PLC PRACTICE TEST QUESTIONS WITH
COMPLETE SOLUTIONS
, A CTU will increment the accumulated value each time the rung goes from true to false,
while a CTD will decrement the accumulated value each time the rung goes from false
to true. - ANSWERFalse
A PLC is controlling a continuous loading application (pick and place) sequence. What
type of signal would be best to activate each step of the sequence? - ANSWERan input
sensor
A hard-wired MCR is used to - ANSWERdisable all outputs for safety
A PLC output will be true when - ANSWERa 1 is placed in the memory location for that
output,
a force is applied to the output,
when all the inputs on the rung are true
Controller (processor) faults cause the majority of PLC problems. - ANSWERFalse
How many projects (i.e. programs) can be running in the PLC at one time? - ANSWER1
If a rung is placed in the program with no inputs and one output, the rung will generate
an error. - ANSWERFalse
If a rung is placed in the program with one input and no outputs, the PLC will generate
an error. - ANSWERTrue
If a tag has the property Local it is ____________ defined - ANSWERmodule
Place the different operations of the PLC in the correct order: - ANSWERExamine
inpiuts, Perform logic, update outputs.
An output address/tag for a single physical terminal location can only be used ONCE in
a program. - ANSWERTrue
One physical input device can be referenced by several different input instructions. -
ANSWERTrue
In an time-driven operation using non-retentive timers, adding more inputs to the
operation will mean adding more timers as well. - ANSWERFalse
In an event-driven sequence, adding more steps means adding more inputs. -
ANSWERTrue
COMPLETE SOLUTIONS
, A CTU will increment the accumulated value each time the rung goes from true to false,
while a CTD will decrement the accumulated value each time the rung goes from false
to true. - ANSWERFalse
A PLC is controlling a continuous loading application (pick and place) sequence. What
type of signal would be best to activate each step of the sequence? - ANSWERan input
sensor
A hard-wired MCR is used to - ANSWERdisable all outputs for safety
A PLC output will be true when - ANSWERa 1 is placed in the memory location for that
output,
a force is applied to the output,
when all the inputs on the rung are true
Controller (processor) faults cause the majority of PLC problems. - ANSWERFalse
How many projects (i.e. programs) can be running in the PLC at one time? - ANSWER1
If a rung is placed in the program with no inputs and one output, the rung will generate
an error. - ANSWERFalse
If a rung is placed in the program with one input and no outputs, the PLC will generate
an error. - ANSWERTrue
If a tag has the property Local it is ____________ defined - ANSWERmodule
Place the different operations of the PLC in the correct order: - ANSWERExamine
inpiuts, Perform logic, update outputs.
An output address/tag for a single physical terminal location can only be used ONCE in
a program. - ANSWERTrue
One physical input device can be referenced by several different input instructions. -
ANSWERTrue
In an time-driven operation using non-retentive timers, adding more inputs to the
operation will mean adding more timers as well. - ANSWERFalse
In an event-driven sequence, adding more steps means adding more inputs. -
ANSWERTrue
