[foxboro] FBM04 PIO problems

Hi All,

  I am having a problem with one FBM04.  Last month it went red/green and
failed, but as I was removing the nosecone it rebooted and went back online.
I pulled the FBM and reseated it in the backplane a few times, & did the
same with the nosecone and the letterbug in case they had dirty connections.
The FBM came on line normally and worked fine.

  The sysmon log had three messages about the failure:

05/01/06  06:00:52 sysmonmsg
-00057 Currently using PIO bus B 
-00079 PIO Bus Access Error on A & B 
-00043 Equipment failed 

  Eight days later the same FBM04 went off line.  Sysmon had these messages:

05/09/06  17:55:45 sysmonmsg
-00079 PIO Bus Access Error on A & B 
-00056 Currently using PIO bus A 
-00043 Equipment failed 

  This time I installed a new FBM04 and put the old FBM04 in a spare slot in
another node.

  Twenty days later the FBM04 went offline with the same three sysmon
messages, so I replaced the nosecone with a new one, and put the old
nosecone on the original FBM in the other node.

  Yesterday the FBM04 went offline again, and again it had the same sysmon
messages.  I pulled it out of it's slot and installed it in a different
backplane (same letterbug ID & host CP).  If it fails again the only thing
left to replace is the letterbug.  We had a few letterbugs with short pins
many years ago, but this one looks fine and doesn't appear damaged.

  Can the field wiring for the four inputs and four outputs cause PIO
errors?

  In between failures the FBM has been working properly, but it is getting
annoying having it fail for no apparent (to me anyway) reason.

  Thanks for any help,

  Steve Murray
  Asarco

  

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