Title :
Architecture of a Safe Node for a Fieldbus System
Author :
Novak, T. ; Tamandl, T.
Author_Institution :
Vienna Univ. of Technol., Vienna
Abstract :
Fieldbus systems are more and more responsible for functions affecting people´s health. Therefore they are supposed to work safely, i.e. the fieldbus system must be free from unacceptable risk. Thus different measures specified in the international standard IEC 61508 have to be taken to reduce the risk, for example, a redundant hardware structure, add-ons to the protocol, integration of online self tests. A fieldbus system that is going to be enhanced with safety measures is the Local Operating Network (LON), standardized in EN 14908. Within the SafetyLon project hardware and software of a safe node for LON is developed. A safe node consists of an EN 14908 controller and two microcontrollers. The software comprises three layers. One of them is the safety layer including the safe protocol stack and the online self tests.
Keywords :
IEC standards; building management systems; controller area networks; field buses; microcontrollers; network operating systems; transport protocols; EN 14908 controller; IEC 61508 standard; SafetyLon project; building automation; fieldbus system; local operating network; microcontrollers; online self tests; safe node architecture; unacceptable risk; Automatic control; Automatic testing; Automation; Buildings; Control systems; Electrical safety; Field buses; Hardware; IEC standards; Protocols;
Conference_Titel :
Industrial Informatics, 2007 5th IEEE International Conference on
Conference_Location :
Vienna
Print_ISBN :
978-1-4244-0851-1
Electronic_ISBN :
1935-4576
DOI :
10.1109/INDIN.2007.4384739
