Que: What is the difference between analogue input and analogue output?
Ans:
Analogue input: which gives continuously signal from field to plc.
Examples: Level sensor, pressure sensor, temperature sensor (RTD, thermocouple etc)
Analogue output: giving continuous command from plc to field.
Examples: VFD
Que: What is the difference between digital input and digital output?
Digital input: means giving feedback to PLC.
Examples: feedback about status of the motor is on or off or trip in condition.
On/off, trip, level switch, pressure switch, emergency stop, hooter accept push button, phase failure relay trip feedback etc.
Digital output: means giving command to start from the PLC.
Examples: giving command to start or stop the motor.
Motor, valves, hooter etc .
Que: What is the meaning of analogue Signal?
Ans: Analogue means continuous signal.
4-20 mA, 0-10vdc, 0-5vdc
Examples: VFD to control the speed of motor, Level sensor, pressure sensor, temperature sensor (RTD, thermocouple etc)
Que: What is the meaning of Digital Signal?
Ans: Digital means either 0 or 1, on/off, yes/no.
Examples: Either start or stop the motor,
level switch, pressure switch, valves etc.
Comments