Dear Dan
You are correct, an IEC 61508 SIL is a property of an overall safety-related
function or system.
It cannot be applied to a constituent part.
However, IEC 61508 gives you a list of the things that you need to provide
safety-related systems designers with, so that they can decide how
A customer called this week and asked what our SIL rating is on one of our
products (Programmable Logic Controller). I had never heard of a SIL
rating. I went to the web and discovered SIL stands for Safety Integrity
Level and is addressed in IEC61508. My impression, from the web search, is
Actually, I understand that those devices that shoot darts are called
Tasers,
while stun guns have two metallic probes with about 20 kV across them when
the trigger is pushed. Typically they are used in direct contact with the
aggressor, so there would not be any live wires or darts bouncing
Gregg, it's bad enough being in Reliability getting on a plane without
thinking of the probability of failure, how old the parts are, is there
enough redundancy, number of failure free trips etc. etc. etc.
Please, let's not go there ... grin
Reissue those special air marshall pistols from
...at least not North American trains, whose technology and
infrastructure has fallen embarrassingly far behind that of much of the
rest of the world.
Bob Wilson
TIR Systems Ltd.
Vancouver.
-Original Message-
From: lisa_cef...@mksinst.com [mailto:lisa_cef...@mksinst.com]
Sent: May 3,
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