Programmable Logic Controllers
Programmable Logic Controllers
5th Edition
ISBN: 9780073373843
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Chapter 6, Problem 23RQ

Explanation of Solution

a.

Pilot light:

  • Pilot light is an output device which turns ON when the rung to which it is connected completes the continuity and energizes the light...

Explanation of Solution

b.

Relay:

  • Relay is an output device that converts electrical energy into mechanical actions.
  • It turns ON when the rung to which it is connected completes the continuity and energizes the relay...

Explanation of Solution

c.

Motor starter coil:

  • Motor starter coil is an output device used to start the output devices such as motors or other rotating machines.
  • It turns ON when the rung to which it is connected completes the continuity and energizes the coil...

Explanation of Solution

d.

OL relay contact:

  • The Over Load (OL) relay contact is an output module used to protect the output device by preventing excess flow of current into the output device.
  • Whenever excess current is passed through the relay, it simply open its c...

Explanation of Solution

e.

Alarm:

  • It is an output device that turns ON whenever an emergency condition is needed to stop or run the process...

Explanation of Solution

f.

Heater:

  • Heater is an output device that turns ON when it is energized.
  • An electrical symbol used to represent heater is shown below...

Explanation of Solution

g.

Solenoid:

  • The working of solenoid is based on the principle of magnetic induction.
  • It contains a coil, frame, and a plugger known as armature.
  • The main function of solenoid is to convert electrical signals into mechanical motion...

Explanation of Solution

h.

Solenoid valve:

  • Solenoid valve is an electromechanical device which operates on the principle of magnetic induction.
  • It contains a coil, a closed chamber, and an orifice with valve...

Explanation of Solution

i:

Motor:

  • A motor is a rotating machine used to convert electrical energy into mechanical actions.
  • The working of a motor is based on the principle of electromagnetic induction...

Explanation of Solution

j.

Horn:

  • A horn is an output device used instead of a pilot light.
  • The horn will blow when the rung of the horn is energized and maintains the continuity...

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