Re: [foxboro] HART AOUT gives error in sysmon

I guess we've been pretty lucky, in that we haven't seen too much of what 
David describes.  We too use the NOFAIL setting, and we do not do all that 
balun BS, even on the 4-wire transmitters.  It sounds like the HART comm 
is dropping out periodically.  Do you have the latest QF firmware in your 
FBM215?  Does a HART handheld connected at the FBM drop out, too?

Using HART on I/A is a pain in other ways, though -- extra ECBs, 
RIN-kydink blocks.  I keep hoping that there will be an AMS-like tool on 
I/A someday (or even a communication adapter to the real thing :) that 
will make all this pain worthwhile.  At least our 375s work, because the 
HART cards have more than 250 ohms resistance.


Corey Clingo
BASF Corporation






"Pulas, Philip" <ppulas@xxxxxxxxxxx> 
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Re: [foxboro] HART AOUT gives error in sysmon






David,

We see this all the time when using the NOFAIL setting for DVOPTS on the
ECB201.  We haven't been able to fix it and are just about ready to turn
Hart off.  If you set the channels to 4-20 you will get rid of it, but
then you won't be using the Hart functionality anymore.  However, Hart
has proven to be very useful for loop checks and discovering problems.

We actually have inhibited the DCI blocks (ECB201s), but still get the
system alarm key to flash green.  You have to actually inhibit the
entire FBM to stop the system alarm key to stop flashing.  We don't
inhibit the FBMs because we want to know if those have a problem.

I would like to know if anyone else has found a solution for this,
because so far Invensys has not been able to solve the problem.

Thanks,
Philip Pulas
Tesoro Corp.
Golden Eagle Refinery
Martinez, CA

 



 
 
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