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Industry Group Pushes for Free Open-Source Ethernet Standard for Machine Communications

Industry Group Pushes for Free Open-Source Ethernet Standard for Machine Communications

As we are on the cusp of the Industrial Internet of Things and its extensive connectivity potential, one organization believes that industrial machinery and components can communicate data rapidly and reliably among themselves, system controllers, and ultimately to their human overseers via an open-source, software-based Ethernet communication standard.

This organization, Ethernet Powerlink Standardization Group (EPSG), supports Ethernet Powerlink, which was developed in 2001 by B&R Industrial Automation and links PLCs, I/O devices, sensors, motion controls and actuators, and HMI (human-machine interface) systems.

B&R formed EPSG in 2003, and Powerlink has been available since 2008 as downloadable, patent-free software.

EPSG has hundreds of members, counting mostly machinery and component OEMs and processing companies. Members test and certify Powerlink for their equipment (Powerlink meets IEEE 802.3 standards for Ethernet networks). Access to the software, though, is not restricted -- any company can download it from sourceforge.net for free.

What this means, according to Sari Germanos, technology marketing manager at EPSG, is machinery and device manufacturers and plant operators can readily build broadly interconnected, real-time automation networks using Powerlink.

Companies have promoted open communication standards for automation for some time. Examples include Sercos III from Rexroth, Beckhoff's EK9500 Ethernet/IP bus coupler, Simatic Net from Siemens, and Rockwell Automation's Ethernet/IP Network.

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Germanos, who is also business development manager at B&R, believes Powerlink has broader potential. B&R, alone, manufactures 1.2 million PLCs equipped with the communications technology, and the company is the fourth-largest PLC maker in the world.

Powerlink got a major boost in 2011, when China's national standard GB/T 27960-2011 recommended it for the country's huge machinery industry.

Germanos said OEMs that use the software can instantly communicate with Powerlink-enabled devices. "Everything works right out of the box," he said. "There is no need to license code, pay royalties, do paperwork, or involve lawyers."

Powerlink connects up to 240 nodes per network. Each network, in turn, can be connected and synchronized in an infinitely expanding capability.

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Powerlink bus frequencies meet stringent real-time requirements, Germanos said. Typical motion applications run at 400-microsecond cycle times, and some Powerlink applications run as fast as 100 microseconds.

Among the benefits of Powerlink for are more effective remote diagnostics for machinery OEMs, detection and correction of problems for plant operators before they cause unscheduled downtime, and more productively (and profitable) process lines.

Germanos said the protocol is effective for all types of manufacturing and can be used on almost all types of equipment. As long as PLCs need to connect to remote I/O devices, Powerlink is good to go, he noted.

Germanos will deliver a presentation on the Powerlink technology, called An Open Source Approach to Combining IoT with Real-time Machine Control, at Design & Manufacturing Canada, a Design News event that will take place June 16-18 in Toronto. It is part of a series of educational conference sessions on smart factories of the future.

Pat Toensmeier has more than 30 years of experience writing for business-to-business publications. His main areas of coverage have been defense, design, manufacturing, technology and chemicals, especially plastics and composites. He has reported extensively on developments in these areas from the U.S. and Europe, and covered industry events as well in Brazil and Asia. Toensmeier has held various positions at major publishers such as the McGraw-Hill Companies and Hearst Corporation. A graduate of the University of Missouri, he is a contributing editor for several print and online publications. Toensmeier is based in suburban New Haven, Conn.

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