Abstract:
The international standard IEC 61508 presents the basis activities related to the life cycle of Electrical, Electronic and Programmable Electronic Systems (E/E/PE) that a...Show MoreMetadata
Abstract:
The international standard IEC 61508 presents the basis activities related to the life cycle of Electrical, Electronic and Programmable Electronic Systems (E/E/PE) that are used to perform safety functions. This international standard provides in part 6 the techniques used to evaluate the safety related systems by the calculation of average probability of failure on demand. This calculation depends on the safety related system architecture : 1oo1, 1oo2, 1oo2D, 2oo3 or 1oo3 where MooN (M out of N) and MooND (M out of N with diagnostic), means M channels among N channels must properly work for executing the safety function for safety instrumented system (SIS) [1] and [2]. In this paper, we propose to compare different architectures by the calculation of the average probability of failure on demand and show the influence of the diagnostic coverage DC, the proof test interval T1, the common cause failure factors β and ßD and the efficiency K, which is associated to the 1oo2D architecture, on the calculation of the PFDavg.
Date of Conference: 24-26 October 2016
Date Added to IEEE Xplore: 05 January 2017
ISBN Information:
Electronic ISSN: 2327-1884