Aspen Touch Solutions ATM-123R Series Especificações descarregar pdf (Página 365)

Customization FAQ A-29

A-29

16. How do I automatically set the Calc Level (calculation level)

of an extension?

Ans: Add the following to the Initialize function of the

extension code:

17. How do I automatically attach an existing stream to a Unit

Operation Extension when it is added to the PFD?

Ans: In the Initialize function of the extension, make an

object reference to the stream which will be attached to the

extension. Then use FindVariable to set the name of the

stream defined in the EDF equal to the stream object

reference.

The following code demonstrates this:

18. What is a “Forget” Pass?

Ans: HYSYS unit operations can calculate “product” variables

based on “feed” variables, “feed” variables based on

“product” variables, or a combination of the two. This can

lead to very complicated interdependency between the

variables in a flowsheet. When a variable is changed, HYSYS

must first “forget” all of the variables that were calculated

based on the original value, and then re-calculate based on

the new value. If the values are not forgotten, an attempt to

calculate a new value is misinterpreted by HYSYS as an

inconsistency.

Set hyContainer = Container

Set hyInterface = hyContainer.ExtensionInterface

hyInterface.CalcLevel = 1000

where:

Both hyContainer and hyInterface are declared as Objects

Dim hyFeed As Object

Set hyFeed = hyContainer.Flowsheet.MaterialStreams("Feed")

hyContainer.FindVariable("Feed").Variable.Object = hyFeed

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Aspen Touch Solutions ATM-123R Series Especificações Página 365