Analog I/O's

[Nilesh Sinha]

When considering analog I/O's, for what applications shud one consider differential I/O's, and what is the basic difference between the single ended analog input modules and differential input modules w.r.t application. Where can we consider single ended input modules.

 

[Ken Moore]

1.
Signal noise and noise propagation.

With single ended I/O if you have noise on one channel the noise will affect all signals on the card through the common.

2. With single ended I/O modules you cannot mix power sources, with differential you can. So.... If you have a mixture of 2-wire and 4-wire devices, you cannot use single ended.