Analog module 8bits VS 12 or 14bits

i'm looking for a working solution and a 4in/2out module exist on my setup but it is a 8 bit only resolution. I usually use 12 or 14 bits that worked fine and i don't want to go into throubles.

IM not sure what it really mean in term of calculated resolution....can someone tell me how i can figure it out

is it: 2 exp 8 to give 256 meaning my range can only vary from 1 to 256 and meaning my values will move by step of 0.39% only ?

Jeff,
That's correct.

8-bit resolution gives you 0-255.
12-bit resolution gives you 0-4095.
14-bit resolution gives you 0-16383.
16-bit resolution gives you 0-65535.

The formula for percent change per step is:

1 / (max value) * 100 = % change

As your bit-count increases, your resolution increases; each increase/decrease in value represents a finer step in the value of your analog signal.

-rpoet

ok so i will spend a little more monney on buying my usual separate
8 Ai and Ao then using this 4ai/2ao 8 bit module....

I expect not enought resolution on this project....