Question 1

The label address must match that of the jump instruction with which it is used.

Accepted Answer

A) True 
 B)False

Question 2

Emergency stop circuits should be hardwired outside of the controller program so that,in the event of total controller failure,independent and rapid shutdown means are available.

Accepted Answer

A) True 
 B)False

Question 3

A latch instruction will automatically unlatch if it is contained within a de-energized MCR zone.

Accepted Answer

A) True 
 B)False

Question 4

The label (LBL) instruction is:

Accepted Answer

A)  always logically true.
B)  has the same address as the jump instruction with which it is used.
C)  is used to identify the ladder rung that is the target destination of the JMP instruction.
D)  all of these.E) B) and C)
F) None of the above

Question 5

Master control reset (MCR)and jump (JMP)are often referred to as override instructions.

Accepted Answer

A) True 
 B)False

Question 6

The immediate I/O instruction is used with critical I/O devices that require updating in advance of the I/O scan.

Accepted Answer

A) True 
 B)False

Question 7

Programming the selectable timed interrupt is done when a section of program needs to be executed on a time basis rather than on an event basis.

Accepted Answer

A) True 
 B)False

Question 8

The use of the immediate I/O instruction increases the total scan time of the program.

Accepted Answer

A) True 
 B)False

Question 9

The fenced zone controlled by the MCR instruction is (are) :

Accepted Answer

A)  rungs No.1 through No.8.
B)  rungs No.3 through No.6.
C)  rungs No.2 and No.6.
D)  rung No.2.E) B) and D)
F) All of the above

Question 10

Each JMP instruction must have a LBL instruction.

Accepted Answer

A) True 
 B)False

Question 11

Assume the processor comes equipped with a normally closed fault relay contact output designed to open when a processor malfunction is detected.This contact would be:

Accepted Answer

A)  programmed as part of the master control reset instruction.
B)  programmed as part of the zone control last state instruction.
C)  hardwired in series with the emergency stop button.
D)  hardwired in parallel with the emergency stop button.E) A) and B)
F) C) and D)

Question 12

You must energize the MCR instruction to activate it.

Accepted Answer

A) True 
 B)False

Question 13

Which of the following PLC instructions would not be classified as an override instruction?

Accepted Answer

A)  Master control reset
B)  Jump-to-subroutine
C)  Output energize
D)  Jump-to-labelE) B) and C)
F) A) and D)

Question 14

Immediate instructions should be used only when:

Accepted Answer

A)  a program must be halted immediately.
B)  a program must be restarted immediately.
C)  the updating of an input or output is critical to your operation.
D)  the resetting of all bits in the data table is critical to your operation.E) A) and D)
F) C) and D)

Question 15

When an MCR zone goes false,off-delay timers within the zone will automatically activate and begin their off delay cycle.

Accepted Answer

A) True 
 B)False

Question 16

The forcing function of a PLC allows the user to turn an external input or output on or off:

Accepted Answer

A)  according to the forced program.
B)  according to the main program.
C)  from the keyboard regardless of its actual status.
D)  all of these.E) B) and D)
F) B) and C)

Question 17

The JMP instruction does not contribute to logic continuity and,for all practical purposes,is always logically true.

Accepted Answer

A) True 
 B)False

Question 18

The ____ is the target for the jump instruction.

Accepted Answer

A)  LBL
B)  TND
C)  IOT
D)  RETE) A) and D)
F) B) and D)

Question 19

The ____ instruction stops the processor from scanning the rest of the program.

Accepted Answer

A)  LBL
B)  IOT
C)  TND
D)  STIE) B) and C)
F) All of the above

Question 20

It is not possible to jump backward in the program.

Accepted Answer

A) True 
 B)False

Exam 9: Program Control Instructions

The ____ instruction stops the processor from scanning the rest of the program.

Correct AnswerverifiedShow Answer

The use of the immediate I/O instruction increases the total scan time of the program.

Correct AnswerverifiedShow Answer

Immediate instructions should be used only when:

Correct AnswerverifiedShow Answer

Master control reset (MCR)and jump (JMP)are often referred to as override instructions.

Correct AnswerverifiedShow Answer

When an MCR zone goes false,off-delay timers within the zone will automatically activate and begin their off delay cycle.

Correct AnswerverifiedShow Answer

A latch instruction will automatically unlatch if it is contained within a de-energized MCR zone.

Correct AnswerverifiedShow Answer

Each JMP instruction must have a LBL instruction.

Correct AnswerverifiedShow Answer

The label address must match that of the jump instruction with which it is used.

Correct AnswerverifiedShow Answer

The label (LBL) instruction is:

Correct AnswerverifiedShow Answer

Emergency stop circuits should be hardwired outside of the controller program so that,in the event of total controller failure,independent and rapid shutdown means are available.

Correct AnswerverifiedShow Answer

You must energize the MCR instruction to activate it.

Correct AnswerverifiedShow Answer

The forcing function of a PLC allows the user to turn an external input or output on or off:

Correct AnswerverifiedShow Answer

Which of the following PLC instructions would not be classified as an override instruction?

Correct AnswerverifiedShow Answer

The fenced zone controlled by the MCR instruction is (are) :

Correct AnswerverifiedShow Answer

Programming the selectable timed interrupt is done when a section of program needs to be executed on a time basis rather than on an event basis.

Correct AnswerverifiedShow Answer

The JMP instruction does not contribute to logic continuity and,for all practical purposes,is always logically true.

Correct AnswerverifiedShow Answer

The immediate I/O instruction is used with critical I/O devices that require updating in advance of the I/O scan.

Correct AnswerverifiedShow Answer

The ____ is the target for the jump instruction.

Correct AnswerverifiedShow Answer

Assume the processor comes equipped with a normally closed fault relay contact output designed to open when a processor malfunction is detected.This contact would be:

Correct AnswerverifiedShow Answer

It is not possible to jump backward in the program.

Correct AnswerverifiedShow Answer

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