How to limit x to be > y always in x+y

[AlfredoT]

Hello:

In the following simple vi, how do I limit the value of x to always be greater than y?

For instance, if I set y = 10 then x cannot be set to a value less than 10. The values for x and y should remain changeable.

Thanks.

[tbob · Accepted solution]

Use the In Range and Coerce function.  Set the lower limit to Y, infinity for upper limit, and wire the coerced output as X.

[AlfredoT]

Thanks a bunch!

Now for a related question: I see that the function you suggested has a true/false output, perhaps I can use it for the following.

If I set x to be less than y (say x = 5 and y = 10) and I would like the value of x to not be allowed to be 5 but go straight to y if this is the case (o that x automatically sets to y when x<y), how would I accomplish this? Thanks.

[tbob]

---

AlfredoT wrote:

If I set x to be less than y (say x = 5 and y = 10) and I would like the value of x to not be allowed to be 5 but go straight to y if this is the case (o that x automatically sets to y when x<y), how would I accomplish this? Thanks.

---

That is exactly what the coerced output does.  It will set the input (x) to either the high limit or the low limit (Y).  In this case, x is lower than the low limit, so the coerced output will be equal to the lower limit.  In whatever code you use X and Y as inputs, use the coerced output instead of X.  No additional code needed.

My Labview is down, waiting for a license, so I cannot give you an example.  I hope this is clear enough.

[AlfredoT]

I understand what you mean because I have tested it. Thank you.

What I meant was something slightly different: I would like the value of x on the display to change from the value < y to y. I understand that the coerced output will be as such but the displayed x remains whatever value < y I had set it to.

[tbob]

Create a local variable for the X control (right click on control and select create - local variable).  Wire the coerced outptut to the local variable.  If you get a broken wire, right click on the local variable and select Change to Write.

[AlfredoT]

Perfect!

Thank you. I wish I had thought of that.