What does PLC stand for?

• Programmable Logic Circuit

• Programmable Logic Controller

• Programmable Linear Controller

• Programmable Linear Circuit

Before PLCs, what was primarily used for control systems?

• Digital circuits

• Microprocessors

• Solid-state electronics

• Banks of relays

How do PLCs typically make decisions?

• By trial and error

• Through manual intervention

• Using a stored set of rules

• Based on random inputs

What type of input provides information on whether something is on or off?

• Variable input

• Continuous input

• Digital input

• Analog input

Which component of a PLC is considered the 'brains' of the operation?

• Input module

• Output module

• Central Processing Unit (CPU)

• Memory chip

What is the purpose of a memory chip in a PLC?

• To convert analog signals

• To provide power supply

• To store the program and output history

• To process input signals

What is the first stage in the basic operation of a PLC?

• Output update

• Input scan

• Housekeeping

• Program scan

In a PLC-controlled heating system, what does the optimizer software do?

• It learns the building's heating and cooling patterns

• It only controls the lighting system

• It operates without any input from sensors

• It turns on the heating system randomly

What is one advantage of using PLCs over traditional relay banks?

• PLCs are larger in size

• PLCs require more physical wiring

• PLCs are easier to reprogram

• PLCs are more difficult to fault-find

How can PLCs be expanded for more inputs and outputs?

• By installing additional cards

• By using larger CPUs

• By adding more physical wires

• By increasing the power supply