[foxboro] FBM04 lockup

We had something strange happen the other day, and I post it here just to 
see if anyone else has seen it.

Apparently the inputs on an FBM04 all froze.  We got no system or bad I/O 
alarms (I went back through the sysmon messages and checked, and nothong 
in the chain to the FBM was inhibited in System Management).  Failsafe 
configuration is at its defaults, which is to hold last value, but we 
still should have seen something in sysmon if the card failed.  Lights on 
the card were green.


This condition remained for close to two weeks (yeah, don't get me started 
on what else that means) until it was finally noticed in the face of 
changing plant conditions.  Our I/E tech pulled/pushed the card and it 
came back fine.  From what I am told, the outputs were still working, but 
I can't confirm that.


As is typical with cosmic-ray-related phenomena like this, the plant 
manager got worried, and wondered how many other FBMs could be frozen.  I 
searched the CSC site and didn't find anything pertinent to what we saw -- 
CARs, HHs, etc.  The firmware on the card is pretty recent (61.1 IIRC).  I 
want to replace it and get an engineering eval, but that hasn't happened 
yet (don't get me started on that, either :)


Anyone seen anything like that before?


Corey Clingo
BASF Corporation



 
 
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