How to create a block diagram that will increment a value?

I am working on a cable robot simulation where I am required to increment a value which I'll use inside a matlab function block.

How can I form an incremental block diagram for the system that I have given below.

I want the k value to have increments in either plus 0.1 or negative 0.1

Answer 1

[Fangjun Jiang]

A counter block, multiplied by 0.1 or -0.1

[Fazil Doruk Inanc]

It didn't work. I don' t know if it is of any use but I am using discrete solver with fixed-step of 0.0001.

[Fangjun Jiang]

That means the counter is going to increase by 1 every 0.0001 second. How do you want the k value to increase, increase by 1 every 1 second? You can set the sample time of the counter block.