Analog inputs provides 12 bits 1 in 4096
Analog Output 10 bits 1 in 1024
The I/O are wired in card files and racked in electrical
cabinets, most often located in a shelter remote from the
operator control room.
Industrial grade can handle harsh environments,
electrical noise transients, radio interference, etc.
IEEE C37.90.1-1989 was called 472; defines an
electrical test that standardizes these conditions.
Electrical Grounding - usually "isolated" from the plant
ground system, however it is connected at one point.