Which operation accompanies addition among common functions in PLC programming?

In PLC programming, addition is often accompanied by subtraction as one of the fundamental arithmetic operations. Both addition and subtraction are basic functions used to manipulate numerical values in control processes. They serve as complementary operations, where addition is used to increase a value, while subtraction decreases it.

In many control scenarios, after a value is added to a process variable or setpoint, it may be necessary to subtract to adjust for feedback or to calculate differences, making subtraction a crucial operation in control logic. This relationship is observed in various applications, such as PID controllers, where an error signal is calculated which may involve both addition and subtraction to maintain the desired setpoint.

The other operations—multiplication, division, and remainder—while also important in specific calculations, do not accompany addition in the same fundamental way as subtraction does in standard PLC programming tasks.