Signal line lock icon

A lock icon appears on the signal line. What is the meaning of it? , Does it affect my model?

Answer 1

[Mark McBroom]

They mean that there is a data transfer between the source and destination of the line (as those blocks are mapped to different tasks) and this data transfer is set to the “Ensure data integrity”. The lock tried to signify that the generated code will use mutex-es to protect the data during read/write operations.