continuously Read 2 Excel files in different time interval

[oahchao]

Hello, I'm new to LabVIEW and current meet a problem with my program.

My topic title is not so accurate, sorry about it :headbang:

I draw a simple block diagram here for easy understanding.

the Read Data Program using ActiveX to read data from Excel .xls file

Wait Time t1 may not equal to Wait Time t2, t1 and t2 may not be constant as well

t1 comes from Excel file A and t2 comes froms Excel File B.

My problem is:

Because t1 and t2 are not equal, i cannot use a single While loop

and if i use 2 While loops for 2 Read File Sub-programs, Y will not be send out till the end of While Loop.

and for the Instrument Control Program 1, every time X(from File A) or Y(from excel B) changes, it need to be updated.

Can I have any suggestion from you guys?

Thanks a lot!!!!

Best Regards

Oahcchao

[Aitor Solar]

You can use queues and notifications to send data between independent loops. They are in the synchronization palette and are an easy solution: just send the data from any loop and wait for it in another. Queues admit any number of elements waiting to be retrieved, notifications just one.

Saludos,

Aitor

[Mike Ashe]

Look in the /examples/general/queue.llb for examples on using the queues. You probably will be able to just modify one of these.