Title: Chapter #7 Test
Course: Programmable Logic Controls (IC 107-IC 107) > Section: Assessments

Q: A RES (reset) instruction must be used to zero the accumulated value in an RTO timer.
- True
- False
A: True

Q: A timer's delay time equals the value in the ACC multiplied by the time base.
- True
- False
A: False

Q: An alarm is to be switched on whenever a piping system has sustained a cumulative over pressure of 60 sec. The directly applicable timer to use would be the on-delay nonretentive timer.
- True
- False
A: False

Q: For the programmed timer circuit shown, when the switch is initially closed motor(s) ______________ start(s) immediately.
- M1
- M2
- M3
A: M1

Q: For the timer program shown, output B is switched ON when:
- power is applied.
- input A is closed.
- the timer is accumulating time.
- the accumulated value equals the preset value.
A: power is applied.

Q: For the timer relay contact shown, when the relay coil is de-energized, there is a time delay before the contact opens.
- True
- False
A: True

Q: For the timer table shown, bit level addressing is used for:
- EN, TT, PRE, and ACC
- EN, TT, and DN
- PRE, ACC, TT, and EN
- PRE and ACC
A: EN, TT, PRE, and ACC

Q: For the timer circuit shown, the timer accumulated value will reset to zero whenever:
- input A switch is opened.
- input A switch is closed.
- the DN bit is set to 1
- the EN bit is set to 1.
A: input A switch is opened.

Q: The amount of time for which a timer is programmed is called the:
- Preset
- Desired Time
- Set Point
- Lapsed Time
A: Preset

Q: The interconnecting of timers is commonly called:
- grouping.
- programming.
- sequencing.
- cascading.
A: grouping.

Q: The main difference between a TON and TOF timer is that the:
- TON timer can maintain its accumulated time on loss of power or logic continuity.
- TOF timer can maintain its accumulated time on loss of power of logic continuity.
- TOF timer begins timing when logic continuity to the timing rung is lost.
- TON timer begins timing when logic continuity to the timing rung is lost.
A: TON timer can maintain its accumulated time on loss of power or logic continuity.

Q: The on-delay timer (TON) starts timing when the timer's:
- ladder rung switches from false to true.
- ladder rung switches from true to false.
- accumulated value equals its preset value.
- accumulated is greater than its preset value.
A: ladder rung switches from false to true.

Q: The retentive timer reset (RES) instruction is always given the same address as the timer it resets.
- True
- False
A: True

Q: The timer file for SLC500 controller is:
- T1
- T2
- T3
- T4
A: T1

Q: To reset a retentive timer, the:
- ACC time must be greater than the PRE time.
- PRE time must be greater than the ACC time.
- ACC time must equal the PRE time.
A: ACC time must be greater than the PRE time.

Q: When a time-delay period longer than the maximum preset time allowed for a single timer is required, the problem can be solved by programming two or more timers together.
- True
- False
A: True

Q: When addressing an RES instruction, it must be addressed to:
- a TOF instruction.
- a TON instruction.
- any address other than that of the RTO instruction.
- the same address as that of the RTO instruction.
A: a TOF instruction.

Q: When the timing of a device is not reset on a loss of power, the timing is said to be:
- continuous
- holding
- retentive
- saved
A: continuous

Q: Which one of the following timer parameters determines the time duration for the timing circuit?
- Accumulated time.
- Preset time.
- Timer address.
- Time base.
A: Accumulated time.

Q: Which one of the following timer parameters determines the accuracy of the timer?
- Accumulated time.
- Preset time.
- Timer address.
- Time base.
A: Accumulated time.