What are the different types of sensors signals?

1)Analog signal 

2) Digital Signal- Discrete (ON/OFF)

There are mainly two types of signal

1) Analog (eg 4-20 MA)

2) Digital (eg 0-1 / 0 or 5 v)

Active signals(Measuring signal)

Passive signals(Sourcing signal)

Digital signals

Analog signals

There are two different types of sensor signals i.e Analog & digital. In analog pressure sensor, temparature sensor, sound sensor included. In digital Temparature sensor (DS 1620), Digitall accelerometers included.

electrical or optical signals

1- digital sensors (on\\off) like limitt switch 

2- analog sensors (0 to 5 volt) like RTD 

Digital sensors like switches always have discrete output ( high or low ).

While Analog sensors have different types of output signals (0-20 mA, 4-20 mA, 0-10 V, 0-5 V etc) 

current signal

voltage signal

Digital Signals .Analog Signals .