DI Field Interface Modules used to Interface between PLC /DCS Digital Inputs to field or field devices such as Proximity sensors, Limit switch i.e. Potential free contacts etc
DO Relay Interface Modules used for Interfacing PLC /DCS digital outputs to field or field devices such as Contactor, Solenoid Valve, Motors etc. Outputs are galvanically isolated through Relays.
AI Field Interface Modules used to Interface between PLC /DCS Analog Inputs to field or field devices such as Proximity sensors, Limit switch i.e. Potential free contacts etc
AO Field Interface Modules used to Interface between PLC /DCS Analog Output to field or field devices such as Proximity sensors, Limit switch i.e. Potential free contacts etc