Hello Scott,
The simulated PXI 6624, is not going to create specific data you want to simulate. It is there just to allow you to see if the driver will work with the way you are developing your program. So if you want to see if your counter timer application will run you can simply create a counter timer task and then run it. If you are trying to make sure your post acquisition data processing is working the way you expect I would advise you to use the Simulate signal VI, if you are working in LabVIEW, because you will have more control over the kind of signal you will see. If you are having further problems with using your simualted device please let me know.
Have a great day,
Michael D
Applications Engineering
National Instruments