10 Analogue and digital input devices Quiz

What type of signals are most input signals connected to a PLC likely to be?

• Analog

• Digital

• Continuous

• Variable

What does it mean when a signal is described as binary?

• It can have multiple states

• It is always on

• It is either on or off

• It is always off

How are digital input signals typically produced?

• By a sensor

• By a switch mechanism

• By a motor

• By a light source

What type of output do analogue sensors produce?

• Discrete output

• Continuously variable output

• Digital output

• Binary output

What device is used to monitor the position of a motor and produces an analogue output?

• Thermistor

• Resistor

• Potentiometer

• Capacitor

What is required for a PLC to read an analogue signal?

• Standard wiring

• Analogue to Digital convertor

• Digital to Analogue converter

• Basic software

What capability might a PLC have built-in as standard?

• Digital input capability

• Analogue input capability

• Wireless communication capability

• Output capability

What does ADC stand for in the context of signal conversion?

• Analogue to Digital Conversion

• Advanced Data Control

• Automatic Data Conversion

• Analogue Data Coding

Which factor affects the numeric value returned from the conversion of an analogue input signal?

• The color of the signal

• The converter’s resolution (the number of bits used)

• The type of cable used

• The temperature of the environment

Which of the following is NOT a factor affecting the numeric value from an analogue signal conversion?

• The level of signal applied

• The type of signal modulation

• Any scaling performed by the PLC

• The range of input signal supported