For Loop with Error Check

[Munna232]

Hello all,

As per my sample VI.

I gave   Empty array to For Loop. As we know this Loop will not execute because N value “0”.

But, I want to know why Error out always giving True value. This Error Indicator value changing to “True” irrespective of Error In.  

 BR,

Munna

[Munna232]

Sorry I forgot to attach

[altenbach]

Attach the VI instead of a picture. I cannot reproduce your observation.

(The error out will only give a true of you would keep the error in a shift register instead of plain tunnels, and only because your error diagram constant is set to true for some reason)

[Munna232]

Check this Sample VI.

In both the cases ForLoop is not executing but Output Error is not same.

[altenbach · Accepted solution]

That''s exaclty what I said.

• If you use plain tunnels and the loop iterates zero times, the output will give the default value for the datatype, which is FALSE for errors.
• If you use shift registers, whatever is wired to the initializer terminal will be output unchanged on the right if the loop iterates zero times. Since you initialize with a error=TRUE, that's what you get.

This is all as expected. In your first post you claimed that the output is error=true using plain tunnels, which cannot be. Agreed?

If you want error=false with the shift register, change the diagram constant accordingly.