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About Block Indexes
Many Simulink debugger commands and messages use block indexes to refer to blocks. A block index has the forms:b where s is an integer identifying a system in the model being debugged and b is an integer identifying a block within that system. For example, the block index 0:1 refers to block 1 in the model's 0 system. The slist command shows the block index for each block in the model being debugged (see slist).