Which instruction is used to copy data from one tag to another?

The instruction used to copy data from one tag to another is the MOV instruction. This command is specifically designed for moving data between different memory locations, which includes transferring values from one variable (or tag) to another without altering the data being moved.

In programmable logic controllers (PLCs) and other programmable systems, MOV behavior is essential for data management and manipulation, allowing for the efficient organization of data by duplicating values when necessary. When you execute the MOV instruction, it takes the value from the source tag and replicates it in the destination tag, making it a fundamental operation in any programming or automation task that involves handling variables.

This functionality is critical for applications where the state of one variable needs to be reflected in another variable, ensuring that data flows smoothly within the logic of control systems.