Effects of varying diagnostic coverage on functional safety

Author

Ustoglu, Ilker ; Kaymakci, Ozgur T. ; Borcsok, Josef

Author_Institution

Dept. of Control & Autom. Eng., Yildiz Tech. Univ., Istanbul, Turkey

fYear

2014

Firstpage

1

Lastpage

6

Abstract

Diagnostics is one of the significant parameters of functional safety which concerns itself with revealing dangerous incidents that might impede the operation of safety systems. Diagnostic coverage factor (DC) is defined as a metric for diagnostics in that DC is one of the most important design parameters to measure the effectiveness of safety protection systems. This study addresses how diagnostics impacts proof test interval (T_I) when the system is halted completely; a thorough maintenance and changes in parts are performed. Besides this, the relationship between average probability of failure on demand (PFD_avg), DC, TI and mean time to failure (MTTF) are presented for 1oo2 and 1oo2D system architectures.

Keywords

fault diagnosis; probability; safety systems; DC; MTTF; PFD_avg; TI; average probability of failure on demand; dangerous incidents; design parameters; diagnostic coverage factor; diagnostics impacts proof test interval; diagnostics metric; functional safety; mean time to failure; safety protection systems; safety systems operation; system architectures; IEC standards; Maintenance engineering; Markov processes; Phase frequency detector; Reliability; Safety; Diagnostic coverage factor; mean time to failure; probability of failure on demand; safety architecture;

fLanguage

English

Publisher

ieee

Conference_Titel

Fundamentals of Electrical Engineering (ISFEE), 2014 International Symposium on

Print_ISBN

978-1-4799-6820-6

Type

conf

DOI

10.1109/ISFEE.2014.7050581

Filename

7050581