Mitsubishi MELSEC Q Series Reference Manual page 230

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3 WHEN COMMUNICATING USING THE QnA COMPATIBLE 3E/3C/4C FRAMES OR 4E FRAME
(m) Data written (write same data function): For QnACPU files
This data section is for the write same data function, and used to write the
same data to the existing QnACPU files.
1) Data communication in ASCII code
The value for one word is converted to a 4-digit (hexadecimal) ASCII
code and sequentially transmitted beginning from the most significant
digit.
2) Data communication in binary code
The value for one word is sequentially transmitted beginning from the
low byte (L: bits 0 to 7).
(n) Size
This value is used to reserve the file area on the designated drive when
registering a new file. It is designated in number of bytes.
1) Data communication in ASCII code
The area size to be reserved for the designated file is expressed as
two words and converted to an 8-digit (hexadecimal) ASCII code and
sequentially transmitted beginning from the most significant digit.
2) Data communication in binary code
The area size to be reserved for the designated file is expressed as
two words and sequentially transmitted beginning from the low byte (L:
bits 0 to 7).
3) An external device can register a new file with the same contents as
the existing file.
The size of the relevant existing file must be checked using the read
file information list function (refer to Section 3.8.5, 3.8.16, and 3.8.17).
(o) Fixed values
1) When data is communicated in ASCII code, "0000" is transmitted.
2) When data is communicated in binary mode, the 2-byte value "0000
is transmitted.
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