Rockwell Automation AutoMax Enhanced Ladder Language Reference Manual - Manual (Page 264)

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12.2.4 Example of an I/O Write Instruction
When switch1 becomes true, the instruction
writes one word of data from the variable pump
to register 300 of the I/O module in slot 4 of the
AutoMax rack.
If you were to use an address instead of a slot
and register location, the example would look
like the instruction below. The Address of
240258H is derived by this formula:
base register address of slot 4 + 2
the register number
Consequently, 240000H + 2(300)=240258H.