User-Defined System Constants

In some cases, resolving all system constants at the same time is insufficient. Therefore, ASCET provides the possibility to create user-defined subkinds of system constants, each with its own configurable resolution time.

For each user-defined subkind of system constants, the following information must be provided in the form of an ASCET options set:

a unique identifier
a unique label that is used throughout the ASCET user interface for the subkind of system constants
an optional overlay icon for elements to indicate the subkind of system constants
a possibility to select the resolution time for the subkind of system constants

A sample file for a user-defined subkind of system constants is shown in Example: User-Defined System Constants File. For more information, see Creating and Using User-Defined System Constants.

The option sets for user-defined subkinds of system constants appear as subnodes of the "Modeling\User-defined System Constants" node in the ASCET options window.

The following rules apply to the creation of user-defined subkinds of system constants:

If a subkind uses an existing element kind as label, and the spelling is identical, the subkind is ignored.
If a subkind uses an existing element kind as label, and the capitalization is different (e.g., constant instead of Constant), it appears in ASCET.
If two subkinds have identical identifiers, only the first appears in ASCET. The other one is ignored.
If two subkinds have different identifiers, but identical labels, both appear in ASCET. The second one adds an extension _<i> (<i> being an integer number) to the label.

Keep in mind the following when you are using user-defined system constants:

User-defined subkinds of system constants can be selected in the "Kind" combo box of the properties editor.
The resolution time selected for a subkind of system constants overrides the resolution time selected in the target options of your target.
The resolution time Run Time is not supported for ASCET‑SE targets.
If a subkind of system constants is used in a model, but no definition is available in the ASCET options window, a warning is issued during code generation, and the resolution time selected for your target is used.
WMdl280 – User defined System Constant "<name>" uses missing Kind "<userdef_systemConst_identifier>" – Target Settings are used for resolution time
This warning is promoted to an error by default.
The missing subkind is shown as %ID% <missing> in the ASCET user interface.
If you export a model with user-defined subkinds of system constants to ASCET V6.4.1 or lower, the kind of the affected elements is set to System Constant.