Simulink doesn't let me connect blocks

I'm facing a big problem with simulink. If i want to connect for example a step with a normal black line it doesn't let me do that. How can i do? The problem is the same for every block, when I want to connect the output of a block to a black line, I can't !!!! Please help me, I'm desperate. I've tried everyhthing, i've also reinstalled matlab two times, but the problem didn't vanish.
Let me show you with a figure..

Answers (1)

Azzi Abdelmalek
Azzi Abdelmalek on 9 May 2014
Edited: Azzi Abdelmalek on 9 May 2014
You can't connect a signal to a signal, but you can connect a signal to a block.
What do you want to do with these two signals? sum? product? or what?

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Asked:

Max
on 9 May 2014

Edited:

on 9 May 2014

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