systems, but the amount of control they have over the processes they are monitoring is proportional to how well their chosen hardware and software complement each other. Ignition is the perfect choice for rapidly developing high-performance HMIs designed to optimize operator efficiency. Installed in minutes on virtually any device, Ignition makes working with HMIs easy, and updating an existing HMI becomes fast and painless.
For a lightweight application designed for remote sites, the combination of a panel PC with Ignition Edge is ideal for capturing, processing, and visualizing critical data at the edge of the network, especially when paired with a low-bandwidth protocol like MQTT.
OnLogic builds panel PCs, along with a whole host of other industrial equipment that combine advanced computing power with a range of hardened displays as well as modular solutions to enable easy customization and simplify upgrading while reducing maintenance costs. OnLogic products pair spectacularly with Ignition and Ignition Edge.
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Desktop monitors are consumer grade monitors that most of the world’s population uses as a display for their computer. An industrial touch screen monitor is basically a desktop monitor that is stripped down to the bare chassis and components with a touch glass overlay integrated to make it easier for Original Engineer Manufacturers (OEMs) to integrate the unit into a larger enclosure. For the most part, an Industrial Touch Screen Monitor is best known as an open frame touch screen monitor or an open frame monitor. The unit itself is a metal chassis that holds the internal components of the monitor, along with the LCD panel together with no housing or bezel. A key component that industrial touch screen monitors have is that all components are made of industrial grade materials and will typically last longer and be much more durable than that of consumer-grade products. With EverGlory(www.everglorytouch.com)’s Industrial Touch Screen Monitors all mechanical dimensions of the unit will remain the same throughout the lifetime of the monitor. In most cases, industrial touch screen monitors have parts that are much easier to replace or repair, if there is a damaged component.
What are Industrial Touchscreen Monitor Applications?
Industrial touch screen monitors are suited for heavy-duty applications that are continuously being used, whether by workers or the public. A few good examples would be CNC machines for industrial applications. In this type of environment, industrial touch screen monitors are always being put to the test to endure harsh operating conditions, where the unit needs to last, otherwise the whole unit will not function. Another example of a harsh environment would be a Kiosk. Often, industrial grade touch screen monitors are integrated into a Kiosk to endure the constant approach of people who will put the Kiosk through lots of abuse. In general, an industrial touch screen monitor is primarily used to integrate into larger enclosures or machines to operate. Industrial touch screen monitors will most likely be used in applications that require a durable monitor that can last a long time and be put through a series of harsh operating conditions.
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This technology is becoming incredibly pervasive, with most cell phones, tablets, ticket vending machines, ATM’s, self-service kiosks and even car GPS systems being operated by touch screen technology. What you’re unlikely to know if you’re not involved in the industry is that there are five different kinds of touch screen technologies and each one boasts a unique suite of functions and benefits, which we shall be exploring in this blog.
The questions we will seek to answer are: what are the different types of touch screens? And which one would best suit the demands of your business or application? An Array Of Touch Screen Technology 5-Wire Resistive, Surface Capacitive, Projected Capacitive, Surface Acoustic Wave (SAW) and Infrared are all different kinds of touch screen technology. Let’s take a closer look at each and their defining characteristics and benefits… 5-Wire Resistive Touch Technology 5-Wire resistive is the most common form of touch technology used today. A resistive touch screen consists of a film screen covered by a glass panel, both of which are layered by a thin metallic sheet with a slim gap between them. When you press the screen with your finger, the two metallic sheets come together and in making contact, an electric current is generated telling the device where the point of contact has been made. The advantage of 5-wire resistive touch technology is that is can be controlled or operated using any object, be it a finger, a pencil, stylus or gloved hand. All that’s needed is a precise point of pressure on the screen. Another benefit of this technology is that it is the least expensive and is low on power consumption. 5-Wire resistive touch screens are also resistant to liquids and surface contaminants, such as moisture, dust, grease and oil. The only negative things to be said for 5-wire resistive technology are that the touch screens tends to offer a lower image quality and the polyester film that covers the screen can be vulnerable to marring and scratching by sharp objects. For You? If you prioritize cost over all other considerations, then 5-wire resistive touch technology is an excellent choice for you.
