How to connect boolean case structure to multiple channel digital output?

[allen716]

Hello,

I can connect the case structure to a single channel of digital output. Then I want to control two digital output channels at the same time, I connected the case structure to multiple channels, but it told me I connected two different types.

My question is: How can I connect the case structure to multiple channels?

Thanks a lot.

[altenbach]

(It is difficult to debug pictures. we prefer to see the actual VI.)

Obviously, unders some settings, your IO wants an array of booleans, but your case structure outputs a scalar. Round peg, square hole!

You need to decide what you want and create the appropriate output. we don't know what that would be based on a single comparison. Also be aware that your code seems dangerous. Wiring a DBL to a case structure rounds to the nearest integer, so if your signal is betweeen about -0.5 to 0.5, it is considered zero. What's in the other case(s)? Why is there a sequence structure? Why are the wires such a mess?

[allen716]

Dear Sir,

Please check the attached file.

I want to control line0:2 by the case structure at the same time. How to solve this problem?

Thanks a lot.

[altenbach]

Instead of asking how to connect incompatible datatypes, take a step back and tell us what the program is supposed to do:

• What are typical default values for all controls (e.g. LED on and LED off numerics)? All controls should have typical default values.
• Under what conditions should the VI stop (Wiring a continue if true to a comparison does not make it obvious)
• You are reading a single DBL and creating a boolean out of it. I doubt you need a case structure and two comparisons for that.
• If you have three LEDs and they should all go on/off at the same time, just take your boolean and make it into a boolean array with 3 elements. Do you know how to do that?
• Again, why don't you leave the hardware out of it and do a simulation instead (e.g. using a slider for the reading and a few booleans (or a boolean array) as output. Test it until everything works as expected.
• Your loop has no obvious timing. What would you think is a typical loop time?