Understand the PLC I/O types with our top questions on AI, AO, DI, and DO for learning automation and control technologies
AI, AO, DI, DO Questions
The following video provides detailed explanations for the PLC IO questions.
Question 1
A thermocouple connected to a PLC is an example of which type of signal?
A. AI
B. AO
C. DI
D. DO
Show the Answer
AI
Question 2
What type of I/O device is a push button when used in a PLC system?
A. DI
B. AI
C. AO
D. DO
Show the Answer
DI
Question 3
A variable frequency drive (VFD) receiving signals from a PLC is classified as? (from PLC point of view)
A. AO
B. AI
C. DI
D. DO
Show the Answer
AO
Question 4
Which type of signal is provided by a limit switch to a PLC?
A. DI
B. AI
C. AO
D. DO
Show the Answer
DI
Question 5
Identify the type of device a solenoid valve is when controlled by a PLC.
A. DO
B. AI
C. AO
D. DI
Show the Answer
DO
Question 6
What type of signal does a flow transmitter provide to a PLC?
A. AI
B. DI
C. AO
D. DO
Show the Answer
AI
Question 7
Which type of I/O is a proximity sensor in a PLC system?
A. DI
B. AI
C. AO
D. DO
Show the Answer
DI
Question 8
A PLC controlling an actuator to move a lever is an example of which type of output?
A. DO
B. AI
C. AO
D. DI
Show the Answer
DO
Question 9
What type of signal does a humidity sensor provide to a PLC?
A. AI
B. DI
C. AO
D. DO
Show the Answer
AI
Question 10
Which type of I/O device is an LED indicator controlled by a PLC?
A. DO
B. AI
C. AO
D. DI
Show the Answer
DO
Question 11
What type of I/O device is a load cell when used in a PLC system?
A. AI
B. AO
C. DI
D. DO
Show the Answer
AI
Question 12
A strobe light controlled by a PLC is an example of which type of output?
A. DO
B. AI
C. AO
D. DI
Show the Answer
DO
Question 13
Which type of signal does a pressure transducer provide to a PLC?
A. AI
B. DI
C. AO
D. DO
Show the Answer
AI
Question 14
Identify the type of device a relay switch is when connected to a PLC.
A. DO
B. AI
C. AO
D. DI
Show the Answer
DO
Question 15
What type of I/O device is a photoelectric sensor in a PLC system?
A. DI
B. AI
C. AO
D. DO
Show the Answer
DI
Question 16
A PLC controlling a heating element is an example of which type of output?
A. AO
B. AI
C. DI
D. DO
Show the Answer
AO
Question 17
Which type of signal does a tachometer provide to a PLC?
A. AI
B. DI
C. AO
D. DO
Show the Answer
AI
Question 18
What type of I/O device is a safety light curtain in a PLC system?
A. DI
B. AI
C. AO
D. DO
Show the Answer
DI
Question 19
A PLC controlling a motor speed through a VFD is an example of which type of output?
A. AO
B. AI
C. DI
D. DO
Show the Answer
AO
Question 20
Which type of I/O device is a magnetic reed switch used for position detection?
A. DI
B. AI
C. AO
D. DO
Show the Answer
DI
Question 21
A thermistor used in a PLC system is an example of which type of signal?
A. AI
B. AO
C. DI
D. DO
Show the Answer
AI
Question 22
What type of I/O device is an emergency stop button in a PLC system?
A. DI
B. AI
C. AO
D. DO
Show the Answer
DI
Question 23
A pressure gauge/sensor providing signals to a PLC is classified as which type of input?
A. AI
B. DI
C. AO
D. DO
Show the Answer
AI
Question 24
Which type of I/O device is an actuator controlled by a PLC?
A. DO
B. AI
C. AO
D. DI
Show the Answer
DO
Question 25
What type of signal does a potentiometer provide to a PLC?
A. AI
B. DI
C. AO
D. DO
Show the Answer
AI
Question 26
A pilot light controlled by a PLC is an example of which type of output?
A. DO
B. AI
C. AO
D. DI
Show the Answer
DO
Question 27
Identify the type of device a contactor is when controlled by a PLC.
A. DO
B. AI
C. AO
D. DI
Show the Answer
DO
Question 28
What type of I/O device is a flow meter in a PLC system?
A. AI
B. DI
C. AO
D. DO
Show the Answer
AI
Question 29
Which type of I/O device is a buzzer controlled by a PLC?
A. DO
B. AI
C. AO
D. DI
Show the Answer
DO
Question 30
Identify the type of device an analog voltmeter is when connected to a PLC.
A. AO
B. AI
C. DI
D. DO
Show the Answer
AO
Question 31
What type of I/O device is a strain gauge when used in a PLC system?
A. AI
B. AO
C. DI
D. DO
Show the Answer
AI
Question 32
A flashing beacon controlled by a PLC is an example of which type of output?
A. DO
B. AI
C. AO
D. DI
Show the Answer
DO
Question 33
Which type of signal does an RTD sensor provide to a PLC?
A. AI
B. DI
C. AO
D. DO
Show the Answer
AI
Question 34
Identify the type of device a photoelectric sensor is when connected to a PLC.
A. DI
B. AI
C. AO
D. DO
Show the Answer
DI
Question 35
What type of signal does a digital counter provide to a PLC?
A. DI
B. AI
C. AO
D. DO
Show the Answer
DI
Question 36
A pneumatic actuator controlled by a PLC is an example of which type of output?
A. DO
B. AI
C. AO
D. DI
Show the Answer
DO
Question 37
Which type of signal does an ultrasonic sensor provide to a PLC?
A. AI
B. DI
C. AO
D. DO
Show the Answer
AI
Question 38
Which type of I/O device is a pressure sensor in a PLC system?
A. AI
B. DI
C. AO
D. DO
Show the Answer
AI
Read Next:
- Wiring Diagrams of PLC Systems
- PLC Digital Signals Wiring Techniques
- Micro PLC Hardware Configuration
- Flexible PLC Input Output Modules
- What are AI, AO, DI, and DO?