PLC TEST 2 | QUESTIONS AND ANSWERS | 2025/2026
UPDATE | 100% CORRECT!!
Define the term data transfer? Answer - Process of exchanging between PLC
memory and/or areas
What is writing over? Answer - When numerical information replaces data that
already exists in a memory location
Define the term data compare Answer - compares data stored in two or more
words and makes decisions based on the program instructions
Define the term mask Answer - Mask is, bits in a word that are used to prevent
other bits in a different word from being used. If there is a 1 in the bit location
of the mask, the correspoinding bit in the output word is enabled and can be
turned on or off
Give an example of how an Allen-Bradley LIM instruction is used Answer - The
limit instruction tests the values within a specific range. If the value is within
the range, the limit is said to be true, and if the limit is not within the range
then the limit is said to be false.
List the four math functions that can be performed by most PLCs Answer - 1.
Addition
2. Subtraction
3.Multiplication
, 4.Division
T or F Data manipulation instructions can be combined with arithmetic (math)
instructions Answer - True
2. Define the term double-integer Answer - Double integer, also known as
DINT is a data type that stores a 32-bit signed integer value
Give an example of how a math function is used in a PLC program. Answer - A
math function can be used to add, subtract, multiply, square root. Can be used
for a variety of math functions, can also use the compute function
What is the function of the clear (CLR) instruction Answer - The Clear function
will clear the value within the word to zero. When the input is true, the value
within the destination will be set to zero.
What does the XPY instruction do Answer - he XPY function is when we need
to put a value to a power of a another value, X to the Power of Y.
List the trigonometric instructions discussed in this chapter Answer - Sin, Cos,
Tan, ASN, ARS, ATN
Define the term word as used in this chapter Answer - Words are locations in
memory that can be used to store different kinds of information. A word
register can store the status of inputs and outputs.
Define the term file as used in this chapter Answer - A file is a group of
consecutive memory words used to store information. Worlds 1 through 5 for
example would make up a consecutive 5-word file.
UPDATE | 100% CORRECT!!
Define the term data transfer? Answer - Process of exchanging between PLC
memory and/or areas
What is writing over? Answer - When numerical information replaces data that
already exists in a memory location
Define the term data compare Answer - compares data stored in two or more
words and makes decisions based on the program instructions
Define the term mask Answer - Mask is, bits in a word that are used to prevent
other bits in a different word from being used. If there is a 1 in the bit location
of the mask, the correspoinding bit in the output word is enabled and can be
turned on or off
Give an example of how an Allen-Bradley LIM instruction is used Answer - The
limit instruction tests the values within a specific range. If the value is within
the range, the limit is said to be true, and if the limit is not within the range
then the limit is said to be false.
List the four math functions that can be performed by most PLCs Answer - 1.
Addition
2. Subtraction
3.Multiplication
, 4.Division
T or F Data manipulation instructions can be combined with arithmetic (math)
instructions Answer - True
2. Define the term double-integer Answer - Double integer, also known as
DINT is a data type that stores a 32-bit signed integer value
Give an example of how a math function is used in a PLC program. Answer - A
math function can be used to add, subtract, multiply, square root. Can be used
for a variety of math functions, can also use the compute function
What is the function of the clear (CLR) instruction Answer - The Clear function
will clear the value within the word to zero. When the input is true, the value
within the destination will be set to zero.
What does the XPY instruction do Answer - he XPY function is when we need
to put a value to a power of a another value, X to the Power of Y.
List the trigonometric instructions discussed in this chapter Answer - Sin, Cos,
Tan, ASN, ARS, ATN
Define the term word as used in this chapter Answer - Words are locations in
memory that can be used to store different kinds of information. A word
register can store the status of inputs and outputs.
Define the term file as used in this chapter Answer - A file is a group of
consecutive memory words used to store information. Worlds 1 through 5 for
example would make up a consecutive 5-word file.
