Re: [foxboro] FBM224 redundancy?

Re: FBM224 redundancy and " We are considering doing this,  What exactly is
entailed and how hard is this to setup/maintain?"

I'm afraid that I have to admit that I don't know the details. Sigh... I
hate that.


In general, the approach would be:

1) Two FDSI FBMs
2) Two "identical" FBM configurations
3) Two sets of DCI blocks
4) Logic above the DCI blocks to switch to the good signal- Signal Select
(SSEL) is the best choice. Set it to HI (or LO) select and set the options
to reject a BAD input. The output of the SSEL is your redundant reading.

It would be easy to set this up as a loop typical in FoxCAE or IACC.

It's harder in ICC.



Regards,
 
Alex Johnson
Invensys Process Systems
Invensys Systems, Inc.
10707 Haddington
Houston, TX 77043
713.722.2859 (voice)
713.722.2700 (switchboard)
713.932.0222 (fax)
ajohnson@xxxxxxxxxxx

-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Jeremy Milum
Sent: Tuesday, January 25, 2005 3:11 PM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] FBM224 redundancy?

On Fri, 21 Jan 2005 08:26:10 -0500, Johnson, Alex (Foxboro)
<ajohnson@xxxxxxxxxxx> wrote:
> The FBM224 does not support it the way that the FDSI FBM does under a
CP270
> However, you can build redundant configurations using more blocks and some
> clever cabling.

We are considering doing this,  What exactly is entailed and how hard is
this to
setup/maintain?

Jeremy
-- 
Patron saints in general are broadband connections to the Almighty
- Michelle Delio, Wired News
 
 
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