When you add a masked library block or a Subsystem block from a Library to a Simulink® model, a referenced instance of the library block is created. Such referenced instance of a library block is a called a linked block and contains link or path to the parent library block. The link or path allows the linked block to update when the library block is updated.
To locate the parent library block of a linked block, right-click the block and select Library Link > Go To Library Link (Ctrl + L). The Go To Library Link option is available only for the blocks that are linked and not for the Simulink built-in blocks. To prevent unintentional disabling of links to a library, use the locked links option on the library. For more information, see Lock Links to Blocks in a Library.
Note: The tooltip for a linked block shows the name of the referenced masked library block.
When you edit a library block (either in Simulink Editor or at the command line), Simulink updates the changes in the corresponding linked blocks. The outdated links are updated when you:
Simulate or update the model.
Diagram > Refresh Blocks (or press Ctrl+K)
Load the model or library (only visible links are updated).
get_param to query the link
status of the block (see Control Linked Block Programmatically).
You can use the
Selective usage of
You can change the values of a linked block parameter (including the existing mask).
Note: The Allow library block to modify its contents check box in the Initialization pane of the library block must be selected.
You cannot set callback parameters for a linked block.
If the reference library block of a linked block is a subsystem, you can make nonstructural changes such as changing the parameter value of the linked subsystem. To make structural changes to a linked block, disable the link of the linked block from its library block (See Disable or Break Links to Library Blocks).
Parent library block
Library block from which the linked blocks are referenced.
Reference instance of a library block that contains links or path to its parent library block.
Prevents unintentional modification of a linked block. For more information, see Lock Links to Blocks in a Library.
Library links that are temporarily disconnected from their parent library block. For more information, see Disable or Break Links to Library Blocks.
Restores the disabled link of a linked block to their parent library block. For more information, see Restore Disabled or Parameterized Links.
Permanently breaks link of a linked block from its parent library block. For more information, see Disable or Break Links to Library Blocks.
Linked block with the ability to have structural changes in a linked Subsystem block. For more information, see Self-Modifiable Linked Subsystems.
Created when the parameter values of a linked block are modified through MATLAB® command prompt. For more information, see Parameterized Links and Self-Modifiable Linked Subsystems.
Maps old library block path to new library block path. For more information, see Forwarding Tables.
Corrects the mismatch of parameters in the