TWO ENUM ONE LV

[labview1958]

I have two enums in my LV. I want to RUN only one enum. How do I do that? I also have errors like select tunnel: missing assignment to tunnel. What shall I do? Thanks.

The LV in 6.0 is attached.

[mikeporter]

I'm not sure what you mean by running an enum, but to fix the errors is easy. When a wore passes through the wall of a case structure you have to define an output value for every case in the structure. So you have two choices, define values for the other case OR move the indicators and the subvi inside the case structure (which look like is the one you would want to do). See attached screenshot...

Mike...

[labview1958]

I have two enums. One select the motor for FORWARD or REVERSE movement. The other selects whether to take READINGS or not. I do not want the motor to move while the readings are being taken. Which enum selection the LV will run, the motor direction or take the readings selection. Is it possible to combine the two enums into one?

[becktho]

There is no problem to make one enum with all you values, but I would not do it.

The program is more readable if you have different enums which concentrate on one "topic" (just an example: Enum "MotorControl" / Values Forward, Reverse, Stop). I think this is much better than to have one enum conataining all values (e.g. Enum "General" / Values Forward, Reverse, Stop, Read, No Read).

[labview1958]

If there are TWO enums, how does LV knows which selection to execute?

[becktho]

How do you mean that? Do you want to connect two enums to one case-structure?

This won't work. You will have to put one case-structure into another.

[labview1958]

I have already put one case structure into another. I still have two ENUMS. When I select something from ENUM A and not from ENUM B, how does LV execute. My selection from enum A or from enum B or BOTH? The vi is attached in LV6.0

[labview1958]

Sorry. The vi is now attached.

[becktho]

It is executed as you wired it. Each time your vi runs the cases are executed depending on the values.

The inner case structure just executes, if you select "MOTOR" of enum "Readings". If you select "READINGS", the readings-case is executed.

I'd suggest you to simpli build the case-structures with the enums in another vi, execute it in highlighting mode and observe what happens in which case.

[GerdW]

Hello labview1958,

LabView is dataflow based:
So it will run your vi from the outer case to the inner. This way first the enum "Readings" will be checked (outer case structure), then enum "Motor direction" (inner case structure). But you cannot change "Motor dir" after "Readings" has been read as you both wired them from outside the outer case (dataflow!). And "Motor dir"/inner case structure will only be processed if "Readings" is set to "Motor".

So maybe you have to changed your vi to:
1) move the communication part into subvi's (moving motor, reading data)
3) do motor moving and reading in parallel loops
2) check "Readings": if set to "Reading" then stop motor moving (in parallel loop), do reading, start motor moving again

Hope this helps.