Load, transfer, and move instructions are common instructions in plc programming. It can be used for data transfer and exchange between memories, and instructions are usually executed in bytes, words or double words. The three types of instructions face different objects, and the following differences in roles and functions:
Load: Loads the contents of the memory or specific data into the accumulator or address register:
Transfer: refers to moving the contents of the accumulator or address register to a specified memory;
Mobile: refers to moving the contents of a certain memory or specific data into another memory.
The data loading, transfer and move instructions that can be used in the S7-200/300/400 are different, see table.
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