Re: Handling of ramps and DVs in DMC sub-controllers

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Comments:
: If a ramp is configured as psuedo ramp, it trips only the sub controller.

: I know of APC engineers who have done this on some of their projects to get around the ramp problems.

: Venky

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: : I believe that the reason that the whole controller shuts down is due to the point in the controller cycle at which the imbalance is detected.

: : For example if a sub-controller detects that a critical variable has gone bad, it detects this during the input variable validation, before the LP is run

: : But .. if a ramp is imbalanced this is not detected until the LP solution has completed and failed to "balance the ramp"
: : If a single sub-controller was switched off this would require a second LP solution, with no guarantee that there is enough time for it to run

: : So as a pragmatic solution the whole controller is switched off

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