Using a PXI 6608, the creation of a 60kHz pulse train seems problematic as all I can see involves divison of the 10MHz clock, and 60kHz isn't an integer.
I understand the idea of using two clocks to get a non integer frequency, but is there any code examples?
You can get close to 60KHz. The period of the 80MHz clock is 12.5ns. The period of a 60KHz signal is 16.667ms. So the 60KHz signal is about 1333 periods of the 80MHz clock. This is within 0.025% of 60Khz using only one counter. You can set the number of periods in LabVIEW using the example Generate Pulse Train (NI-TIO).vi.