Which of the following is a common function in PLC programming?

In PLC programming, a common function is addition. Arithmetic operations are essential for various control processes, and addition is frequently used to perform calculations related to inputs and outputs, data manipulation, and setting parameters within a control program. For instance, when adjusting timers or counters or tracking totals in production lines, the addition function allows programmers to sum values as needed for operational decisions.

Although other functions like bitwise XOR, looping, and branching may play important roles in specific contexts—such as manipulating bits, creating iterative processes, or controlling the flow of the program—addition is foundational in programming languages used in PLCs. This arithmetic function applies directly to logical operations that are often crucial for process automation, making it a primary function in PLC programming.