The human-machine interface (HMI) is the window to the equipment’s operations. As remote connectivity and data sharing continue to play larger roles, machine builders capitalize on the HMI’s digital capabilities. This select panel of experts discusses where HMI software is leading operator interface, as well as the equipment it puts a face on.
How can HMI software be used to analyze the data to create actionable information that can be used to improve equipment?
Jeff Hayes, Beijer Electronics: HMIs can gather data from various IIoT devices for preventive maintenance purposes—machine hours of operation, HMI display usage, operating temperatures including extreme conditions, CPU utilization, storage usage including movement of data off local machines to central or remote repositories.
HMIs can be programmed to record operator interactions, including which items are acknowledged or ignored, how long it takes to acknowledge an alarm, frequency of screen switching, how long each screen might be displayed and how the operator interacts with each screen.
Do frequent database backup, including moving the data off of the HMI to local backup and/or remote storage devices.
Jeff Hayes is regional product manager at Beijer Electronics.
Ramey Miller, Siemens: HMI software allows you to create visual indicators for any number of events and items on equipment. Data can be collected and shown in charts to indicate a trend or relationship between events happening on the equipment. For instance, showing the relationship between unit counts pass/fail during inspection in relation to rate of operation can help to optimize performance. Another is the ability to display error codes with descriptions of the possible causes and remedies. The HMI is the window into the various other controllers and smart devices on the equipment. Being able to quickly display issues to the operator and provide direction into correcting them improves overall performance.
Ramey Miller is HMI product manager at Siemens.
Chuck Harrell, Advantech: The most critical actions will only be taken after collecting rich data and extracting useful information. The PC-based platform runs HMI software for real-time data collection and also allows users to execute other applications for the first-level data process or analysis.
Chuck Harrell is key account and product marketing at Advantech.
Chris Harris, Revere Control Systems: Process values can be coupled with real-time trends on a sliding bar graph that tracks process min, max, and directional movement over a given time span.
Lee Clore, Onyx Industries: Improving equipment performance is a function of preventive medicine and analysis of data. Missing defined machine service intervals creates risk and headaches. As an example, missing one or more lubrication intervals on a gearbox or linear actuator can cause a device to eventually fail. Then it’s time to scramble in order to get back up. The plant is losing many dollars per hour, and shipping schedules are in jeopardy. The fix is expensive.
It’s a production nightmare—one that was avoidable. HMIs in combination with PLCs can enforce critical actions like service intervals. Based on things like accumulated run time or load monitoring, the HMI can communicate service needs of the machine up to maintenance. The HMI may even log the last service interval and display it at the machine showing who performed the work with a date-and-time stamp. In the event that the service interval has passed without attention or reset, the PLC and HMI may shut down the ability to run by doing something as simple as making a cycle-start touch point invisible until the service is performed.
Since HMIs are a communication hub at the machine, they may also be used for analytic purposes. Logging data continually about the causes of downtime or motion faults over time can allow a good technician to find potential improvements. As an example, a servo-driven press feeder may have regular following error faults when feeding larger material. On the surface, that may not be a surprise and written off as an undersized servo motor. However, digging in and analyzing the frequency of the faults compared against a specific clamping fixture or material supplier may reveal a deeper root cause.
Lee Clore is owner/controls designer at Onyx Industries.
Robert Zeigenfuse, Avanceon: One could develop analytic applications in HMI script to provide actionable information, but this can be limiting to real quality analytics. This should be a separate technology application like MES, which can then utilize the existing HMIs and or mobile devices to get information or actions to the operators.
Chirayu Shah, Rockwell Automation: As information continues to be increasingly important for operational excellence, the availability of relevant, real-time data has become a must for operators. For instance, the HMI is critical for providing in-depth information about alarms. Multiple alarm options, including tag-based and device-based alarms, provide reliable visibility into critical issues and help to improve response time.
To make quicker, better-informed decisions and support plant floor teams, software has built-in analysis capabilities, which help to showcase contextualized production data by pulling from a variety of sources such as data logs, live data and historical data. Operators also have the ability to easily bring trends front and center with ad-hoc drag-and-drop capabilities. They also can perform a quick ad-hoc analysis, evaluate data from the last shift or even look at basis statistics like min/max/average on process data to make better decisions.
Chirayu Shah is marketing manager, HMI software, at Rockwell Automation.
Vikram Kumar, EZAutomation: HMI software that has data-logging and trending capabilities can relay important information, such as production counts, machine faults and status alerts, to plant personnel in real time, so one can act accordingly to improve machine efficiency. If HMI software can process machine data coming directly from inputs and outputs and compute statistical analysis on the data using scripting and math formulas, one can use that data to improve machine efficiency or perform preventive maintenance. The more information you get in real time automatically, the faster plant personnel can act to improve machine efficiency and ultimately increase the company's bottom line.
Vikram Kumar is president/CEO of EZAutomation.
Allen Tubbs, Bosch Rexroth: Since HMIs in general are adopting more connectivity into the IoT world, they are able to easily connect to upper-level systems and other cloud/server-based software that perform analytics or machine-learning operations. Now, while standing in front of the machine, an operator or engineer can view historical data, trends and deep analytics by viewing dashboards from those systems on an HMI-based Web browser. It’s a step up from the traditional button-replacement HMI.
Alicia Millinger, GE Digital: An HMI should be more than a passive partner, collecting information, monitoring performance and generating alarms. An HMI should anticipate operators’ needs, delivering the precise information they need quickly and intuitively to support the best possible decision-making.
Fourth-generation HMI combines a series of new approaches to build an HMI that acts like an extension of an operator. As an example, fourth-generation HMI bridges the gap between operations and maintenance. When an out-of-spec event takes place in the HMI, the automation system can trigger a work process to interface with the CMMS/EAM, secure a work order number, send specific instructions including GIS location, and facilitate corrective action to remediate the problem quickly.
Alicia Millinger is marketing manager, automation software at GE Digital.
Asako Takayasu, Fuji Electric: Data sheets with expanded functions are available—not only numerical data but also additional parts such as a static pie graph can be included, which is very convenient and practical for daily reports. Also, you can generate the sheet in PDF and store them in SD card or USB flash drive. With the FTP server, managers can get them from their office remotely or simply print them out with the network printer as long as the HMI in the facility is connected to the local network. With the usage of data collection software, you can store the production data straight to a database such as Microsoft SQL server for higher-level analysis.
Asako Takayasu is international product specialist, HMI, at Fuji Electric.