Mitsubishi MELSEC Q Series Reference Manual page 417

The device numbers that can be designated vary depending on the memory cassette
type and the parameter settings of the programmable controller CPU.
(For more detailed explanations, refer to the operating manual of UTLP-FN1, or the
User's Manual of the programmable controller CPU to be accessed.)
A device number is not assigned to a block number that does not exist in the memory
cassette. As shown below, the device numbers are automatically assigned by skipping
block numbers that do not exist in the memory cassette.
Device number
Designation example 1: Designating R10 of
Designation example 1: Designating R8 of
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0
Area of block
to
number 1
8191
8192
Area of block
to
number 2
16383
16384
Area of block
to
number 10
24575
24576
Area of block
to
number11
32767
32768
Area of block
to
number 12
(b) A device number is designated using 7 characters.
block number 1
0000010
block number 2
0008200
(2-1)  8192+8
Block number Block points
POINT
(1) The AnA/AnUCPU common commands, NR and NW can be used only when
reading and writing data of block numbers 1 to 256 of the extension file
register.
Also, they can be used regardless whether or not the file register parameter is
set.
(2) When accessing the file register (R) set by the parameter or when accessing it
by designating block number, use the commands described in Section 5.3.1.
(3) The head device number designated with the AnA/AnUCPU common
commands, NR and NW, is calculated by the following expression.
(When designating device number m (0 to 8191) of block number n (the nth
block from the top; "n" must be no smaller than 1))
Head device number = (n - 1)  8192 + m
5 WHEN COMMUNICATING USING THE A COMPATIBLE 1C FRAMES
Block numbers 3 to 9 do not exist
due to insufficient memory size.
"0" in the first digits (for example,
the leading three digits indicated
in 0008200) can be designated
by spaces (20 ).
H
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