Caution while configuring paramters in LIM block especially ROCOPT; I have
configured it as zero/NO thinking based on the description that this option
only provides alarm, so I did not end up using it, perhaps one has to set it as
1/YES to work.
ROCOPT: Rate of Change Alarm Option is a configured input. ROCOPT enables
(when true) or disables (when false) rate of change alarming. You can
change ROCOPT only by reconfiguring the block
The below configuration did NOT work for me, perhaps ROCOPT, have to try again.
So ramping up or down in FCS/foxboro is a nightmare it should have been a
simple user friendly block; I had to work use CALC block for ramp closing a
valve. I am still unsuccessful for the below request for continuous control and
so curious to know what will work.
Parameter Value
CP CP404R
COMPOUND C101
BLOCK LIM3641B
TYPE LIM
DESCRP LIM-50# VENT UREA SIDE
PERIOD 3
PHASE 2
LOOPID P3641
MEAS C101:FN3641B.OUT
HSCI1 100.0
LSCI1 0.0
DELTI1 1.0
EI1 %
PROPT 1
EROPT 1
PRIBLK 1
INITI C101:HC3641B.INITO
BCALCI C101:HC3641B.BCALCO
HSCO1 100.0
LSCO1 0.0
DELTO1 1.0
EO1 %
HOLIM 100
LOLIM 0
MA 1
INITMA 1
MCLOPT 0
FOLLOW 0
ROCOPT 0
ROCLIM 10
HSCI2 100
LSCI2 0.0
DELTI2 1.0
EI2 %
KSCALE 1.0
PRITIM 0.0
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On ;
Behalf Of Joseph M. Riccardi
Sent: Wednesday, April 12, 2017 7:07 AM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] Ramp in a cascade loop
Luciano,
Ultimately, what is your goal regarding the ramping; limit the max/min or rate
of change for the remote set point? Consider using the LIM block...
Joseph M. Riccardi
386-451-7607 Cell
Joe@xxxxxxxxxxxxx
"To give real service you must add something that cannot be bought or measured
with money; and that is sincerity and integrity." - Donald A. Adams
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On ;
Behalf Of Luciano André Farina
Sent: Wednesday, April 12, 2017 8:58 AM
To: foxboro <foxboro@xxxxxxxxxxxxx>
Subject: Re: [foxboro] Ramp in a cascade loop
My mistake...
PID1.SPT -> CALC -> PID2.*RSP*
instead of
PID1.SPT -> CALC -> PID2.SPT
If I understood the manual, the native PID ramp can be used only in LOCAL mode,
right? I need to use it in REMOTE.
Thanks
__________________________________________________________
2017-04-11 15:14 GMT-03:00 Gunter, Matt <matt.gunter@xxxxxxxxxxxxxx>:
We ramp the set point of a PID from within the PID itself. The
process is controlled by an IND block. There are something like five
parameters that need to be set in a given sequence and then once the
SPRAMP parameter (the last to be set) is cleared, the L/R needs to be
set to Remote. As I recall, you have to set the PID block itself to
ramp either over time or based upon BPC.
I don't think you can set this up with a CALC block because you set
the SPRAMP point and then watch it change back.
That is what we do.
Matt
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx
[mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of Luciano André Farina
Sent: Tuesday, April 11, 2017 11:41 AM
To: foxboro
Subject: [foxboro] Ramp in a cascade loop
Hi folks.
I am configuring a kind of ratio control loop, with an architecture
like
this:
PID1.SPT -> CALC -> PID2.SPT
I would like to implement a ramp between CALC and PID2, but the block
RAMP does not appear to be the best approach. LLAG can be used, but
the answer will not be linear.
Any ideas?
Thanks in advance,
Farina
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