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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