Allowing no more than 1 invocation of a simulink block (that does I/O) in a model.

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I created an embedded target for the stm32f4 discovery board.
It has several blocks that control I/O devices, e.g. reading an ADC.
There often should be no more than 1 invocation of such a block in a model.
The question is, how can enforce this. E.g. that an error is displayed if i try to put a second block in the model. Maybe some trickery with callback functions? Or is there a better way to do this.
Thanks in advance,

Accepted Answer

A Jenkins
A Jenkins on 20 Jan 2015
Make that block its own model. Reference the block from your top level model. Then set the "Total number of instances allowed per top model" of your I/O block.

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