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Fault tolerant sequential control

: Neugebauer, Reimund; Barthel, S.; Richter, M.

Fulltext urn:nbn:de:0011-n-1416538 (312 KByte PDF)
MD5 Fingerprint: bdb4b239c2e9b74cb2d47990e55a3818
Created on: 30.3.2011

Neugebauer, Reimund ; Fraunhofer-Institut für Werkzeugmaschinen und Umformtechnik -IWU-, Chemnitz:
Sustainable production for resource efficiency and ecomobility : Manufacturing Colloquium, September 29-30, 2010 Chemnitz; ICMC 2010
Zwickau: Verlag Wissenschaftliche Scripten, 2010 (Berichte aus dem IWU 54)
ISBN: 978-3-942267-04-5
International Chemnitz Manufacturing Colloquium <2010, Chemnitz>
Conference Paper, Electronic Publication
Fraunhofer IWU ()
process; reliability; control

Due to an increasing number of functions and process steps modern mechatronic assembly lines become more and more complex. Especially high precision systems face the conflict between extended availability requirements and system complexity, bearing in mind the related economic pressure. Besides the increasing demands in productivity there are also raising demands in availability and reliability. Hence a systematic approach of manufacturing and assembly plants is necessary. To meet this challenge a consortium consisting of several different companies and Fraunhofer IWU has started the project VerMont. It is focused on an integrated concept to significantly improve the availability of complex units. The ambitious tasks were the increase of the MTBF (Mean Time Between Failure) and the reduction of the MTTR (Mean Time To Repair) by means of complementary interventions in the control and assistance level. To minimize the lifecycle costs five different approaches have been examined. One of them seems to be well suited and is presented in this paper. The so called fault tolerant sensor / time sequence control should work at the level of system control. The approach is that a fault sensor signal is tolerated as transition in the sequencer as long as there is no risk for the system, product or operator. The necessary repair operation can be postponed to the regular production breaks. The developed solution possesses to apply the approach at Assembly plants during the planning or even to expand existing plants to increase their availability.