Simulink Reference

Common Block Parameters

This table lists the parameters common to all Simulink blocks, including block callback parameters (see Using Callback Routines). Examples of commands that change these parameters follow this table.

Table 8-2: Common Block Parameters 

Parameter	Description	Values
AttributesFormat String	Specifies parameters to be displayed below block in a block diagram	string
BackgroundColor	Block icon background	black | {white} | red | green | blue | cyan | magenta | yellow | gray | lightBlue | orange | darkGreen
BlockDescription	Block description	text
BlockType	Block type	text
CloseFcn	Close callback	MATLAB expression
CompiledPortWidths	Structure of port widths	scalar and vector
CopyFcn	Copy callback	MATLAB expression
DeleteFcn	Delete callback	MATLAB expression
Description	User-specifiable description	text
DialogParameters	Names/attributes of parameters in blocks parameter dialog	structure
DropShadow	Display drop shadow	{off} | on
FontAngle	Font angle	(system-dependent) {normal} | italic | oblique
FontName	Font	{Helvetica}
FontSize	Font size A value of -1 specifies that this block inherits the font size specified by the DefaultBlockFontSize model parameter.	{-1}
FontWeight	Font weight	(system-dependent) light | {normal} | demi | bold
ForegroundColor	Block name, icon, outline, output signals, and signal label	{black} | white | red | green | blue | cyan | magenta | yellow | gray | lightBlue | orange | darkGreen
InitFcn	Initialization callback	MATLAB expression
InputPorts	Array of input port locations	[h1,v1; h2,v2; ...]
LinkStatus	Link status of block	none |resolved | unresolved | implicit
LoadFcn	Load callback	MATLAB expression
ModelCloseFcn	Model close callback	MATLAB expression
Name	Block's name	string
NameChangeFcn	Block name change callback	MATLAB expression
NamePlacement	Position of block name	{normal} | alternate
ObjectParameters	Names/attributes of block's parameters	structure
OpenFcn	Open callback	MATLAB expression
Orientation	Where block faces	{right} | left | down | up
OutputPorts	Array of output port locations	[h1,v1; h2,v2; ...]
Parent	Name of the system that owns the block	string
ParentCloseFcn	Parent subsystem close callback	MATLAB expression
Position	Position of block in model window	vector [left top right bottom] not enclosed in quotation marks
PostSaveFcn	Postsave callback	MATLAB expression
PreSaveFcn	Presave callback	MATLAB expression
Selected	Block selected state	on | {off}
ShowName	Display block name	{on} | off
StartFcn	Start simulation callback	MATLAB expression
StopFcn	Termination of simulation callback	MATLAB expression
Tag	User-defined string	' '
Type	Simulink object type (read-only)	'block'
UndoDeleteFcn	Undo block delete callback	MATLAB expression
UserData	Any MATLAB data type	[ ]
UserDataPersistent	Save UserData in the model file.	on | {off}

These examples illustrate how to change these parameters.

This command changes the orientation of the Gain block in the mymodel system so it faces the opposite direction (right to left).

• set_param('mymodel/Gain','Orientation','left')
  

This command associates an OpenFcn callback with the Gain block in the mymodel system.

• set_param('mymodel/Gain','OpenFcn','my_open_cb')
  

This command sets the Position parameter of the Gain block in the mymodel system. The block is 75 pixels wide by 25 pixels high. The position vector is not enclosed in quotation marks.

• set_param('mymodel/Gain','Position',[50 250 125 275])
  

Model Parameters

Block-Specific Parameters