Re: [foxboro] FBM communication error

        We just had a similar problem this last weekend.  Lost power
throughout plant and when it was restored we had a bout 32 - 40 modules that
the System Management software said were offline.  I received the same Error
"PIO Bus Access Error on A & B".  We tried putting new modules in the rack,
but we still could not get the to communicate with the CP.  We finally
rebooted the CP. After this the modules came on line in the faulted state,
so I did a down load to each module.  This solved the problem.

        This problem only occurred on about 10% of our I/O modules after the
power loss.  I should also state that the CP's were on a UPS and never did
lose power.

        We also had a few modules that exhibited the same systems, but when
we either shut power off/on to the rack or reseated the letterbug the
problem corrected itself.



James Mueller
Process Control Technologist
Tilden Mine
(906) 475-3534
JDMueller@xxxxxxxxxxxx



-----Original Message-----
From: Penndorf, Rocco (RP) [mailto:RPPenndorf@xxxxxxx]
Sent: Monday, September 08, 2003 8:17 AM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] FBM communication error


Hi list,

we encountered the following problem. 
A FBM01 stopped communicating with its host cp. The message in the error log
was saying "PIO Bus Access Error on A & B".
So, we replaced the FBM and everything was fine like before. 
After that i took the supposedly broken FBM and have put it into a test rack
and what a surprise sysmon was happy with it.
Any ideas what could have caused those communication problems despite of the
fact that FBM has no hardware failure.

Best Regards    

Rocco Penndorf
Process Control Engineer / Acrylic Acid Plant
DOW - Boehlen
Tel.: +49 (0) 34206-8-7524
Fax: +49 (0) 34206-8-7522
E-Mail: rppenndorf@xxxxxxx


 
 
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