Q1 Choose the correcet answer for each of the following: 1. The off-delay timer (TOF) starts timing when the timer's: a) ladder rung switches from false to true. b) ladder rung switches from true to false. c) accumulated value equals its preset value. d) accumulated is greater than its preset value. 2. The operation of a PLC retentive timer is similar to that of an: a) electromagnetic pneumatic timer. b) electromechanical motor-driven timer. d) on-delay timer. c) off-delay timer.
Q1 Choose the correcet answer for each of the following: 1. The off-delay timer (TOF) starts timing when the timer's: a) ladder rung switches from false to true. b) ladder rung switches from true to false. c) accumulated value equals its preset value. d) accumulated is greater than its preset value. 2. The operation of a PLC retentive timer is similar to that of an: a) electromagnetic pneumatic timer. b) electromechanical motor-driven timer. d) on-delay timer. c) off-delay timer.
Introductory Circuit Analysis (13th Edition)
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Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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
Transcribed Image Text:Choose the correct answer for each of the following:
1. The off-delay timer (TOF) starts timing when the timer's:
a) ladder rung switches from false to true.
b) ladder rung switches from true to false.
c) accumulated value equals its preset value.
d) accumulated is greater than its preset value.
2. The operation of a PLC retentive timer is similar to that of an:
c) off-delay timer.
a) electromagnetic pneumatic timer.
b) electromechanical motor-driven timer. d) on-delay timer.
3. Which one of the following timer parameters determines the time duration for the timing circuit?
a) Accumulated time
b) Preset time
c) Timer address
d) Time base
4. The main difference between a TON and TOF timer is that the:
a) TON timer can maintain its accumulated time on loss of power or logic continuity.
b) TOF timer can maintain its accumulated time on loss of power or logic continuity.
e) TOF timer begins timing when logic continuity to the timing rung is lost.
d) TON timer begins timing when logic continuity to the timing rung is lost.
L2
S1
(TD
Figure I
L1
TD1
5 s
5. In the hardwired circuit of Figure 1, the light will stay on:
a) as long as S1 is closed.
b) for 5 s after coil TD is energized. d) both a and e
c) for 5 s after coil TD is de-energized.
6. Which one of the following timer parameters determines the accuracy of the timer?
c) Timer address
d) Time base
a) Accumulated time
b) Preset time
al
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