Handling of ramps and DVs in DMC sub-controllers

Posted by Keith Landells on February 20, 2003 at 18:54:18:

I'd like to see if others agree with some of our thoughts on :

1. Ramps in a sub-controller. Even though a ramp is assigned to a selection of subs, like any CV, if the ramp is imbalanced the whole controller switches off. It is then possible to re-commission the subs not involved with the ramp. This seems inconsistent to me.

2. It is not possible to assign DVs to a sub-set of the sub-controllers. Hence, if we make a DV critical it switches the whole controller off, even though it may only affect 1 of the subs within the controller. It would be nice to assign the DV within Build to 1 or more subs, and use this to switch off parts of the controller if the critical DV is bad

Have we missed something ? I'd like to understand if there are issues we've missed.

Follow Ups:

• Re: Handling of ramps and DVs in DMC sub-controllers Sean Goodhart 08:50:01 06/05/03 (0)
• Re: Handling of ramps and DVs in DMC sub-controllers Richard Hughes 08:25:36 04/23/03 (1)
  • Re: Handling of ramps and DVs in DMC sub-controllers Venky Venkataraman 08:40:31 04/30/03 (0)
• Re: Handling of ramps and DVs in DMC sub-controllers Venky Venkataraman 14:18:44 03/04/03 (0)

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Comments:
: I'd like to see if others agree with some of our thoughts on :

: 1. Ramps in a sub-controller. Even though a ramp is assigned to a selection of subs, like any CV, if the ramp is imbalanced the whole controller switches off. It is then possible to re-commission the subs not involved with the ramp. This seems inconsistent to me. 

: 2. It is not possible to assign DVs to a sub-set of the sub-controllers. Hence, if we make a DV critical it switches the whole controller off, even though it may only affect 1 of the subs within the controller. It would be nice to assign the DV within Build to 1 or more subs, and use this to switch off parts of the controller if the critical DV is bad

: Have we missed something ? I'd like to understand if there are issues we've missed. 


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