Simulink simulation output at Zero second doubt

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I have done the following simulink model. One with direct addition of constant blocks and the other addition with a unit delay in between. In the first case the output (2) is available in the 0th second but the block with unit delay the output is available at 0.2 seconds, but i expected 1 at 0th second. why there is no output at 0th second. Please help. I am a beginner.

Accepted Answer

Azzi Abdelmalek
Azzi Abdelmalek on 8 May 2016
Edited: Azzi Abdelmalek on 8 May 2016
I ran your model, and it shows the value 1 at 0 sec. Also, the output is always available, even when the output is equal to 0. Zero is a value.

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