[foxboro] MDACT on ESSCOR simulator

I have a very early vintage ESSCOR power plant simulator that uses the FS=
IM
software to handle the control system model.  The disk drive in the maste=
r
simulation computer crashed a few months ago and through a comedy of erro=
rs
there was no current backup.  ESSCOR has managed to reconstruct the syste=
m
for me and I have worked through several bugs in getting the system worki=
ng
again.  I have one last known problem with the MDACT block.  There are tw=
o
drive limit switch inputs to the MDACT FBM which are linked to two
parameters, LIMINC and LIMDEC. The problem I have is that the LIMDEC
parameter is always true which prevents the MDACT block from pulsing the
drive in the decrease direction.  ESSCOR uses a cross reference file to
link process model variable names to Foxboro inputs and outputs. For thes=
e
two inputs, the cross reference file links them both to logical constants=

that are always false.  Obviously something is not right with the cross
referencing.  ESSCOR generally uses a slightly different parameter name i=
n
the cross reference file than Foxboro. For example, to connect a model
variable to an AIN block, ESSCOR uses the parameter name .POINT instead o=
f
.PNT.  But in the case of the these limit switch inputs, the parameter na=
me
is the same, LIMINC and LIMDEC.  I wonder if someone else with an early
vintage ESSCOR simulator with an MDACT block could check their CrossRef.t=
xt
file and tell me what parameter name is used for these two points. =


Thanks for your help.

Cyrus Taft
EPRI I&C Center
 
 
_______________________________________________________________________
This mailing list is neither sponsored nor endorsed by Invensys Process
Systems (formerly The Foxboro Company). Use the info you obtain here at
your own risks. Read http://www.thecassandraproject.org/disclaimer.html
 
foxboro mailing list:             http://www.freelists.org/list/foxboro
to subscribe:         mailto:foxboro-request@xxxxxxxxxxxxx?subject=join
to unsubscribe:      mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave

Other related posts: