How can I make Signal Builder output a signal repeatedly, i.e. infinitely?

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Nancy 2014-7-31

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https://ww2.mathworks.cn/matlabcentral/answers/144222-how-can-i-make-signal-builder-output-a-signal-repeatedly-i-e-infinitely

I'm trying to use Signal Builder to generate a custom signal repeatedly--infinitely until I stop execution of the simulation. I can't find anything in the documentation, and setting the time limit to inf results in an error.

I was going to try to edit Signal Builder, putting in a trigger that would restart the block upon a second signal from the block going high, but the right-click menu option to undo the link to the library as well as the entry to look under the mask are both greyed out so I can't edit it.

Any suggestions?