Deck 24: Programmable Logic Controllers

Question 1

The Function Block Diagram is a ____ language.

A) graphic
B) text-based
C) BASIC style
D) C++ style

Answer 1

A

Question 2

Instruction List (IL) is a low-level program best suited for small applications and fast execution.

Answer 2

True

Question 3

Which PLC language is a BASIC style language?

A) Sequential Function Chart
B) Structured Text
C) Ladder Diagram
D) Instruction List

Answer 3

B

Question 4

Most PLCs consist of an assortment of modules (input and output), a CPU, a power supply, and a rack in which to mount the modules.

Question 5

The five programming languages for PLCs are Ladder Diagram, Function Block Diagram, Instruction List, Sequential Function Chart, and Structured Graphic.

Question 6

Digital input modules are available for DC inputs, AC inputs, or a mix.

Question 7

___ coil is a nonretentive coil used to perform a latch function.

A) SET
B) RESET
C) LET
D) TLC

Question 8

____ timers will retain their timed value during a loss of power.

A) Retentive
B) Nonretentive
C) On-delay
D) Off-delay

Question 9

A(n) ____ output module will produce output signals that are either 0 to 10 VDC or 4 to 20 milliamperes.

A) analog
B) digital
C) differential
D) variable

Question 10

One big advantage of using point-to-point wiring of relay controls over a PLC is that the wiring is greatly simplified and reduced.

Question 11

____ coils revert to their de-energized state whenever the PLC is cycled from stop to run or whenever the power is cycled.

A) Retentive
B) Nonretentive
C) Negative
D) Open

Question 12

One example of a program control instruction is _____.

A) LOG
B) SUB
C) TMR
D) ENDMCR

Question 13

____ timers perform a timing function while receiving power. The state of the associated contact(s) does not change until the timer has timed out.

A) Coil
B) Off-Delay
C) On-delay
D) End

Question 14

Down-counters perform a counting function when the associated input element transitions from a(n) ____ to a(n) ____ state.

A) on; off
B) off; on
C) on; reset
D) off; reset

Question 15

A PLC will treat all input and output sources the same; they will be looked upon as a ____.

A) signal
B) voltage source
C) resistance
D) load