how to include a Timer in Simulink?

I need a timer in simulink, in order to trigger an input signal. I want for example have my input signal for the first 5 second out of a 200 sec window, and get zero for the rest of the window. how can I implement this?

Answer 1

[Naga]

To implement this in Simulink, you can use a combination of blocks to create a timer that triggers the input signal for the first 5 seconds of a 200-second window. Here's how you can set it up:

1. Use the Clock block to generate the simulation time.
2. Add a Compare To Constant block to check if the simulation time is less than or equal to 5 seconds. Set the comparison operator to <=. Set the constant value to 5.
3. To ensure the signal operates over a 200-second window, set the simulation stop time to 200 seconds in the Simulink Model Configuration Parameters.
4. Multiply the trigger signal with your input signal. Use a Product block, connect the trigger signal from the Compare To Constant block to one input of the Product block. Connect your input signal to the other input of the Product block.
5. The Compare To Constant block will output 1 for the first 5 seconds and 0 afterward. Multiplying the input signal by this trigger will result in the input signal being passed through for the first 5 seconds. Zero for the rest of the 200-second simulation.

If your input signal needs to be defined as a custom waveform (e.g., sine wave, step function), use the appropriate source blocks. This method ensures that your input signal is active only for the first 5 seconds and remains zero for the remainder of the simulation.