LVD and 61508-3 would be entertaining. Does anyone think that any of the
commonm computer OS's
could pass even SIL 1 requirements?
And how do you get a "Proven in Use" Compiler if Yet to be Proven compilers
cannot be used?
Or my other favorite is SIL X anything for consumer use. Who wants to admit
10^-X fatalities
per year caused by their device?
For Refineries and similar applications the standard makes sense to me. The
cumulative
probability that a valve will open when it shouldn't makes sense as a SIL
class. But to define
even just the valve itself to a SIL I think only adds to confusion and
potential mistakes. Such
as a valve failing to fully close, releasing product into a dyked area, has a
different
consequence from the valve casing rupturing in a manned control area.
"Jim Eichner"
<Jim.eichner@XANT To: <[email protected]>
REX.COM> cc:
Sent by: Subject: RE: Functional Safety
and the LVD
[email protected]
10/28/2008 03:57
PM
Ok but does that mean it won’t ever get published under the LVD? Maybe the
only answer is
“never say neverâ€.
Jim Eichner, P.Eng.
Compliance Engineering Manager
Xantrex Technology Inc.
phone: (604) 422-2546
mobile: (604) 418-8472
e-mail: [email protected]
web: www.xantrex.com
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From: David Clement [mailto:[email protected]]
Sent: Monday, October 27, 2008 4:03 PM
To: Jim Eichner; [email protected]
Subject: Re: Functional Safety and the LVD
61508 is not a product standard. It relates to systems that provide System
Safety where a
portion of the system is electrical, electronic, or programmable.
System Safety as a discipline looks at the severity of hazards that are present
if something
fails to perform as designed, the likely hood of it occurring, assessing if
the risk is
acceptable and if its not take mitigation steps to reduce the risk. 61508
provides special
considerations when the mitigation is provided by Electrical, Electronic or
Programmable. For
example; It has guidance on the software development rigor necessary for the
different Safety
Integrity Levels.
An RCD device provides a safety function for sure but a single device is
explicitly not
covered. Below is an excerpt from the standard scope.
does not cover E/E/PE systems where
– a single E/E/PE system is capable of providing the necessary risk reduction,
Dave Clement
From: Jim Eichner <[email protected]>
To: [email protected]
Sent: Monday, October 27, 2008 11:14:06 AM
Subject: RE: Functional Safety and the LVD
Those systems are covered, but there’s nothing that excludes products. Take
for example an RCD
device. Clearly its function is safety-related. Why wouldn’t the 61508
series be relevant?
Jim Eichner, P.Eng.
Compliance Engineering Manager
Xantrex Technology Inc.
e-mail: [email protected]
web: www.xantrex.com
Any opinions expressed are those of my invisible friend.
Confidentiality Notice: This email message, including any attachments, is for
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From: David Clement [mailto:[email protected]]
Sent: Saturday, October 25, 2008 2:12 PM
To: Jim Eichner; [email protected]
Subject: Re: Functional Safety and the LVD
61508 deals with electrical, electronic and program devices and systems that
provide safety
such as rail road signaling, safety shut down systems in power plants,
machinery interlocks. It
has several in depth sections on software that is used in systems that provide
functional
safety.
I don't see it being called out as part of a product safety directive.
Dave Clement
From: Jim Eichner <[email protected]>
To: [email protected]
Sent: Friday, October 24, 2008 1:44:53 PM
Subject: Functional Safety and the LVD
A search of the latest list of standards under the LVD does not turn up
any hits on EN61508, yet it would seem natural for this standard to be
considered relevant under the LVD. I'm not looking for the added work
that would imply, but I do need to know if it's coming.
Any thoughts or inside knowledge if this is coming our way?
Thanks,
Jim Eichner, P.Eng.
Compliance Engineering Manager
Xantrex Technology Inc.
e-mail: [email protected]
web: www.xantrex.com
Any opinions expressed are those of my invisible friend.
Confidentiality Notice: This email message, including any attachments,
is for the sole use of the intended recipient(s) and may contain
confidential and privileged information. Any unauthorized review, use,
disclosure or distribution is prohibited. If you are not the intended
recipient, please contact the sender by reply e-mail and destroy all
copies of the original message.
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