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PLC (Programmable Logic Controller) Overview

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Questions and Answers

What is the primary purpose of a PLC?

To conduct military applications efficiently
To design complex computer programs
To monitor process parameters and adjust operations (correct)
To control actuators only

Why are integrated PLCs sometimes referred to as 'brick PLCs'?

Referring to the construction material of the housing
Due to their large size and bulky nature
Because they are made of actual bricks
Because of their small size and compact nature (correct)

How are ladder diagrams typically created in a PLC?

By using specialized graphical software
By writing code in C++
By drawing lines and devices on a display screen with a keyboard/mouse (correct)
By connecting external hardware components

What is the function of a programming unit in relation to a PLC?

To create, edit, and download user programs to the PLC (A) Signup and view all the answers

In the context of PLCs, what is the purpose of communication adapters for remote I/O devices?

To facilitate network communication for I/O devices that are at a distance from the CPU module (D) Signup and view all the answers

How did PLCs contribute to reducing downtime during model changeovers in automotive plants?

By eliminating the need to physically rewire relay and control panels (D) Signup and view all the answers

What advantage does increased technology offer when it comes to PLCs?

Condenses more functions into smaller and less expensive packages (A) Signup and view all the answers

How does visual observation benefit troubleshooting in PLC circuits?

Allows for real-time observation of circuit operation on a CRT screen (D) Signup and view all the answers

What is an advantage of using a solid-state device in PLCs as opposed to mechanical systems?

Higher reliability and lower maintenance costs (A) Signup and view all the answers

How does documentation in PLC systems differ from traditional methods?

Immediate printout of the true PLC circuit is available in minutes (C) Signup and view all the answers

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