When you open the Variables tab of a block
dialog box, it lists all the public variables specified in the underlying
component file, along with priority, target value, and unit. In most
cases, the default value for each of these is
For example, if you add a Translational Spring block
to your model, double-click it to open its dialog box, and then click
the Variables tab, it looks like this:
For details on these variables and their usage in the block equations, click the Source code link in the block dialog box to view the underlying Simscape™ source file. The Source code link is available for all the Foundation library blocks that have a Variables tab.
To specify the initial deformation of the spring, select the
check box next to the Deformation variable. Once
you select the check box next to a variable, its Priority changes
High, while Value and Unit assume
the values specified in the variable declaration in the underlying
Type a new number into the Value field
and change the unit, if desired. The Unit drop-down
lists contains all the units defined in the unit registry that are
commensurate with the one specified in the variable declaration. You
can also change the priority from
In the following dialog box, Deformation is specified
as a high-priority variable with the initial target of 20 mm.
If you clear the check box next to a variable name, its Priority, Value,
and Unit fields switch to
However, if you select it again, these fields will retain their last
specified value for when they were in use.