Re: [foxboro] 100 Series FBM Reliability Data
- From: "Ken Heywood" <kheywood@xxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Thu, 18 Oct 2007 18:32:02 -0400
PCS repairs a fair number of the 100 series. The failures we've seen are in one
or more of three catagories:
1. Blown fuse (for whatever reason)
2. Blown channel (usually one where someone hooked it to 220)
3. Blown fieldbus chips (usually from an ESD)
We never see bad A/D, channels out of spec or failed processors. Of course, we
see only the FBMs that people want fixed. We don't see the ones that end up in
the trash.
-----Original Message-----
From: dave.caldwell@xxxxxxxxxxxxxx [mailto:dave.caldwell@xxxxxxxxxxxxxx]
Sent: Thu 10/18/2007 5:30 PM
To: foxboro@xxxxxxxxxxxxx
Cc:
Subject: [foxboro] 100 Series FBM Reliability Data
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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