PDF
Print
E-mail

Knowledge

Welcome to our knowledge section. Please use this section to educate yourself about Functional Safety. You will find here forum posts and a functional safety glossary with terms and definitions related to functional safety.

Latest forum posts

Subject Message
PFHsys value for PCB with 1oo2 type ...
Lachlan Grogan 13.1.2012 8:04		 Hi, I have a PCB I am working on. It has 2 sensors, one logic element and one final element. I have calculated SFF and DC and for my architecture I get a SIL CL of SIL2. I now need to calc...
3oo4 PFD calculation
Michal Kolarik 11.1.2012 13:36		 Hello everybody, I want to ask, if anybody of you was solving this in last time. I need to know PFD equations for this architecture. If somebody can help me, it will be appreciated. Than...
Re: IEC 61511-1 11.4.5
Edison Sakamoto 10.1.2012 11:03		 Dear Wang san, I am a little confused about the situation that you have. Looking at IEC 61511 table 6, for HFT=1 you are trying to reach SIL 2, aren\'t you? So, in IEC 61508 table 3 (type B sub...
Reliability data angle valve
fabrizio privitera 28.11.2011 14:06		 I\'m searching for the reliability data of an high pressure air operated angle valve. In the standard database (EXIDA-OREDA,..)they are not. Where can I find this data? Thanks
Re: Testing Proof Procedures to dem...
Kashif Channar 17.10.2011 20:12		 ISA TR84.00.03 \"Guidance for testing of process sector safety instrumented functions (SIF)\" Let me know if you need any further information on this. kashif

Latest glossary items

Term Definition
VHDL Very High Speed Integrated Circuit Hardware Description Language
SIL Safety Integrity Level
SFF Safe Failure Fraction
ROM Read-Only Memory
RAM Random Access Memory