18 Questions
What is the primary function of an ADC in electronics?
Convert analog signals into digital signals
Which device converts a digital signal into an analog signal?
DAC
In a control system, what role do output devices like relays and contactors play?
Control operating devices such as motors and pumps
What type of signals are discrete signals in a control system?
Digital signals
What is the function of input devices like switches and thermostats in a control system?
Sense specific conditions of a process or system
Which component of a control system receives information and decides on a response?
Processor
What is one of the advantages of PLCs that contributes to reducing expensive downtime?
Programs can be changed without any changes in hard-wiring.
How do smart relays control an electrical circuit?
Via the network.
What feature of PLCs makes them reliable in industrial environments with excessive heat and humidity?
STATIC electronic switching with no moving parts.
How does the programmability of PLCs differ from traditional electromechanical relays?
Control programs in PLCs can be changed without rewiring.
What aspect of PLC systems allows for easy troubleshooting and logical testing during operation?
Programmable ladder logic displaying device status and power flow.
In what way do most PLC systems provide an advantage in terms of expandability?
Components can be easily added to the system due to modular design.
What type of signals does a discrete input device sense or send?
Digital signals
Which component of a PLC sends a discrete digital signal to the PLC?
Discrete Input Device
What is one of the main purposes of a programmable logic controller (PLC) in an industrial setting?
To perform internal diagnostics and analysis
Which characteristic is essential for a device to be considered a programmable logic controller (PLC)?
Ease of programming
How do PLCs vary in terms of I/O points they can serve?
They can range from tens to thousands of I/O points
What primarily influences the selection of a PLC according to the text?
The number of Inputs & Output points it can serve
Test your knowledge on digital signals, discrete input and output devices, and the evolution of Programmable Logic Controllers (PLCs). Learn about how PLCs have replaced control relay systems with more efficient and flexible solutions.
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