Change the value of a variable based on the status of a bit using function block programming

[pmhpostman 0]

I'm having trouble with some very basic programming using function blocks. Specifically Connect Components FB programming, but I think it is a general, common application.

Using ladder logic, it is easy to set a value based on the status of a bit. If the bit is false, move a zero into the variable. If the bit is true, move and 88.0 into the value. This relies on the enable bit of the mov instruction in ladder logic. Many function block instructions do not have enable bits. How would I change the value of a variable based on the status of a bit using function block programming?

A real world example:

You have a two position selector switch. If it is turned to the left, the drive runs at 0 Hz. (off) if it is to the right, it runs at 88.0 Hz. Or if you have a 4 position selector and want to select between 4 speeds. This should be a simple task, right? I've called the tech connect support line a few times and sent them a few emails and they haven't been able to figure it out. This is such a basic task.

Thanks,

Pat

[a062549 5]

Use a Select statement with an Array(4)

Edited 6 May 2016 by a062549

[Michael Lloyd 85]

You could write your own AOI with structured text and make it do what you want it to.

[pmhpostman 0]

I did find a SEL (Select statement) in RSLogix 5000, but it is not present in Connected components. It would do what I'm looking for though, thanks. 

I could write my own function block in statement list (and one in ladder logic), which I have done, but it seems like if you are programming in function block, you shouldn't need to be writing statement list. If the enable input were there, it would be a lot quicker/easier. Where's the logic in function block? 

I am going to post a more general question about the enable input on function block.

Pat

Edited 9 May 2016 by pmhpostman