Simulink Input Array with Trigger

Hi,

I have a question about inputs in Simulink.

I have a model which contains a control inside, and it does some iterations before getting the desired target value. I need to give the input to the system, then it iterates until it reaches the target; afterwards, I need to give the system the following input.

In practice, I want to provide the system with the next input of myinput array only after it has reached the target value for the previous input.

Which is the best way of handling this issue in Simulink?

I apologize if my question is trivial, but I am learning how to use Simulink and I am not an expert.

Thanks in advance,

Emanuele

Answer 1

[Fangjun Jiang]

A simplified example. Make two inputs, one is 5 and one is 10. Inside, Compare output to the first input (5) , if less, pass 5, else, pass 10 (the second input).

[Emanuele Piatti]

Hi,

first of all, I thank you for your help.

Regarding your example, my doubt is about passing the next input when the convergence (with a certain precision) for the previous one is verified.

When you say "pass" the input, which is a practical way of giving an input only after a certain condition is verified (for example, the convergence of the previous input is completed)?

Thank you in advance!

[Fangjun Jiang]

I meant to say the Switch block. The condition is the control signal, which controls to pass down either the first or the second input.

[Emanuele Piatti]

Since I need to pass multiple inouts, one at the time, how can I make it automatic?

[Fangjun Jiang]

In that case, use a 1-D Lookup Table block, for example

table data set as 10:10:50

Breakpoints set as 1:5

Algorithm Interpolation method set as Flat

For any input value <2, the output is 10

for value between 2 and 3, the output is 20,

...

[Emanuele Piatti]

First of all, I want to thank you for the time you are spending to help me.

I still have one doubt: how can I relate the breakpoints of the Look-Up Table to the output of my controlled system? I mean: I give the system an input (with the Look-Up Table), then it iterates until reaching the desired target value; once this is done, how can I automatically set the new input to the Look-Up Table as 2 (3, 4 and so on)?

[Fangjun Jiang]

feed the output of your system (the desired target signal) to the input of the Lookup Table. When the value is anything <2 (2 is your target value), the output of the Table is 10 (which is your first input). When the value reaches 2, the output of the Table is 20 (which is your "the following input").

If your input is some kind of dynamic, you can make the Table output to be an index number such as 1, 2, 3 and then use this index number to control a Multiport Switch block.

[Emanuele Piatti]

Thank you very much, you have been very helpful.