Eliminating redundant encoders, new device simplifies machine safety designs
Leine & Linde, Hedenhain Corp., wood processing
SCHAUMBURG, Ill.  -  Leine & Linde says its latest technology allows incremental encoders to be applied in machinery lines without requiring a redundant encoder or secondary sensing devices. As more and more automation finds its way into the manufacturing process, safety solutions are needed to protect operators, but when the motion control relies upon feedback from incremental encoders, this has usually resulted in a redundant encoder being introduced to assure reliable control. 
Lein & Linde says that in industries like wood manfacturing where equipment designs are mature and established, redundant safety interfaces are not desired or may not even be possible without complete overhaul of the equipment. "The ideal solution is an incremental encoder with the ability to provide guaranteed output signals over a single cable in an industrial environment," says the company, which is based in Sweden and whose products are distributed by Hedenhain Corp. in Schaumburg, Illinois.
The Leine & Linde 850 shaft and 862 hollow-shaft encoders have been revised to meet these requirements by providing safe outputs for incremental encoders. The heavy, severe duty encoders are suited for drive and measurement applications and are certified for SIL2/PLd, Category 3 applications. Output signal validity is assured by comparing raw sensor signals to digital output states and validating that against the actual values output to the control. If all values are not in agreement, or the power supply is not within specifications, a status signal signifies the output is invalid.

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Bill Esler | ConfSenior Editor

Bill wrote for WoodworkingNetwork.com, FDMC and Closets & Organized Storage magazines. 

Bill's background includes more than 10 years in print manufacturing management, followed by more than 30 years in business reporting on industrial manufacturing in the forest products industries, including printing and packaging at American Printer (Features Editor) and Graphic Arts Monthly (Editor in Chief) magazines; and in secondary wood manufacturing for WoodworkingNetwork.com.

Bill was deeply involved with the launches of the Woodworking Network Leadership Forum, and the 40 Under 40 Awards programs. He currently reports on technology and business trends and develops conference programs.

In addition to his work as a journalist, Bill supports efforts to expand and improve educational opportunities in the manufacturing sectors, including 10 years on the Print & Graphics Scholarship Foundation; six years with the U.S. WoodLinks; and currently on the Woodwork Career Alliance Education Committee. He is also supports the Greater West Town Training Partnership Woodworking Program, which has trained more than 950 adults for industrial wood manufacturing careers. 

Bill volunteers for Foinse Research Station, a biological field station staddling the border of Ireland and Northern Ireland, one of more than 200 members of the Organization of Biological Field Stations.