Emerson Exchange 365

Danaca,

No there isn't a way to do it using a string input with Batch Executive prompts but you can prompt for a number that will relate to the given Named Set.

Example: Enter 1 for Tank A, 2 for Tank B, 3 for Tank C or 4 for Both A and B.

Then you logic can verify that the operator has entered a valid number and what they selected.

This can be done if you develop a prompt engine outside of the Batch Executive and do it at the operator interface/controller.

Regards,
Matt

If you have Tank_A, Tank_B and Tank_C implemented as batch unit instances of same Unit Class (let's say RAWMAT_UNIT_CLASS) this is automatically provided by DeltaV Batch Executive.
Having a Unit procedure on your recipe defined to use a RAWMAT_UNIT_CLASS unit instande in DEFER mode a prompt may be raised by Batch executive. When the recipe reaches the point it has to activate that Unit Procedure and the unit to use has not been defined yet by the operator, a prompt will be raised. This prompt has a dropdown to select which unit instance of RAWMAT_UNIT_CLASS will be used.
Text on that prompt cannot be customizez it something like "Select Equipment for <Unit Procedure Name:[X]>".

However, if Tank_A, Tank_B and Tank_C are not defined as batch units the required redesign may be not worth it only to provide an specific user interface control (dropdown).
Also have in mind that total number of batch licenses will increase.

Another issue could be operator selecting a unit that is already in use (not available) or a unit from RAWMAT_UNIT_CLASS that for some reason,is not valid (for instance because is not physically connected to destination tank).
Use of equipment trains will be required to fiter valid units, so dropdown in unit selection prompt will show only valid units (physically valid I mean, as defined in downstram units) and "not available" will be shown in dropdown list for those units that are valid but are not available.

Regards