LogixPro PLC Lab Manual for Programmable Logic Controllers
LogixPro PLC Lab Manual for Programmable Logic Controllers
5th Edition
ISBN: 9781259680847
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
bartleby

Concept explainers

Question
Book Icon
Chapter 7, Problem 2RQ
Program Plan Intro

a.

Mechanical timing relays:

  • The main purpose of mechanical timing relays is to delay the opening and closing of contacts for circuit control.
  • Its operation is almost similar to that of a control relay.
  • The only difference is that the contacts of a mechanical timing relay are used to operate at a preset time interval, that is, after the coil is energized or de-energized.
  • One example for mechanical timing relay is Pneumatic timing relay.
  • There are two different arrangements for mechanical timing relays, such as on-delay timer and off-delay timer.
  • Each type will have different kinds of contacts such as closed contacts and open contacts.

Explanation of Solution

b.

Normally Closed Timed Open (NCTO) contact:

The symbol used to represent a NCTO contact is given below.

Explanation of Solution

c.

Normally Open Timed Open (NOTO) contact:

The symbol used to represent a NOTO contact is given below.

  • NOTO contact is an off-delay time based contact...

Explanation of Solution

d.

Normally Closed Timed Closed (NCTC) contact:

The symbol used to represent a NCTC contact is given below.

  • NCTC contact is an off-delay time based contact...

Blurred answer
Students have asked these similar questions
2. Draw the timing diagram for the Clocked SR flip-flop at each of the instants t0 to t6 as described in the class meeting.      a. at t0, Q is low, S is low, R is low      b. at t0, Q is high, S is low, R is low      Be sure to include the clock signal in the timing diagram.
* the state diagram for the following timing diagram is CK a/1 /PS Z e/0 a/1 b/0 f/1 0/p c/0 e/1 c/0 0/P B O A 1 a/1 g/0 b/0 f/1 1 e/1 c/0 1 d/0 None of the above O C
Design a 1-minute timer using a 60 Hz power line as an interrupting source. The output ports should display minutes and seconds in BCD. At the end of the minute, the output ports should continue displaying one minute and zero seconds.
Knowledge Booster
Background pattern image
Computer Science
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.
Similar questions
SEE MORE QUESTIONS
Recommended textbooks for you
  • Text book image
    EBK JAVA PROGRAMMING
    Computer Science
    ISBN:9781305480537
    Author:FARRELL
    Publisher:CENGAGE LEARNING - CONSIGNMENT
    Text book image
    Systems Architecture
    Computer Science
    ISBN:9781305080195
    Author:Stephen D. Burd
    Publisher:Cengage Learning
Text book image
EBK JAVA PROGRAMMING
Computer Science
ISBN:9781305480537
Author:FARRELL
Publisher:CENGAGE LEARNING - CONSIGNMENT
Text book image
Systems Architecture
Computer Science
ISBN:9781305080195
Author:Stephen D. Burd
Publisher:Cengage Learning