can I use two chasses and two 9401s for more counting channels?

Hi,

I am currently using cDAQ9174 and NI 9401 and the four counters in the chassis to measure the periods of 4 separate (simultaneous) encoders in a vi.  All four encoders are running at the same time, and the vi measures them all in a single execution; not truly simultaneously, but, within the timing of a WHILE loop.  Actually, I suppose it measures the periods in a serial fashion.

I want to add more encoders to my hardware system, and measure their periods within the same vi.  So, can I add another chassis and another 9401, and measure periods of up to 8 encoders this way within the same vi on the same PC?  Will the vi recognize more counters than a single chassis has?

Will I face new errors with lots of encoders?

Thanks,

Dave