Hello;
The main problem there is going to be the counter triggering. I'm saying that because, there isn't a way for the Analog Input operation to send pulses that will trigger of the timer operation at multiple voltage levels. The only solution for this I can think of is, instead of having an analog voltage level which would indicate the position of xy, if you could have a device which would give a TTL pulse instead when the desired position is reached, then you could use the 6601 to have a triggered operation at the counter. Another constraint for your application right now is the fact that the E-series boards' counters don't have triggering features, only gated features.
Anyway, you would need to have a TTL pulse either to trigger (in case of the 6601 count
ers) or to gate (in case of the E-series board), when the desired XY position is reached.
Meanwhile, you can refer to the Labview examples for Streaming to disk, Analog I/O and counter operations. You can go to Search Examples->I/O Interfaces->Data Acquisition->Data Logger ( for streaming to disk operations); Search Examples->I/O Interfaces->Data Acquisition->Analog Output ( for Analog Output Operations); and Search Examples->I/O Interfaces->Data Acquisition->Counters (for counter operations). Also; I'm including an Application Note which talks about synchronization of multiple DAQ tasks I think will be helpful for you also.
Regards.
Filipe