PROGRAMMABLE LOGIC CONTROLLERS(LL)-PKG.
5th Edition
ISBN: 9781260535044
Author: Petruzella
Publisher: MCG
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Chapter 7, Problem 2RQ
Program Plan Intro
a.
- 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...
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Chapter 7 Solutions
PROGRAMMABLE LOGIC CONTROLLERS(LL)-PKG.
Ch. 7 - Prob. 1RQCh. 7 - Prob. 2RQCh. 7 - Prob. 3RQCh. 7 - Prob. 4RQCh. 7 - a. What are the two methods commonly used to...Ch. 7 - Prob. 6RQCh. 7 - Prob. 7RQCh. 7 - Prob. 8RQCh. 7 - For a TOF timer: a. When is the enable bit of a...Ch. 7 - Explain what each of the following quantities...
Ch. 7 - State the method used to reset the accumulated...Ch. 7 - Study the ladder logic program in Figure 7-40 and...Ch. 7 - Study the ladder logic program in Figure 7-42, and...Ch. 7 - Prob. 6PCh. 7 - Prob. 7PCh. 7 - Prob. 8PCh. 7 - Prob. 9PCh. 7 - Prob. 10PCh. 7 - Prob. 11PCh. 7 - Prob. 13PCh. 7 - When the lights are turned off in a building, an...
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