Mitsubishi MELSEC Q Series Reference Manual page 477

The device numbers that can be designated vary depending on the memory cassette
type and the parameter setting of the programmable controller CPU.
(For a more detailed explanation, refer to the operating manual for UTLP-FN1, or the
User's Manual for 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
6 - 44
0
Area of
to
block number 1
8191
8192
Area of block
to
number 2
16383
16384
Area of block
to
number 10
24575
24576
Area of block
to
number 11
32767
32768
Area of block
to
number 12
POINT
(1) The AnA/AnUCPU common commands can be used only when reading and
writing data of blocks numbered 1 to 256 from/to 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 6.4.1.
(3) The head device number designated with the AnA/AnUCPU common
commands is calculated by the following expression.
When designating device numbers m (0 to 8191) of the nth block from the
top:
Head device number = (n - 1)  8192 + m
6 WHEN COMMUNICATING USING THE A COMPATIBLE 1E FRAMES
Block numbers 3 to 9 do not
exist due to insufficient memory size.
6 - 44