Re: [foxboro] BCALCI/BCALCO question

The back-initialization provided by the BIAS block works with its RBIAS
(remote bias) source connection, not with the MEAS.

The application below works:

         AIN01.PNT -> SWCH.INP1  (Process-based bias)
Graphics_Setpoint -> SWCH.INP2  (Operator-set bias)

          SWCH.OUT -> BIAS.RBIAS (Selected bias)
         AIN02.PNT -> BIAS.MEAS  (Process value to be biased)

          BIAS.OUT -> AOUT.MEAS  (Process value + bias)

PRIBLK = 1 for AOUT and BIAS; not required for SWCH since  
INITOx/BCALCx are not connected to upstream block.

AOUT.INITO/BCALCO -> BIAS.INITI/BCALCI
BIAS.INITO/BCALCO -> SWCH.INITI/BCALCI

SWCH.OUT will track the back-calculated remote bias when BIAS is on  
Local or when AOUT is in Manual.

If the back-init is used with the BIAS.MEAS link, the back-calc will not work.

HTH,
Edwin Nasol

Quoting Jeff Hurt <thehurtman@xxxxxxxxx>:

> We're building a control loop that looks like this:
>  
> AIN -> SWITCH BLOCK -> BIAS BLOCK -> AOUT
>  
> The connections are made automatically in the IACC.  When the
BCALCI, BCALCO, BCALC1, BCALC2 connections are made, there is no
output out of the switch block and it indicates it is tracking.  When
the BCALC connections are removed, everything works correctly and the
switch block no longer indicates it is tracking.  Any thoughts as to
why it doesn't work with the BCALC connections?
>  
> Thanks,
> Jeff 
>
>
>
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