triggering a pulse signal

Goodmorning to all,

I would like to create a simulink model where a boolean true triggers a pulse signal that lasts a precise n. of periods, even if in the meanwhile the trigger goes off. Does anyone know how to do it?

[Nagasai Bharat]

Hi,

Do you mean a single pules with period "n" or n pulses of a particular period are to be generated when the boolean goes true?

[Tommaso Colamartino]

@Nagasai Bharat sorry, I realized now it wasn't so clear.

I've got this true signal of 10ms that can arrive whenever it wants, it could income at simulation time > 0, it depends on an other subsystem; when it arrives, after it switches again from T to F (i.e. 10ms) i want n pulses with given freq exiting my subsys.

I tried with enable subsys but it doesn't seem to work. Any idea?

thanks!

Answer 1

[Nagasai Bharat]

Hi,

I have tried a logic with both enable and triggered subsystems and it seems to work for your use case.

I have attached the Simulink file.

Here in the Triggered subsystem I am trying to get the point when your true signal comes and then this would be passed into the Enabled subsystem where a Counter (Counts the rising edges of the pulse passed to it) is implement with a Switch Block to discards the pulses greater than the number specified.

[Tommaso Colamartino]

@Nagasai Bharat Nice! I don't know why the enabled subsys didn't work for me. Did you change something in the solver?

There is only one problem: if my triggering signal comes at an instant different form a multiple of the period of the pulse generator, I will have the first pulse with a period different from the others. To understand what I'm saying, try to change in the model you sent the step time of the step input with a non-integer number.

is there any possibility to put the pulse inside the enabled subsystem so that it starts when the subsystem is enabled?

Thanks a lot!

UPDATE: I was able to put the pulse gen inside the enabled sys. but it starts counting when the simulation begins, so it doesn't seem to be the solution