How to capture motor position periodically? Time interval not position related

[jaja]

I am working on a project which needs to capture positon of 3 motors every 20--100 microseconds. Is there any way to do that? What is the highest rate? I am considering using a while loop to locate motor. But it seems that the highest rate is 1 milliseconde.
I am using PCI7344 cotroller, software -- labview.


Thanks

[algames]

Copy of a previous question I answered. Please look at that question for the repsonse.