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Multiplication of PID out with another PID out before passing to AO

Hi,
I have configured a PID control module with AI1 and AO1 for Input and output respectively, let us consider it as PID1.
I Have kept a multiplication block between my PID1 out and AO1's CAS_IN. In the Multiplication Block my PID1 out will be multiplied with another PID blocks output lets say PID2 (PID 2 out scale is 0.95 to 1.05) as per process requirement.
The BKCAL_OUT of AO1 Block is wired to BKCAL_IN of my PID1
In this case if my PID1 generates an output of 20 and my PID 2 output is 100% (ie 1.05 as per out scale) my value at CAS_IN of A01 will be 21,So  my PID1 BKCAL_IN will get 21.
Is this configuration correct? Normally PID out and AO blocks BKCAL_OUT will be same so what will happen in this case? Hope you understand what Im trying to do please suggest is there is any better way.
Thanks,
Neeraj S
Neeraj S
  • gamella
    Ok, thanks.

    Not sure because FX3762 function is unknown but I will use a ratio where RATIO is slave of TIC3781 and FX3762 OPUT is wired into RATIO IN_1. Control valve is then slave of ratio block.

    IN_1 does not require BKCAL wired so I think this could be best approach as long as FX3762 OUTPUT seems to be a small value that will not require strict bumpless transfer precaution.

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