Which instruction is used to copy the data contained in one tag to another tag?

The instruction used to copy the data from one tag to another is the MOV instruction. In programmable logic controllers (PLCs) and many programming environments, MOV stands for "move" and is explicitly designed for transferring data between memory locations or tags. When you use the MOV instruction, it takes the value from the source tag and assigns it to the destination tag, effectively duplicating the data.

This operation is fundamental in programming as it allows for data manipulation and is widely utilized for tasks like setting values, updating states, and preparing data for further processing. Understanding how to effectively use the MOV instruction enhances programming efficiency and ensures that data management within control systems is accurate and reliable.