Surface Capacitive
Surface Capacitive is another commonplace touch technology, which consists of a glass panel beneath a transparent electrode layer beneath a protective screen or cover. Surface Capacitive monitors are activated and controlled by naked skin, as they react to the static electrical capacity of the human body. As such, this touch technology can only be operated by a human finger or by an electrically charged stylus pen. The advantages of Surface Capacitive touch technology is that it offers users a better image quality than 5-wire resistive touch. The screen tends to be more durable and boasts excellent water, grease and dust resistance, as well as a high resistance to scratching. The potential problem with Surface Capacitive is that it requires a bare finger or capacitive stylus in order to be activated, which can be frustrating in environments where hands need to be gloved, such as in medical healthcare facilities or restaurant kitchens, for example. This particular touch technology also tends to be sensitive to Electromagnetic (or Radio Frequency) Interference (EMI/RFI). For You? Surface Capacitive is useful for most applications, except perhaps in environments in which users need to have gloved hands or in which there is a lot of EMI/RFI.
Projected Capacitive Touch Technology
Very similar to Surface Capacitive, Projected Capacitive offers two key benefits over and above its sister technology:
Surface Capacitive touch screens can only be activated by a bare finger or with a charged stylus. Projected Capacitive touch screens can be operated even if the user is wearing thin cotton gloves or surgical gloves. Projected Capacitive touch screens accept simultaneous input from several different sources, a feature called “multi-touch activation”. A Projected Capacitive touch screen consists of an IC chip and a transparent electrode film, which have been embedded in a sheet of glass. This creates a 3D electrostatic field, which is interfered with when a finger comes into contact with the screen, thereby allowing the device to determine the precise location of the touch points. The advantage of Projected Capacitive touch technology is that it supports beautiful image clarity, is resistant to liquids and other surface contaminants, and is even more resistant to nicks and scratches than Surface Capacitive screens. One of the greatest benefits of this touch technology, however, is that it boasts multi-touch function. The only drawbacks is that a Projected Capacitive screen can only be activated by a bare finger, or by fingers clad in surgical gloves or thin cotton gloves. Also it tends to be sensitive to EMI/RFI. For You? Projected Capacitive touch technology overcomes some of the challenges of Surface Capacitive, enabling it to offer solutions in a greater variety of industries, such as the medical healthcare field. This, together with its crystal image clarity and multi-touch function make it perfect for a great suite of applications.
Surface Acoustic Wave (SAW) Touch Technology
Surface Acoustic Wave or SAW touch technology makes use of a series of piezoelectric transducers (devices that convert variations in pressure into an electrical signal) and receivers along the periphery of the screen. This creates an invisible network of ultrasonic waves on the surface of the panel that, when touched, are absorbed at the contact point. This tells the device where the screen has been touched and this data is sent to the computer. The great thing about SAW touch technology is that it is easily activated by anything really, whether it’s bare skin or a heavily gloved finger, which is a benefit it offers over all the other touch technologies discussed thus far. Another advantage of Surface Acoustic Wave screens is that they offer high visibility, excellent image clarity and the best scratch resistance of all. SAW monitors are also exceptionally easy to use, which is why this particular technology is so popular with high-end touch monitor manufacturers. The drawbacks to SAW is that it cannot be operated using hard items such as a fingernail, pen or credit card, although this isn’t much of a disadvantage. Also, the screen has to be kept clean because solid contaminants can create unresponsive areas and water droplets may cause false-triggering, which can be a bit of a pain in moist environments, such as kitchens, restaurants, bars, etc. For You? If you’re looking for top quality touch technology with fantastic image clarity, an accurate touch response and the ability to be activated with both a gloved or ungloved finger, SAW is the one for you! Just keep your monitor clean.
Infrared (IR) Touch Technology
Infrared (IR) monitors make use of IR receivers and emitters to create an invisible network of light beams across the screen. This negates the need for an additional protective layer or screen over the display and the result is the best possible image clarity and quality. When an object comes close to the screen, the infrared light beams become interrupted and the sensors tell the computer the location of the touch point/s. The advantage of infrared (IR) touch technology is that it offers unparalleled light transmission and image quality – the best of all the touch technologies, in fact. It boasts unlimited “touch-life” and is totally impervious to surface scratches. There are a few disadvantages to discuss, however. IR touch technology is highly sensitive, so a build-up of grease, dust or oil on the screen can cause it to malfunction. Additionally, coming too close to the screen can cause the technology to activate. These screens, which are at the top end of the price spectrum, are not water resistant – and in fact won’t operate properly if moisture gets on them – and they may be sensitive to ambient light interference. For You? If your touch screen application takes place outside or in any exposed environment, IR touch technology wouldn’t be the ideal choice. If, however, you require state-of-the-art optical performance and a gorgeous, crystal clear display, and cost isn’t a major concern, IR touch technology could be a great option for you!
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