I am converting some old Foxboro SMS control schemes to run on I/A. There
is some code that does validity, rate of change and time-out checking on
some GC data. If the GC data is good the code does PID control with this
data (in the code itself, not through a PID block). The analyzer has a
cycle time of 15 minutes and sets a boolean flag true for 60 seconds on a
fresh update.
I am trying to determine if I should stick with code from the SMS and
convert it to HLBL or use standard I/A blocks to accomplish the same thing.
My idea for I/A is to do validity, rate of change and time-out checking via
a CALC block. Do the pid control via a PIDA block and on invalid GC data
put the block in manual and alarm. Part of the problem with this approach
is tuning the PIDA block. I have done an extensive step test and have come
up with tuning parameters (with a large reset time). The testing of this
PIDA seems to be doing a good job, but the GC update time has me concerned
about timing issues.
Could someone suggest a solution to GC control on I/A?
Thanks,
Rory
-----------------------------------------------------------------------
This list is neither sponsored nor endorsed by the Foxboro Company. All
postings from this list are the work of list subscribers and no warranty
is made or implied as to the accuracy of any information disseminated
through this medium. By subscribing to this list you agree to hold the
list sponsor(s) blameless for any and all mishaps which might occur due to
your application of information received from this mailing list.
To be removed from this list, send mail to
[EMAIL PROTECTED]
with "unsubscribe foxboro" in the Subject. Or, send any mail to
[EMAIL PROTECTED]
