7 March 2003 The CFHT MegaCam control system: new solutions based on PLCs, WorldFIP fieldbus and Java softwares
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MegaCam is a wide-field imaging camera built for the prime focus of the 3.6m Canada-France-Hawaii Telescope. This large detector has required new approaches from the hardware up to the instrument control system software. Safe control of the three sub-systems of the instrument (cryogenics, filters and shutter), measurement of the exposure time with an accuracy of 0.1%, identification of the filters and management of the internal calibration source are the major challenges that are taken up by the control system. Another challenge is to insure all these functionalities with the minimum space available on the telescope structure for the electrical hardware and a minimum number of cables to keep the highest reliability. All these requirements have been met with a control system which different elements are linked by a WorldFip fieldbus on optical fiber. The diagnosis and remote user support will be insured with an Engineering Control System station based on software developed on Internet JAVA technologies (applets, servlets) and connected on the fieldbus.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jean Yves Rousse, Olivier Boulade, Xavier Charlot, P. Abbon, Stephan Aune, Pierre Borgeaud, Pierre-Henri Carton, M. Carty, J. Da Costa, H. Deschamps, D. Desforge, Dominique Eppele, Pascal Gallais, L. Gosset, Remy Granelli, Michel Gros, Jean de Kat, Denis Loiseau, J. L. Ritou, Pierre Starzynski, Nicolas Vignal, and Laurent G. Vigroux "The CFHT MegaCam control system: new solutions based on PLCs, WorldFIP fieldbus and Java softwares", Proc. SPIE 4841, Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, (7 March 2003); doi: 10.1117/12.461002; https://doi.org/10.1117/12.461002


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