[foxboro] Micro I/A upgrade to 6.2.1

List,

We had another fun day with Micro I/A today.  We have 3 Micro I/A =
stations
connected to Allen-Bradley Remote I/O thermocouple modules all =
throughout
the refinery.  They routinely drop off-line at all hours, prompting =
someone
to physically unplug the modules and then put the plugs back in to =
reboot.
To remedy this problem, Foxboro offered us version 6.2.1 of the Micro =
I/A
image. =20

Well, today we loaded the new image, initialized the Micro I/A's, =
loaded
their databases back, and...every single temperature was 15-20=B0F too =
high!
Our service guy made frantic calls to TAC and various other service =
guys,
and got no useful answers.  So, I'm sitting there, cursing Foxboro, =
berating
myself for even letting them in the refinery on a Friday, when I start
reading the Micro I/A 6.2.1 manual a little closer.  Buried somewhere =
deep
in the manual, and certainly not in big bold letters in the Release =
Notes,
is a table listing the HSCO1 and LSCO1 values that you need to enter =
for
each AIN block that you create to attach to a thermocouple so you can =
read
it.  THEY HAD CHANGED THE LSCO1'S ON TYPE J AND K THERMOCOUPLES!!!  =
They
used to be -319 and -382, now they are -346 and -454.  So, I do an
iccdrvr.tsk and change all the LSCO1's on all the AIN blocks, and =
presto, I
have the right readings again.

I'm not sure where to begin with this.  Does anyone in FoxMass actually =
test
these upgrade procedures?  How could Foxboro possibly modify the =
control
database to the point where the millivolt signal (on the two most =
common
thermocouple types, no less) coming in before the upgrade will not
correspond to the same temperature reading after the upgrade, and not
consider this significant?  I am flabbergasted.

For those of you on the list who have been cursed with this combination =
of
hardware, please remember to change the LSCO1's on the AIN blocks when =
you
upgrade to the 6.2.1 image.

Tim Lowell
Control Systems Engineer
Phillips Petroleum Company, Trainer Refinery
Phone:  610-364-8362
Fax:    610-364-8211
tlowell@xxxxxxxx
 
 
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