Improving the effectiveness of human-machine interfaces (HMIs) by developing a standardized approach to the design of operator interface screens and the content displayed on packaging lines, plus increased access to diagnostic information, has become a priority for a leading packaging industry technology group.
OMAC, the Organization for Machine Automation and Control, has been a key player in the past in championing new technology, including the emergence of standards for servo-driven machines in packaging. And now with the corporate electricity and automation group at Nestlé providing a catalyst for getting a global technology standard put forward, OMAC has started initiatives for HMI standardization, improvements in on-screen machine diagnostics, and standardized packaging user requirements. All these areas have defied standardization efforts in the past, and they could all contribute to simplified and more efficient packaging operations.
By linking ergonomics, navigation, and design, new HMI systems are able to display complex processes in a way that is easy for the user to understand and manage. The new OMAC standard goes one step further by defining a common look and feel between operator panels in packaging plants.
"We believe that standardization is imperative to improving our overall equipment effectiveness," Dr. Bryan Griffen, global automation manager at Nestlé and chairman of the OMAC Packaging Workgroup (OPW), told us. "We are fully committed to the PackML strategy, and we continue to support and develop this strategy through active participation in the OMAC Packaging Workgroup.
"We are developing complimentary tools and specification for application as part of our PackML strategy," Griffen said. "These include HMI specifications, communications standards, and safety system integration -- all of which are focused on improving the operability and maintainability of our packaging systems."
HMI common look and feel
At an automation conference, Griffen showed 13 different HMI screens on a single packaging line with absolutely no common look or feel, including applications for inspection, weight checks, coding, and packing and transport functions. More than 200,000 HMIs are in use in Nestlé factories, and there are more than 70,000 people involved in packaging operations. But because the screens are all different, specific training is required for each type of equipment, costing both time and money.
To address this problem, the Nestlé packaging and automation groups have developed a standard HMI solution. Machine-specific requirements are displayed in the center of each screen, but a common template has been produced for a top menu bar, command buttons, navigation, and active alarms and event messaging. The goals of the template are to be user friendly, to allow operators to become more mobile across machines and lines, and to make more diagnostic information accessible from the equipment.
The OPW committees are focusing both on base technology and its potential benefit for applications. "We have tried to be practical and balance the focus on technical details around the standard with the benefits the standard would provide for end users, machine builders, and system integrators," said Thomas Doney, senior research engineer at the Nestlé Product Technology Center and a member of the OPW.
It's good to see yet another step toward standardization on the factory floor. This is one more step away from hodge-podge world of plant automation. I would guess this will also give control engineers some relief from the daunting task of original programming.
It's actually amazing to me that there hasn't been a common HMI look and feel and standards prior to this kind of effort--or at least one that has any teeth. Coordinating that diversity must be a bear for organizations to manage let alone impeding worker productivity. Why has it taken so long to push standards?
HMIs are an interesting, sometimes overlooked area of focus for software/display technology improvements. Yet they play a vital part in what happens on the factory floor, and how well, and how quickly, operators can adapt to, or fix, problems in process control. It seems like improvements have been ongoing for a really long time. It's good to see that some kind of standardization is finally arriving, at least on packaging lines.
I agree it is a good thing, Ann, especially as systems are becoming increasingly complex. I would imagine this becomes a more manageable world for control engineers -- greater complexity, simpler interfaces and less original programming.
Rob, my understanding is that better, more use-friendly HMI systems are key for both control engineers and operators. There's a shift underway to put more decision-making into the hands of lower-cost operators rather than engineers, which is made possible by more automation of functions and databases that experienced engineers used to do, as you've mentioned several times. This is also being facilitated by better HMI systems.
That's a new twist I was not aware of, Ann. I didn't realize the decision making was shifting to lower-cost operators. I knew vendors were relieving plant operators of the original programming that used to be part of running a plant, but I didn't realize that meant non-engineers had their hands on the controls.
The decision-making can shift to lower-cost operators because they're making fewer decisions--and more low-level ones--as more functions get automated. This is by no means the case everywhere, but it's yet another cost-cutting trend. That's what I've heard, anyway.
I guess that shouldn't be surprising, Ann. This could be part of the trend of replacing the baby-boomer engineers at plants. As the boomers retire, I hear they are being replaced by younger workers who have less automation and control experience, but more computer experience, which is mostly appropriate given the changing nature of automation. And of course they would be lower-cost workers simply because of their youth and inexperience.
Interesting, Rob. I hadn't connected the dots between the baby boomer retiring trend and younger workers with the cost-cutting trend of using less expensive operators instead of engineers on the factory floor. I'm not sure they're the same thing. First, the engineer vs operator trend is usually described as being due to improved HMI, as we were originally discussing. Plus, isn't the first trend occurring mostly within engineering?
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