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A Simulink Identifier (SID) is a unique identifier automatically assigned to a Simulink block, model annotation, or a Stateflow object within a Stateflow chart. The SID has the following characteristics:
Persistent within the lifetime of a Simulink block, model annotation, or Stateflow object.
Saved in the model file.
If the name of a block or object changes, the SID remains the same.
You cannot modify the SID.
The SID format is
model_name:sid_number
where
model_name is the name of the model where the block, annotation, or object resides
sid_number is a unique number within the model, assigned by Simulink
![]() | Simulink Identifier | Model Advisor Checks | ![]() |

Learn more about Simulink through this collection of videos, articles, technical literature and the Getting Started with Simulink Guide.
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