Deck 10: Program Control Instructions

Question 1

The jump instruction (JMP) tells the processor to jump over a portion of the program.

Answer 1

True

Question 2

Describe the purpose of the temporary end instruction (TND).

Answer 2

The temporary end instruction (TND) is used to place a temporary end to the routine.

Question 3

The ____________________ is also used when debugging a new or modified program.

Answer 3

always false instruction (AFI),always false instruction,AFI

Question 4

What can happen when jumping backward an excessive number of times?

Question 5

An MCR zone can be nested within another MCR zone.

Question 6

Jumping backward does not add to the total scan time.

Question 7

When an MCR instruction has been programmed with no logic element preceding the instruction, it is said to be programmed _____________________.

Question 8

MCRs are often used with circuits that have off-delay timers so the circuit can be shut down completely without waiting for the timers to time out.

Question 9

When is the one-shot instruction used?

Question 10

In standard relay control systems, a(n) ____________________ control is often used to control power to the entire circuit or just to selected rungs.

Question 11

The one-shot instruction (ONS) is an input instruction that makes the rung true for just one program scan, based on a false-to-true transition of the instruction that precedes the one-shot instruction.

Question 12

What happens if the MCR instruction is false?

Question 13

____________________ instructions will remain ON, or true, even when the MCR instruction is false.

Question 14

MCRs are sometimes called Master Control ____________________ because they reset the output to zero or OFF.

Question 15

What happens when the MCR instruction is true?