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Input is divided into two basic types: discrete and analog. In terms of circuit, analog quantity is mainly composed of internal analog-to-digital conversion circuit; Discrete quantity acceptance

Is a level signal, only used to distinguish the voltage level and AC /DC.

Output is also divided into two basic types: discrete quantity and analog quantity. From the circuit point of view, analog quantity is mainly composed of internal digital-to-analog conversion circuit; disconnected

It is divided into three outputs: transistor, thyristor and relay.

Only voltage level and AC /DC are distinguished.

Output is also divided into two basic types: discrete quantity and analog quantity.