Physics
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..pac..6p22b&link_type=abstract
American Physical Society, Particle Acceleration Meeting, May 12-16, 1997, abstract #6P.22
Physics
Scientific paper
Wherever applicable IO nodes connected by a field bus (FB) have apparent advantages: Simple and flexible installation and cabling, easy signal conditioning as well as data filtering and process security provided by intelligent actuators and sensors. The cost of a complex 3rd control system layer may be a high development effort. At BESSY several design principles of this layer control the risk: A few multi purpose IO cards form a modular set. Multiple IO bus connectivity provides high installation flexibility. `Controller Area Network' (CAN) is the FB connected to the VME system of the standard model control system. Communication is provided by a small set of software modules designed to be easily adapted to hardware changes. Communication protocol with BESSY IO modules is a small and efficient subset of the `CAN Application Layer' (CAL) standard. That protocol minimizes the effort to integrate commercial modules from vendors following the CANopen standard. At BESSY II the CAN based FB layer will satisfy more than 80% of the IO demands.
Bergl J.
Kuner B.
Lange Robert
Muller Iris
Müller Reto
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