Re: [foxboro] 100 Series FBM Reliability Data

Ed,

What you're saying is correct, we've been able to solve the problem on some
cards by re-inserting the letterbugs. On other cards however this did not
work, replacing the cards along with the nosecones and swapping the
letterbugs did not solve it either. We replaced a couple of mounting
structures, which worked in some cases, but did not solve the problem for
all of the problem FBM's. Our electrical maintenance crew is used to
"pulling" the faulty FBM's by now and this always works, so I guess we'll
manage until we find the budget to replace them all eventually by 200's....

Thanks & rgds,

Dirk Pauwels - DCS/MOC coordinator
Engineering dept.
Hexion Specialty Chemicals
E mail: dirk.pauwels@xxxxxxxxxx
T.  +32.(0)3.570.95.97
F.  +32.(0)3.570.16.09
Mob. +32.(0)497.428.300


                                                                           
             "Larsen, Ed"                                                  
             <ed.larsen@xxxxxx                                             
             vensys.com>                                                To 
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                                                                   Subject 
                                       Re: [foxboro] 100 Series FBM        
             19-10-2007 15:37          Reliability Data                    
                                                                           
                                                                           
             Please respond to                                             
             foxboro@freelists                                             
                   .org                                                    
                                                                           
                                                                           




Dirk,

There has been an issue with FBM100 series going offline and back online
seemingly at will. Make sure your letterbugs are fully seated. They have
been known to work loose in the nosecone. =


-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of dirk.pauwels@xxxxxxxxxx
Sent: Friday, October 19, 2007 2:44 AM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] 100 Series FBM Reliability Data

We have a fair number of FBM100's, from '95. Can't say we experienced
any
reliability problems over the past 12 years. Some minor channel
problems,
probably due to incorrect connections.  We do have some cards going
offline
occasionally, but after replacement of the cards the problem remained,
so
the problem probably resides in the mounting structures....We also have
a
large amount of FBM 100 spares, so we're not thinking of replacing our
old
FBM100's, there's no way I can justify to management why we should be
replacing them....
We also have the new FBM200's, I like them better, because they're
cheaper,
consume less space and allow for very clean and neat wiring in our new
cabinets. Replacing the old ones however would mean downtime, and a
considerable investment, which at this time cannot be justified.

Rgds,

Dirk Pauwels - DCS/MOC coordinator
Engineering dept.
Hexion Specialty Chemicals
E mail: dirk.pauwels@xxxxxxxxxx
T.  +32.(0)3.570.95.97
F.  +32.(0)3.570.16.09
Mob. +32.(0)497.428.300


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             <dave.caldwell@do

             wcorning.com>

             Sent by:
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Subject =

             18-10-2007 23:31          [foxboro] 100 Series FBM

                                       Reliability Data

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             Please respond to

             foxboro@freelists

                   .org

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All Knowing List,

I need help in justifying to management why we should be replacing the
1989 vintage 100 series FBMs in our plant with brand new 200 series. The
question is being asked how much longer can we continue to run before
these FBMs start to fail (never mind that they aren't being made
anymore).

We have collected failure data from our own plant that suggests that at
least some of the FBMs are showing signs of aging. I base this on a
marked increase in EEPROM upgrades for the very oldest FBM04s in recent
years.

I've looked at the data Foxboro provides for 100 series reliability in
the past, and don't think their numbers show any big failure increase.
(In fact, I think some of the FBMs actually improved with age!) Of
course, this data is most likely based on returned FBMs and some folks
may just be putting their old ones in a dumpster.

Anyway, my questions for the list are:
* Does anyone have any failure data on very early 100 series FBMs?
* Are there signs that these are reaching end-of-life?
* Is there a reliability justification for replacing these older
modules?

Your thoughts are appreciated.

Dave


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