PMMI Programmable Logic Controllers (PLC) 1 Practice Test

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How would you perform an addition between two integers in PLC logic, and where is the result stored?

Use ADD instruction and store result in a destination integer variable.

Addition of two integers in PLC logic is done with the ADD instruction. It takes two integer inputs and stores their sum in a destination that is defined as an integer. This is the best approach because it directly performs arithmetic and places the result in a variable you can use later in the program. Using the SUB instruction would perform subtraction instead of addition, even though it can also write to a destination integer. The AND and OR instructions operate on bits or booleans and do not produce a numeric sum, so they wouldn’t give you an integer result for adding two numbers.

Use SUB instruction and store result in a destination integer variable.

Use AND instruction and store result in a destination boolean.

Use OR instruction and store result in a source integer.