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

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Posted by Sean Goodhart on June 05, 2003 at 08:50:01:

In Reply to: Handling of ramps and DVs in DMC sub-controllers posted by Keith Landells on February 20, 2003 at 18:54:18:

A neater work around (requires no CCF logic) is to make the critical FF be an MV (may need some re-ordering of variables) and set its SRVIND=2 (i.e. FFW) and LOOPST=0. Then you can assign the FFW(MV) to a specific subcontroller to which it is critical.

The LP will ignore the 'fake' MV, its impact simply being incorporated in the prediction update step, because it is not available for control.

Ensure you don't make unnecessary connections in the CCF by setting eveything but the VIND and validity limits to LOCAL.


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