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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