I fully agree with Bo. From my perspective I would only install none FT on
plants which could tolerate the shutdown in the failure case. Therefore for
these units if I want to install a new image it's simple a case of cost
against benefit analysis. The problem starts when we fit FT systems knowing
we will only get a shutdown every 4+ years.
The upgrade strategy that Bo describes is very similar to that already
adopted by Foxboro for their online Spectrum UCM migration. So in principle
we know it is sound thinking and has worked, all be it with different
hardware. You have my support for the push to make this issue the only tall
poll. If you need further support from the UK I will include this subject
for our next UG meeting(October). For myself I have been pushing this topic
hard through the UK organisation both with my Shell hat and also in my
position as Chairman off the UK UG.
As I think has been said. There may be many thing which irritate you as a
user of I/A. BUT in my opinion the system is basically sound and is only
seriously compromised by control station issues.
Regards,
Dave
__________________________________________________
D.G. Williams, CME/72/04 Tel: (0151 350) Ext: 4480 Fax:4566
Shell UK Ltd Downstream Oil, Stanlow Manufacturing Complex
PO Box 3, Ellesmere Port, South Wirral, L65 4HB
Internet [EMAIL PROTECTED]
Pager 01399 760805 Message 01399 1144
__________________________________________________
> ----------
> From: Stear, Bo[SMTP:[EMAIL PROTECTED]]
> Sent: 20 July 2000 19:58
> To: 'Foxboro DCS Mail List'
> Subject: RE: Back on the Soap Box
>
> I would think that the most likely target for online upgrade would be
> those
> CP's that are fault tolerant and that have dual field busses. I can't
> visualize any possible way to provide online upgrade capability otherwise
> and I wouldn't want to start off by asking for the impossible.
>
> -----Original Message-----
> From: David Johnson [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, July 20, 2000 1:48 PM
> To: Foxboro DCS Mail List
> Subject: Re: Back on the Soap Box
>
>
> To add to what Neil just said, what about having to EPROM the FBMs, do we
> have to have redundant I/O too?
>
> David
>
>
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