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

The instruction used to copy the data contained in one tag to another tag is the MOV instruction. This command is specifically designed for transferring data from one location to another within a program. When you use the MOV instruction, it takes the value from the source tag and places it into the destination tag, effectively duplicating the data without altering the original source.

This capability is essential in programmable controller systems as it allows for efficient data management and manipulation. In many programming scenarios, copying data is a frequently performed operation necessary for initializing variables, transferring values between registers, or preparing data for processing.

The other instructions provided serve different functions. For example, the ADD instruction is used for arithmetic addition, MUL for multiplication, and SUB for subtraction. These operations involve mathematical calculations rather than simply moving data from one tag to another. Understanding the specific functionality of each instruction is crucial for effective programming within the programmable controller context.