IW: enter a word.

QW: output words.

Mw: m register word.

SMW: system register word.

LW: temporary register word.

AIW: analog input word.

MWx stands for internal register address, and its data format is word or integer int.

MW0 represents a memory word with an offset address of 0, and MW8 represents a memory word with an offset address of 8.

Siemens PLC system is basically in bytes, so the "standard" offset address with data format of WORD or INTeger int is in steps of 2, such as MW2, MW4, MW6；; (MW 1 is also allowed, but you must ensure that the data address used in the program is not reused).

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