Generating a gate function

Hi!
I have read the postings but not related to mine though appear similar
Moreover, i knew that there is a simulation for step signal. But, i cant use it. The graph is in waveform chart, whereeas I want it to b in waveform graph.
How to generate a tunable output gate function and with control over initial time and final time?
tuneable means controllable time domain.
1) By the Use of the step function.vi
Please help...

i still dun have it.
Attachments:
Untitled 12.vi ‏24 KB

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Generating a gate function

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