block diagram error

[rosinah]

Hi

I'm doing charge discharge cycle of battery using labview 2011.. On the block diagram, I using Formula Node to change the charge discharge operation when the battery reach certain level...the battery is connected to input DAQ assistant.. but when i connect the input DAQ assistant to formula node, an error appear....

Block Diagram Errors
-You have connected two terminals of different types.

Details
These cannot be wired together because their data types (numeric, string, array, cluster, etc.) do not match. Show the Context Help window to see what data type is required.
The type of the source is Dynamic Data.
The type of the sink is double [64-bit real (~15 digit precision)].

please help me....

[rosinah]

My block diagram picture as reference...

[yenknip · Accepted solution]

You have mismatched data types. You need to convert from the express datatype to dbl

[Yamaeda]

What happens if X is between 1 and 5? Y1 and Y2 = 0?

That logic is easily (and better) done in LV. 

/Y 

[rosinah]

how to convert the express datatype to dbl??? can you show me... 

[rosinah]

if x=1, battery will charge until 5...if x=5, battery discharge until 1...y2=0 only show the charge/discharge waveform...

[rosinah]

I already got the solution....thank you yenknip and yameada for helping me...thanks a lot

[Yamaeda]

Your second formula node makes no sense, it just changes the name of the variables. Simply move the Else to the 1st one and use those outputs.

/Y