Answer Posted / mathan.j

Analog card means the signals may interms of 4-20 ma , 1-5 v
ie variable source of signals.
Digital cards means the source of signals may interms of
binary o & 1, no & nc contacts ie 24v or 0v.

for example transmitters are produce 4-20 ma ,and it is
called analog input.

limit switches ,On & Off switches are called digital
signals.

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