Mounting 3 pairs of omron sensor E3X-F21 at 25mm intervals to measure time taken by moving object breaking beams and connecting to 6601 counter/timer card

Question

System is Windows ME Labview 6.1 6601 Counter/timer card. 3 pairs of Omron Photoelectric sensors E3X-F21 are mounted on a flat surface and as the object passes the first pair of sensors it starts timer1 and timer2.
As the object passes the second pair of sensors it stops timer1 and as the object passes the third pair of sensors it stops timer2
We have a known distance between the sensors so we are able to calculate the objects speed and position.
We need a wiring diagram to connect the sensors to the 6601 card.

Answer 1

I think I can describe a method that'll probably be simpler than the previous answer because it won't require any external logic circuitry.
1. Configure two counters for "Two-Edge Separation" measurement, let's say counters 0 and 1.
2. Wire Sensor 1's signal to both AUX-0 and AUX-1.
3. Wire Sensor 2's signal to GATE-0.
4. Wire Sensor 3's signal to GATE-1.
5. Wire each sensors' 'ground' to the appropriate ground pins on your terminal block.
6. Software configure both counters to use "max internal timebase" for a source -- 20 MHz for the 6601.
You can specify the polarity of the transition you care about for both the AUX and the GATE signal, but I'll explain in terms of rising edges for both.
Counter 0 will count time from Sensor 1's rising e
dge until Sensor 2's rising edge. Counter 1 will count time from Sensor 1's rising edge until Sensor 3's rising edge. The count values will be in units of "# of 20 MHz cycles elapsed."
You can probably get a decent starting point on the software using one of the shipped examples.